Commit Graph

425858 Commits

Author SHA1 Message Date
Jason Low
1d8fe7dc80 locking/mutexes: Unlock the mutex without the wait_lock
When running workloads that have high contention in mutexes on an 8 socket
machine, mutex spinners would often spin for a long time with no lock owner.

The main reason why this is occuring is in __mutex_unlock_common_slowpath(),
if __mutex_slowpath_needs_to_unlock(), then the owner needs to acquire the
mutex->wait_lock before releasing the mutex (setting lock->count to 1). When
the wait_lock is contended, this delays the mutex from being released.
We should be able to release the mutex without holding the wait_lock.

Signed-off-by: Jason Low <jason.low2@hp.com>
Cc: chegu_vinod@hp.com
Cc: paulmck@linux.vnet.ibm.com
Cc: Waiman.Long@hp.com
Cc: torvalds@linux-foundation.org
Cc: tglx@linutronix.de
Cc: riel@redhat.com
Cc: akpm@linux-foundation.org
Cc: davidlohr@hp.com
Cc: hpa@zytor.com
Cc: andi@firstfloor.org
Cc: aswin@hp.com
Cc: scott.norton@hp.com
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1390936396-3962-4-git-send-email-jason.low2@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-03-11 12:14:54 +01:00
Jason Low
47667fa150 locking/mutexes: Modify the way optimistic spinners are queued
The mutex->spin_mlock was introduced in order to ensure that only 1 thread
spins for lock acquisition at a time to reduce cache line contention. When
lock->owner is NULL and the lock->count is still not 1, the spinner(s) will
continually release and obtain the lock->spin_mlock. This can generate
quite a bit of overhead/contention, and also might just delay the spinner
from getting the lock.

This patch modifies the way optimistic spinners are queued by queuing before
entering the optimistic spinning loop as oppose to acquiring before every
call to mutex_spin_on_owner(). So in situations where the spinner requires
a few extra spins before obtaining the lock, then there will only be 1 spinner
trying to get the lock and it will avoid the overhead from unnecessarily
unlocking and locking the spin_mlock.

Signed-off-by: Jason Low <jason.low2@hp.com>
Cc: tglx@linutronix.de
Cc: riel@redhat.com
Cc: akpm@linux-foundation.org
Cc: davidlohr@hp.com
Cc: hpa@zytor.com
Cc: andi@firstfloor.org
Cc: aswin@hp.com
Cc: scott.norton@hp.com
Cc: chegu_vinod@hp.com
Cc: Waiman.Long@hp.com
Cc: paulmck@linux.vnet.ibm.com
Cc: torvalds@linux-foundation.org
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1390936396-3962-3-git-send-email-jason.low2@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-03-11 12:14:53 +01:00
Jason Low
46af29e479 locking/mutexes: Return false if task need_resched() in mutex_can_spin_on_owner()
The mutex_can_spin_on_owner() function should also return false if the
task needs to be rescheduled to avoid entering the MCS queue when it
needs to reschedule.

Signed-off-by: Jason Low <jason.low2@hp.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman.Long@hp.com
Cc: torvalds@linux-foundation.org
Cc: tglx@linutronix.de
Cc: riel@redhat.com
Cc: akpm@linux-foundation.org
Cc: davidlohr@hp.com
Cc: hpa@zytor.com
Cc: andi@firstfloor.org
Cc: aswin@hp.com
Cc: scott.norton@hp.com
Cc: chegu_vinod@hp.com
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1390936396-3962-2-git-send-email-jason.low2@hp.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-03-11 12:14:52 +01:00
Peter Zijlstra
c9122da1e2 locking: Move mcs_spinlock.h into kernel/locking/
The mcs_spinlock code is not meant (or suitable) as a generic locking
primitive, therefore take it away from the normal includes and place
it in kernel/locking/.

This way the locking primitives implemented there can use it as part
of their implementation but we do not risk it getting used
inapropriately.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-byirmpamgr7h25m5kyavwpzx@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-03-11 12:14:52 +01:00
Finn Thain
e571c58f31 m68k: Skip futex_atomic_cmpxchg_inatomic() test
Skip the futex_atomic_cmpxchg_inatomic() test in futex_init(). It causes a 
fatal exception on 68030 (and presumably 68020 also).

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: http://lkml.kernel.org/r/alpine.LNX.2.00.1403061006440.5525@nippy.intranet
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2014-03-06 11:35:17 +01:00
Heiko Carstens
03b8c7b623 futex: Allow architectures to skip futex_atomic_cmpxchg_inatomic() test
If an architecture has futex_atomic_cmpxchg_inatomic() implemented and there
is no runtime check necessary, allow to skip the test within futex_init().

This allows to get rid of some code which would always give the same result,
and also allows the compiler to optimize a couple of if statements away.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Finn Thain <fthain@telegraphics.com.au>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Link: http://lkml.kernel.org/r/20140302120947.GA3641@osiris
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2014-03-03 11:32:08 +01:00
Ingo Molnar
d2ae2e525e Merge branch 'core/urgent' into core/locking
It's not really a regression fix, so move it to the v3.15 queue.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-27 13:06:55 +01:00
Ingo Molnar
f207dbe63c Revert "sched/wait: Suppress Sparse 'variable shadowing' warning"
This reverts commit 980f88e414.

This warning is actually useful, don't suppress it.

We actually rely on the shadowing for ___wait_cond_timeout().

We further used the __ret variable in __wait_event_timeout()'s cmd
argument: __ret = schedule_timeout(__ret). That now explicitly uses the
wrong __ret.

Reported-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Requested-by: Andrew Morton <akpm@linux-foundation.org>
Requested-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-Q5blhuqqzwgVwvjf1gszrdol@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-27 12:20:31 +01:00
Oleg Nesterov
47be1c1a0e lockdep: Change lockdep_set_novalidate_class() to use _and_name
Cosmetic. This doesn't really matter because a) device->mutex is
the only user of __lockdep_no_validate__ and b) this class should
be never reported as the source of problem, but if something goes
wrong "&dev->mutex" looks better than "&__lockdep_no_validate__"
as the name of the lock.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140120182016.GA26512@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-09 21:19:01 +01:00
Oleg Nesterov
34d0ed5ea7 lockdep: Change mark_held_locks() to check hlock->check instead of lockdep_no_validate
The __lockdep_no_validate check in mark_held_locks() adds the subtle
and (afaics) unnecessary difference between no-validate and check==0.
And this looks even more inconsistent because __lock_acquire() skips
mark_irqflags()->mark_lock() if !check.

Change mark_held_locks() to check hlock->check instead.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140120182013.GA26505@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-09 21:18:59 +01:00
Oleg Nesterov
1b5ff816ca lockdep: Don't create the wrong dependency on hlock->check == 0
Test-case:

	DEFINE_MUTEX(m1);
	DEFINE_MUTEX(m2);
	DEFINE_MUTEX(mx);

	void lockdep_should_complain(void)
	{
		lockdep_set_novalidate_class(&mx);

		// m1 -> mx -> m2
		mutex_lock(&m1);
		mutex_lock(&mx);
		mutex_lock(&m2);
		mutex_unlock(&m2);
		mutex_unlock(&mx);
		mutex_unlock(&m1);

		// m2 -> m1 ; should trigger the warning
		mutex_lock(&m2);
		mutex_lock(&m1);
		mutex_unlock(&m1);
		mutex_unlock(&m2);
	}

this doesn't trigger any warning, lockdep can't detect the trivial
deadlock.

This is because lock(&mx) correctly avoids m1 -> mx dependency, it
skips validate_chain() due to mx->check == 0. But lock(&m2) wrongly
adds mx -> m2 and thus m1 -> m2 is not created.

rcu_lock_acquire()->lock_acquire(check => 0) is fine due to read == 2,
so currently only __lockdep_no_validate__ can trigger this problem.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140120182010.GA26498@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-09 21:18:57 +01:00
Oleg Nesterov
fb9edbe984 lockdep: Make held_lock->check and "int check" argument bool
The "int check" argument of lock_acquire() and held_lock->check are
misleading. This is actually a boolean: 2 means "true", everything
else is "false".

And there is no need to pass 1 or 0 to lock_acquire() depending on
CONFIG_PROVE_LOCKING, __lock_acquire() checks prove_locking at the
start and clears "check" if !CONFIG_PROVE_LOCKING.

Note: probably we can simply kill this member/arg. The only explicit
user of check => 0 is rcu_lock_acquire(), perhaps we can change it to
use lock_acquire(trylock =>, read => 2). __lockdep_no_validate means
check => 0 implicitly, but we can change validate_chain() to check
hlock->instance->key instead. Not to mention it would be nice to get
rid of lockdep_set_novalidate_class().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140120182006.GA26495@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-09 21:18:54 +01:00
Tim Chen
ddf1d169c0 locking/mcs: Allow architecture specific asm files to be used for contended case
This patch allows each architecture to add its specific assembly optimized
arch_mcs_spin_lock_contended and arch_mcs_spinlock_uncontended for
MCS lock and unlock functions.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Scott J Norton <scott.norton@hp.com>
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: AswinChandramouleeswaran <aswin@hp.com>
Cc: George Spelvin <linux@horizon.com>
Cc: Rik vanRiel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: MichelLespinasse <walken@google.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Alex Shi <alex.shi@linaro.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Figo.zhang" <figo1802@gmail.com>
Cc: "Paul E.McKenney" <paulmck@linux.vnet.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Waiman Long <waiman.long@hp.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthew R Wilcox <matthew.r.wilcox@intel.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1390347382.3138.67.camel@schen9-DESK
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-09 21:18:52 +01:00
Tim Chen
b119fa61d4 locking/mcs: Order the header files in Kbuild of each architecture in alphabetical order
We perform a clean up of the Kbuid files in each architecture.
We order the files in each Kbuild in alphabetical order
by running the below script.

for i in arch/*/include/asm/Kbuild
do
        cat $i | gawk '/^generic-y/ {
                i = 3;
                do {
                        for (; i <= NF; i++) {
                                if ($i == "\\") {
                                        getline;
                                        i = 1;
                                        continue;
                                }
                                if ($i != "")
                                        hdr[$i] = $i;
                        }
                        break;
                } while (1);
                next;
        }
        // {
                print $0;
        }
        END {
                n = asort(hdr);
                for (i = 1; i <= n; i++)
                        print "generic-y += " hdr[i];
        }' > ${i}.sorted;
        mv ${i}.sorted $i;
done

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Matthew R Wilcox <matthew.r.wilcox@intel.com>
Cc: AswinChandramouleeswaran <aswin@hp.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: "Paul E.McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Scott J Norton <scott.norton@hp.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: "Figo.zhang" <figo1802@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Waiman Long <waiman.long@hp.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Alex Shi <alex.shi@linaro.org>
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: George Spelvin <linux@horizon.com>
Cc: MichelLespinasse <walken@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
[ Fixed build bug. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-09 21:17:50 +01:00
Johannes Berg
980f88e414 sched/wait: Suppress Sparse 'variable shadowing' warning
This warning seems to show up a lot now, since ___wait_event()
is (indirectly) used inside wait_event_timeout(), which also
has a variable called __ret. Rename the one in ___wait_event()
to ___ret (another leading underscore) to suppress the warning.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1391704121.12789.20.camel@jlt4.sipsolutions.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-09 13:11:49 +01:00
Ingo Molnar
65370bdf88 Merge branch 'linus' into core/locking
Refresh the topic.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-02-02 09:43:20 +01:00
Linus Torvalds
5cb480f6b4 Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
Pull misc kbuild changes from Michal Marek:
 "The non-critical part of kbuild is small this time:
   - Three fixes for make deb-pkg
   - A new coccinelle check

  One of the deb-pkg fixes is a leftover from the last merge window,
  hence the merge commit"

* 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  deb-pkg: Fix building for MIPS big-endian or ARM OABI
  deb-pkg: Fix cross-building linux-headers package
  scripts: Coccinelle script for pm_runtime_* return checks with IS_ERR_VALUE
  deb-pkg: Inhibit initramfs builders if CONFIG_BLK_DEV_INITRD is not set
2014-02-01 11:03:16 -08:00
Pali Rohár
1bda2ac071 afs: proc cells and rootcell are writeable
Both proc files are writeable and used for configuring cells. But
there is missing correct mode flag for writeable files. Without
this patch both proc files are read only.

[ It turns out they aren't really read-only, since root can write to
  them even if the write bit isn't set due to CAP_DAC_OVERRIDE ]

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-02-01 10:59:39 -08:00
Heiko Carstens
5a5e75f471 tile: remove compat_sys_lookup_dcookie declaration to fix compile error
With commit d8d14bd09c ("fs/compat: fix lookup_dcookie() parameter
handling") I changed the type of the len parameter of the
lookup_dcookie() syscall.

However I missed that there was still a stale declaration in
arch/tile/..  which now causes a compile error on tile:

  In file included from fs/dcookies.c:28:0:
  include/linux/compat.h:425:17: error: conflicting types for 'compat_sys_lookup_dcookie'
  fs/dcookies.c:207:1: error: conflicting types for 'compat_sys_lookup_dcookie'

Simply remove the declaration in the tile architecture, which is only a
leftover from before the different compat lookup_dcookie() versions have
been merged.  The correct declaration is now in include/linux/compat.h

The build error was reported by Fenguang's build bot.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-02-01 10:55:15 -08:00
Linus Torvalds
0f44bc36ba Merge branch 'for-linus' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French:
 "A set of cifs fixes (mostly for symlinks, and SMB2 xattrs) and
  cleanups"

* 'for-linus' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Fix check for regular file in couldbe_mf_symlink()
  [CIFS] Fix SMB2 mounts so they don't try to set or get xattrs via cifs
  CIFS: Cleanup cifs open codepath
  CIFS: Remove extra indentation in cifs_sfu_type
  CIFS: Cleanup cifs_mknod
  CIFS: Cleanup CIFSSMBOpen
  cifs: Add support for follow_link on dfs shares under posix extensions
  cifs: move unix extension call to cifs_query_symlink()
  cifs: Re-order M-F Symlink code
  cifs: Add create MFSymlinks to protocol ops struct
  cifs: use protocol specific call for query_mf_symlink()
  cifs: Rename MF symlink function names
  cifs: Rename and cleanup open_query_close_cifs_symlink()
  cifs: Fix memory leak in cifs_hardlink()
2014-02-01 10:52:45 -08:00
Linus Torvalds
efc518eb31 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs fixes from Al Viro:
 "Several obvious fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  Fix mountpoint reference leakage in linkat
  hfsplus: use xattr handlers for removexattr
  Typo in compat_sys_lseek() declaration
  fs/super.c: sync ro remount after blocking writers
  vfs: unexport the getname() symbol
2014-02-01 10:43:45 -08:00
Linus Torvalds
fea8893da7 Staging wireless driver for 3.14-rc1
Here's a single staging driver for a wireless chipset that has shown up
 in the SteamBox hardware.  It is merged separately from the "main"
 staging pull request to sync up with the wireless api changes that came
 in from the networking tree.
 
 It's self-contained and works for me and others.  Larry will be
 replacing it with a "real" driver for 3.15, but for now this one is
 needed.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'staging-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull rtl8812ae staging wireless driver from Greg KH:
 "Here's a single staging driver for a wireless chipset that has shown
  up in the SteamBox hardware.  It is merged separately from the "main"
  staging pull request to sync up with the wireless api changes that
  came in from the networking tree.

  It's self-contained and works for me and others.  Larry will be
  replacing it with a "real" driver for 3.15, but for now this one is
  needed"

* tag 'staging-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
  staging: r8821ae: Enable build by reverting BROKEN marking
  staging: r8821ae: Fix build problems
  Staging: rtl8812ae: disable due to build errors
  Staging: rtl8821ae: add TODO file
  Staging: rtl8821ae: removed unused functions and variables
  Staging: rtl8821ae: rc.c: fix up function prototypes
  Staging: rtl8812ae: Add Realtek 8821 PCI WIFI driver
2014-02-01 10:29:59 -08:00
Rafael J. Wysocki
04480094de Revert "PCI: Remove from bus_list and release resources in pci_release_dev()"
Revert commit ef83b0781a "PCI: Remove from bus_list and release
resources in pci_release_dev()" that made some nasty race conditions
become possible.  For example, if a Thunderbolt link is unplugged
and then replugged immediately, the pci_release_dev() resulting from
the hot-remove code path may be racing with the hot-add code path
which after that commit causes various kinds of breakage to happen
(up to and including a hard crash of the whole system).

Moreover, the problem that commit ef83b0781a attempted to address
cannot happen any more after commit 8a4c5c329d "PCI: Check parent
kobject in pci_destroy_dev()", because pci_destroy_dev() will now
return immediately if it has already been executed for the given
device.

Note, however, that the invocation of msi_remove_pci_irq_vectors()
removed by commit ef83b0781a from pci_free_resources() along with
the other changes made by it is not added back because of subsequent
code changes depending on that modification.

Fixes: ef83b0781a (PCI: Remove from bus_list and release resources in pci_release_dev())
Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-02-01 10:24:31 -08:00
Linus Torvalds
8a1f006ad3 NFS client bugfixes for Linux 3.14
Highlights:
 
 - Fix several races in nfs_revalidate_mapping
 - NFSv4.1 slot leakage in the pNFS files driver
 - Stable fix for a slot leak in nfs40_sequence_done
 - Don't reject NFSv4 servers that support ACLs with only ALLOW aces
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Merge tag 'nfs-for-3.14-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client bugfixes from Trond Myklebust:
 "Highlights:

   - Fix several races in nfs_revalidate_mapping
   - NFSv4.1 slot leakage in the pNFS files driver
   - Stable fix for a slot leak in nfs40_sequence_done
   - Don't reject NFSv4 servers that support ACLs with only ALLOW aces"

* tag 'nfs-for-3.14-2' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  nfs: initialize the ACL support bits to zero.
  NFSv4.1: Cleanup
  NFSv4.1: Clean up nfs41_sequence_done
  NFSv4: Fix a slot leak in nfs40_sequence_done
  NFSv4.1 free slot before resending I/O to MDS
  nfs: add memory barriers around NFS_INO_INVALID_DATA and NFS_INO_INVALIDATING
  NFS: Fix races in nfs_revalidate_mapping
  sunrpc: turn warn_gssd() log message into a dprintk()
  NFS: fix the handling of NFS_INO_INVALID_DATA flag in nfs_revalidate_mapping
  nfs: handle servers that support only ALLOW ACE type.
2014-01-31 15:39:07 -08:00
Linus Torvalds
14864a52cd sound fixes for 3.14-rc1
The big chunks here are the updates for oxygen driver for Xonar DG
 devices, which were slipped from the previous pull request.  They are
 device-specific and thus not too dangerous.
 
 Other than that, all patches are small bug fixes, mainly for Samsung
 build fixes, a few HD-audio enhancements, and other misc ASoC fixes.
 (And this time ASoC merge is less than Octopus, lucky seven :)
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Merge tag 'sound-fix-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "The big chunks here are the updates for oxygen driver for Xonar DG
  devices, which were slipped from the previous pull request.  They are
  device-specific and thus not too dangerous.

  Other than that, all patches are small bug fixes, mainly for Samsung
  build fixes, a few HD-audio enhancements, and other misc ASoC fixes.
  (And this time ASoC merge is less than Octopus, lucky seven :)"

* tag 'sound-fix-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: (42 commits)
  ALSA: hda/hdmi - allow PIN_OUT to be dynamically enabled
  ALSA: hda - add headset mic detect quirks for another Dell laptop
  ALSA: oxygen: Xonar DG(X): cleanup and minor changes
  ALSA: oxygen: Xonar DG(X): modify high-pass filter control
  ALSA: oxygen: Xonar DG(X): modify input select functions
  ALSA: oxygen: Xonar DG(X): modify capture volume functions
  ALSA: oxygen: Xonar DG(X): use headphone volume control
  ALSA: oxygen: Xonar DG(X): modify playback output select
  ALSA: oxygen: Xonar DG(X): capture from I2S channel 1, not 2
  ALSA: oxygen: Xonar DG(X): move the mixer code into another file
  ALSA: oxygen: modify CS4245 register dumping function
  ALSA: oxygen: modify adjust_dg_dac_routing function
  ALSA: oxygen: Xonar DG(X): modify DAC/ADC parameters function
  ALSA: oxygen: Xonar DG(X): modify initialization functions
  ALSA: oxygen: Xonar DG(X): add new CS4245 SPI functions
  ALSA: oxygen: additional definitions for the Xonar DG/DGX card
  ALSA: oxygen: change description of the xonar_dg.c file
  ALSA: oxygen: export oxygen_update_dac_routing symbol
  ALSA: oxygen: add mute mask for the OXYGEN_PLAY_ROUTING register
  ALSA: oxygen: modify the SPI writing function
  ...
2014-01-31 15:38:09 -08:00
Linus Torvalds
4e13c5d021 Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
Pull SCSI target updates from Nicholas Bellinger:
 "The highlights this round include:

  - add support for SCSI Referrals (Hannes)
  - add support for T10 DIF into target core (nab + mkp)
  - add support for T10 DIF emulation in FILEIO + RAMDISK backends (Sagi + nab)
  - add support for T10 DIF -> bio_integrity passthrough in IBLOCK backend (nab)
  - prep changes to iser-target for >= v3.15 T10 DIF support (Sagi)
  - add support for qla2xxx N_Port ID Virtualization - NPIV (Saurav + Quinn)
  - allow percpu_ida_alloc() to receive task state bitmask (Kent)
  - fix >= v3.12 iscsi-target session reset hung task regression (nab)
  - fix >= v3.13 percpu_ref se_lun->lun_ref_active race (nab)
  - fix a long-standing network portal creation race (Andy)"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (51 commits)
  target: Fix percpu_ref_put race in transport_lun_remove_cmd
  target/iscsi: Fix network portal creation race
  target: Report bad sector in sense data for DIF errors
  iscsi-target: Convert gfp_t parameter to task state bitmask
  iscsi-target: Fix connection reset hang with percpu_ida_alloc
  percpu_ida: Make percpu_ida_alloc + callers accept task state bitmask
  iscsi-target: Pre-allocate more tags to avoid ack starvation
  qla2xxx: Configure NPIV fc_vport via tcm_qla2xxx_npiv_make_lport
  qla2xxx: Enhancements to enable NPIV support for QLOGIC ISPs with TCM/LIO.
  qla2xxx: Fix scsi_host leak on qlt_lport_register callback failure
  IB/isert: pass scatterlist instead of cmd to fast_reg_mr routine
  IB/isert: Move fastreg descriptor creation to a function
  IB/isert: Avoid frwr notation, user fastreg
  IB/isert: seperate connection protection domains and dma MRs
  tcm_loop: Enable DIF/DIX modes in SCSI host LLD
  target/rd: Add DIF protection into rd_execute_rw
  target/rd: Add support for protection SGL setup + release
  target/rd: Refactor rd_build_device_space + rd_release_device_space
  target/file: Add DIF protection support to fd_execute_rw
  target/file: Add DIF protection init/format support
  ...
2014-01-31 15:31:23 -08:00
Oleg Drokin
d22e6338db Fix mountpoint reference leakage in linkat
Recent changes to retry on ESTALE in linkat
(commit 442e31ca5a)
introduced a mountpoint reference leak and a small memory
leak in case a filesystem link operation returns ESTALE
which is pretty normal for distributed filesystems like
lustre, nfs and so on.
Free old_path in such a case.

[AV: there was another missing path_put() nearby - on the previous
goto retry]

Signed-off-by: Oleg Drokin: <green@linuxhacker.ru>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-01-31 17:33:13 -05:00
Linus Torvalds
deb2a1d29b - Build fix with DMA_CMA enabled
- Introduction of PTE_WRITE to distinguish between writable but clean
   and truly read-only pages
 - FIQs enabling/disabling clean-up (they aren't used on arm64)
 - CPU resume fix for the per-cpu offset restoring
 - Code comment typos
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pyll ARM64 patches from Catalin Marinas:
 - Build fix with DMA_CMA enabled
 - Introduction of PTE_WRITE to distinguish between writable but clean
   and truly read-only pages
 - FIQs enabling/disabling clean-up (they aren't used on arm64)
 - CPU resume fix for the per-cpu offset restoring
 - Code comment typos

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: mm: Introduce PTE_WRITE
  arm64: mm: Remove PTE_BIT_FUNC macro
  arm64: FIQs are unused
  arm64: mm: fix the function name in comment of cpu_do_switch_mm
  arm64: fix build error if DMA_CMA is enabled
  arm64: kernel: fix per-cpu offset restore on resume
  arm64: mm: fix the function name in comment of __flush_dcache_area
  arm64: mm: use ubfm for dcache_line_size
2014-01-31 14:25:52 -08:00
Linus Torvalds
bcc9f96681 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha
Pull alpha updates from Matt Turner:
 "A pair of changes for alpha.  One fixes a networking regression, and
  the second adds audit syscall support which will help in supporting
  systemd"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha:
  alpha: fix broken network checksum
  alpha: Enable system-call auditing support.
2014-01-31 14:24:56 -08:00
Christoph Hellwig
b168fff721 hfsplus: use xattr handlers for removexattr
hfsplus was already using the handlers for get and set operations,
and with the removal of can_set_xattr we've now allow operations that
wouldn't otherwise be allowed.

With this we can also centralize the special-casing of the osx.
attrs that don't have prefixes on disk in the osx xattr handlers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-01-31 14:44:39 -05:00
Stephan Springl
e5fbf67dab Typo in compat_sys_lseek() declaration
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-01-31 14:32:24 -05:00
Andrew Ruder
807612db2f fs/super.c: sync ro remount after blocking writers
Move sync_filesystem() after sb_prepare_remount_readonly().  If writers
sneak in anywhere from sync_filesystem() to sb_prepare_remount_readonly()
it can cause inodes to be dirtied and writeback to occur well after
sys_mount() has completely successfully.

This was spotted by corrupted ubifs filesystems on reboot, but appears
that it can cause issues with any filesystem using writeback.

Cc: Artem Bityutskiy <dedekind1@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
CC: Richard Weinberger <richard@nod.at>
Co-authored-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Ruder <andrew.ruder@elecsyscorp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-01-31 14:29:36 -05:00
Jeff Layton
9115eac2c7 vfs: unexport the getname() symbol
Leaving getname() exported when putname() isn't is a bad idea.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-01-31 14:28:56 -05:00
Linus Torvalds
b399c46ea0 Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media updates from Mauro Carvalho Chehab:
 - a new jpeg codec driver for Samsung Exynos (jpeg-hw-exynos4)
 - a new dvb frontend for ds2103 chipset (m88ds2103)
 - a new sensor driver for Samsung S5K5BAF UXGA (s5k5baf)
 - new drivers for R-Car VSP1
 - a new radio driver: radio-raremono
 - a new tuner driver for ts2022 chipset (m88ts2022)
 - the analog part of em28xx is now a separate module that only
   load/runs if the device is not a pure digital TV device
 - added a staging driver for bcm2048 radio devices
 - the omap 2 video driver (omap24xx) was moved to staging.  This driver
   is for an old hardware and uses a deprecated Kernel internal API.  If
   nobody cares enough to fix it, it would be removed on a couple Kernel
   releases
 - the sn9c102 driver was moved to staging.  This driver was replaced by
   gspca, and disabled on some distros, as almost all devices are known
   to work properly with gspca.  It should be removed from kernel on a
   couple Kernel releases
 - lots of driver fixes, improvements and cleanups

* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (421 commits)
  [media] media: v4l2-dev: fix video device index assignment
  [media] rc-core: reuse device numbers
  [media] em28xx-cards: properly initialize the device bitmap
  [media] Staging: media: Fix line length exceeding 80 characters in as102_drv.c
  [media] Staging: media: Fix line length exceeding 80 characters in as102_fe.c
  [media] Staging: media: Fix quoted string split across line in as102_fe.c
  [media] media: st-rc: Add reset support
  [media] m2m-deinterlace: fix allocated struct type
  [media] radio-usb-si4713: fix sparse non static symbol warnings
  [media] em28xx-audio: remove needless check before usb_free_coherent()
  [media] au0828: Fix sparse non static symbol warning
  Revert "[media] go7007-usb: only use go->dev after allocated"
  [media] em28xx-audio: provide an error code when URB submit fails
  [media] em28xx: fix check for audio only usb interfaces when changing the usb alternate setting
  [media] em28xx: fix usb alternate setting for analog and digital video endpoints > 0
  [media] em28xx: make 'em28xx_ctrl_ops' static
  em28xx-alsa: Fix error patch for init/fini
  [media] em28xx-audio: flush work at .fini
  [media] drxk: remove the option to load firmware asynchronously
  [media] em28xx: adjust period size at runtime
  ...
2014-01-31 09:31:14 -08:00
Linus Torvalds
b890eb4ecc ACPI and power management fixes and cleanups for 3.14-rc1
- ACPI device hotplug fix preventing ACPI drivers from binding to device
    objects that acpi_bus_trim() has been called for and the devices
    represented by them may not be operational.
 
  - Recent cpufreq changes related to the "boost" (turbo) feature broke
    the acpi-cpufreq error code path causing a NULL pointer dereference
    to occur on some systems.  Fix from Konrad Rzeszutek Wilk.
 
  - The log level of a CPU initialization error message added recently
    needs to be reduced, because the particular BIOS issue indicated by
    it turns out to be widespread and doesn't really matter for the
    majority of systems having it.  From Jiang Liu.
 
  - The regulator API needs to be told to stay away from things on systems
    with ACPI BIOSes or it may conflict with the BIOS' own handling of
    voltage regulators.  Fix from Mark Brown that works around a 3.13
    regression in lm90 on PCs occuring if the regulator API is enabled.
 
  - Prevent the Exynos4 devfreq driver from being built on multiplatform,
    because it depends on things that aren't available during such builds.
    From Sachin Kamat.
 
  - Upstream ACPICA doesn't use the bool type as defined in the kernel,
    so modify the kernel's ACPICA code to follow the upstream in that
    respect (only one variable definition is affected) to reduce
    divergences between the two.  From Lv Zheng.
 
  - Make the ACPI device PM code use ACPI_COMPANION() instead of its own
    routine doing the same thing (and invokng ACPI_COMPANION() in the
    process).
 
  - Modify some routines in the ACPI processor driver to follow the
    common convention and return negative integers on errors.  From
    Hanjun Guo.
 
 /
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Merge tag 'pm+acpi-3.14-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and power management fixes and cleanups from Rafael Wysocki:

 - ACPI device hotplug fix preventing ACPI drivers from binding to device
   objects that acpi_bus_trim() has been called for and the devices
   represented by them may not be operational.

 - Recent cpufreq changes related to the "boost" (turbo) feature broke
   the acpi-cpufreq error code path causing a NULL pointer dereference
   to occur on some systems.  Fix from Konrad Rzeszutek Wilk.

 - The log level of a CPU initialization error message added recently
   needs to be reduced, because the particular BIOS issue indicated by
   it turns out to be widespread and doesn't really matter for the
   majority of systems having it.  From Jiang Liu.

 - The regulator API needs to be told to stay away from things on systems
   with ACPI BIOSes or it may conflict with the BIOS' own handling of
   voltage regulators.  Fix from Mark Brown that works around a 3.13
   regression in lm90 on PCs occuring if the regulator API is enabled.

 - Prevent the Exynos4 devfreq driver from being built on multiplatform,
   because it depends on things that aren't available during such builds.
   From Sachin Kamat.

 - Upstream ACPICA doesn't use the bool type as defined in the kernel,
   so modify the kernel's ACPICA code to follow the upstream in that
   respect (only one variable definition is affected) to reduce
   divergences between the two.  From Lv Zheng.

 - Make the ACPI device PM code use ACPI_COMPANION() instead of its own
   routine doing the same thing (and invokng ACPI_COMPANION() in the
   process).

 - Modify some routines in the ACPI processor driver to follow the
   common convention and return negative integers on errors.  From
   Hanjun Guo.

* tag 'pm+acpi-3.14-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / scan: Clear match_driver flag in acpi_bus_trim()
  ACPI / init: Flag use of ACPI and ACPI idioms for power supplies to regulator API
  acpi-cpufreq: De-register CPU notifier and free struct msr on error.
  ACPICA: Remove bool usage from ACPICA.
  PM / devfreq: Disable Exynos4 driver build on multiplatform
  ACPI / PM: Use ACPI_COMPANION() to get ACPI companions of devices
  ACPI / scan: reduce log level of "ACPI: \_PR_.CPU4: failed to get CPU APIC ID"
  ACPI / processor: Return specific error value when mapping lapic id
2014-01-31 09:23:52 -08:00
Mikulas Patocka
0ef38d70d4 alpha: fix broken network checksum
The patch 3ddc5b46a8 breaks networking on
alpha (there is a follow-up fix 5cfe8f1ba5,
but networking is still broken even with the second patch).

The patch 3ddc5b46a8 makes
csum_partial_copy_from_user check the pointer with access_ok. However,
csum_partial_copy_from_user is called also from csum_partial_copy_nocheck
and csum_partial_copy_nocheck is called on kernel pointers and it is
supposed not to check pointer validity.

This bug results in ssh session hangs if the system is loaded and bulk
data are printed to ssh terminal.

This patch fixes csum_partial_copy_nocheck to call set_fs(KERNEL_DS), so
that access_ok in csum_partial_copy_from_user accepts kernel-space
addresses.

Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Matt Turner <mattst88@gmail.com>
2014-01-31 09:21:55 -08:00
蔡正龙
a9302e8439 alpha: Enable system-call auditing support.
Signed-off-by: Zhenglong.cai <zhenglong.cai@cs2c.com.cn>
Signed-off-by: Matt Turner <mattst88@gmail.com>
2014-01-31 09:21:55 -08:00
Linus Torvalds
aafd9d6a46 Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer/dynticks updates from Ingo Molnar:
 "This tree contains misc dynticks updates: a fix and three cleanups"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/nohz: Fix overflow error in scheduler_tick_max_deferment()
  nohz_full: fix code style issue of tick_nohz_full_stop_tick
  nohz: Get timekeeping max deferment outside jiffies_lock
  tick: Rename tick_check_idle() to tick_irq_enter()
2014-01-31 09:02:51 -08:00
Linus Torvalds
595bf999e3 Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Ingo Molnar:
 "A crash fix and documentation updates"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched: Make sched_class::get_rr_interval() optional
  sched/deadline: Add sched_dl documentation
  sched: Fix docbook parameter annotation error in wait.h
2014-01-31 09:00:44 -08:00
Linus Torvalds
ab5318788c Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull core debug changes from Ingo Molnar:
 "This contains mostly kernel debugging related updates:

   - make hung_task detection more configurable to distros
   - add final bits for x86 UV NMI debugging, with related KGDB changes
   - update the mailing-list of MAINTAINERS entries I'm involved with"

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  hung_task: Display every hung task warning
  sysctl: Add neg_one as a standard constraint
  x86/uv/nmi, kgdb/kdb: Fix UV NMI handler when KDB not configured
  x86/uv/nmi: Fix Sparse warnings
  kgdb/kdb: Fix no KDB config problem
  MAINTAINERS: Restore "L: linux-kernel@vger.kernel.org" entries
2014-01-31 08:59:46 -08:00
Stephen Warren
75fae117a5 ALSA: hda/hdmi - allow PIN_OUT to be dynamically enabled
Commit 384a48d715 "ALSA: hda: HDMI: Support codecs with fewer cvts
than pins" dynamically enabled each pin widget's PIN_OUT only when the
pin was actively in use. This was required on certain NVIDIA CODECs for
correct operation. Specifically, if multiple pin widgets each had their
mux input select the same audio converter widget and each pin widget had
PIN_OUT enabled, then only one of the pin widgets would actually receive
the audio, and often not the one the user wanted!

However, this apparently broke some Intel systems, and commit
6169b67361 "ALSA: hda - Always turn on pins for HDMI/DP" reverted the
dynamic setting of PIN_OUT. This in turn broke the afore-mentioned NVIDIA
CODECs.

This change supports either dynamic or static handling of PIN_OUT,
selected by a flag set up during CODEC initialization. This flag is
enabled for all recent NVIDIA GPUs.

Reported-by: Uosis <uosisl@gmail.com>
Cc: <stable@vger.kernel.org> # v3.13
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-01-31 17:57:02 +01:00
Linus Torvalds
14164b46fc Bug-fixes:
- Xen ARM couldn't use the new FIFO events
  - Xen ARM couldn't use the SWIOTLB if compiled as 32-bit with 64-bit PCIe devices.
  - Grant table were doing needless M2P operations.
  - Ratchet down the self-balloon code so it won't OOM.
  - Fix misplaced kfree in Xen PVH error code paths.
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Merge tag 'stable/for-linus-3.14-rc0-late-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen bugfixes from Konrad Rzeszutek Wilk:
 "Bug-fixes for the new features that were added during this cycle.

  There are also two fixes for long-standing issues for which we have a
  solution: grant-table operations extra work that was not needed
  causing performance issues and the self balloon code was too
  aggressive causing OOMs.

  Details:
   - Xen ARM couldn't use the new FIFO events
   - Xen ARM couldn't use the SWIOTLB if compiled as 32-bit with 64-bit PCIe devices.
   - Grant table were doing needless M2P operations.
   - Ratchet down the self-balloon code so it won't OOM.
   - Fix misplaced kfree in Xen PVH error code paths"

* tag 'stable/for-linus-3.14-rc0-late-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/pvh: Fix misplaced kfree from xlated_setup_gnttab_pages
  drivers: xen: deaggressive selfballoon driver
  xen/grant-table: Avoid m2p_override during mapping
  xen/gnttab: Use phys_addr_t to describe the grant frame base address
  xen: swiotlb: handle sizeof(dma_addr_t) != sizeof(phys_addr_t)
  arm/xen: Initialize event channels earlier
2014-01-31 08:38:18 -08:00
Linus Torvalds
e2a0f813e0 Second batch of KVM updates. Some minor x86 fixes,
two s390 guest features that need some handling in the host,
 and all the PPC changes.  The PPC changes include support for
 little-endian guests and enablement for new POWER8 features.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull more KVM updates from Paolo Bonzini:
 "Second batch of KVM updates.  Some minor x86 fixes, two s390 guest
  features that need some handling in the host, and all the PPC changes.

  The PPC changes include support for little-endian guests and
  enablement for new POWER8 features"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (45 commits)
  x86, kvm: correctly access the KVM_CPUID_FEATURES leaf at 0x40000101
  x86, kvm: cache the base of the KVM cpuid leaves
  kvm: x86: move KVM_CAP_HYPERV_TIME outside #ifdef
  KVM: PPC: Book3S PR: Cope with doorbell interrupts
  KVM: PPC: Book3S HV: Add software abort codes for transactional memory
  KVM: PPC: Book3S HV: Add new state for transactional memory
  powerpc/Kconfig: Make TM select VSX and VMX
  KVM: PPC: Book3S HV: Basic little-endian guest support
  KVM: PPC: Book3S HV: Add support for DABRX register on POWER7
  KVM: PPC: Book3S HV: Prepare for host using hypervisor doorbells
  KVM: PPC: Book3S HV: Handle new LPCR bits on POWER8
  KVM: PPC: Book3S HV: Handle guest using doorbells for IPIs
  KVM: PPC: Book3S HV: Consolidate code that checks reason for wake from nap
  KVM: PPC: Book3S HV: Implement architecture compatibility modes for POWER8
  KVM: PPC: Book3S HV: Add handler for HV facility unavailable
  KVM: PPC: Book3S HV: Flush the correct number of TLB sets on POWER8
  KVM: PPC: Book3S HV: Context-switch new POWER8 SPRs
  KVM: PPC: Book3S HV: Align physical and virtual CPU thread numbers
  KVM: PPC: Book3S HV: Don't set DABR on POWER8
  kvm/ppc: IRQ disabling cleanup
  ...
2014-01-31 08:37:32 -08:00
Linus Torvalds
e30b82bbe0 Minor bug fix for linux-3.14
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Merge tag 'jfs-3.14' of git://github.com/kleikamp/linux-shaggy

Pull jfs fix from David Kleikamp:
 "Minor bug fix for linux-3.14"

* tag 'jfs-3.14' of git://github.com/kleikamp/linux-shaggy:
  jfs: fix xattr value size overflow in __jfs_setxattr
2014-01-31 08:14:35 -08:00
Sage Weil
77516dc92a ceph: fix missing dput in ceph_set_acl
Add matching dput() for d_find_alias().  Move d_find_alias() down a bit
at Julia's suggestion.

[ Introduced by commit 72466d0b92e0: "ceph: fix posix ACL hooks" ]

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Reported-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-01-31 08:14:06 -08:00
Sachin Prabhu
a9a315d414 cifs: Fix check for regular file in couldbe_mf_symlink()
MF Symlinks are regular files containing content in a specified format.

The function couldbe_mf_symlink() checks the mode for a set S_IFREG bit
as a test to confirm that it is a regular file. This bit is also set for
other filetypes and simply checking for this bit being set may return
false positives.

We ensure that we are actually checking for a regular file by using the
S_ISREG macro to test instead.

Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Reported-by: Neil Brown <neilb@suse.de>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steve French <smfrench@gmail.com>
2014-01-31 09:06:43 -06:00
Dave Jones
f93576e1ac xen/pvh: Fix misplaced kfree from xlated_setup_gnttab_pages
Passing a freed 'pages' to free_xenballooned_pages will end badly
on kernels with slub debug enabled.

This looks out of place between the rc assign and the check, but
we do want to kfree pages regardless of which path we take.

Signed-off-by: Dave Jones <davej@fedoraproject.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2014-01-31 09:48:58 -05:00
Bob Liu
bc1b0df59e drivers: xen: deaggressive selfballoon driver
Current xen-selfballoon driver is too aggressive which may cause OOM be
triggered more often. Eg. this bug reported by James:
https://lkml.org/lkml/2013/11/21/158

There are two mainly reasons:
1) The original goal_page didn't consider some pages used by kernel space, like
slab pages and pages used by device drivers.

2) The balloon driver may not give back memory to guest OS fast enough when the
workload suddenly aquries a lot of physical memory.

In both cases, the guest OS will suffer from memory pressure and OOM may
be triggered.

The fix is make xen-selfballoon driver not that aggressive by adding extra 10%
of total ram pages to goal_page.
It's more valuable to keep the guest system reliable and response faster than
balloon out these 10% pages to XEN.

Signed-off-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2014-01-31 09:48:43 -05:00
Zoltan Kiss
08ece5bb23 xen/grant-table: Avoid m2p_override during mapping
The grant mapping API does m2p_override unnecessarily: only gntdev needs it,
for blkback and future netback patches it just cause a lock contention, as
those pages never go to userspace. Therefore this series does the following:
- the original functions were renamed to __gnttab_[un]map_refs, with a new
  parameter m2p_override
- based on m2p_override either they follow the original behaviour, or just set
  the private flag and call set_phys_to_machine
- gnttab_[un]map_refs are now a wrapper to call __gnttab_[un]map_refs with
  m2p_override false
- a new function gnttab_[un]map_refs_userspace provides the old behaviour

It also removes a stray space from page.h and change ret to 0 if
XENFEAT_auto_translated_physmap, as that is the only possible return value
there.

v2:
- move the storing of the old mfn in page->index to gnttab_map_refs
- move the function header update to a separate patch

v3:
- a new approach to retain old behaviour where it needed
- squash the patches into one

v4:
- move out the common bits from m2p* functions, and pass pfn/mfn as parameter
- clear page->private before doing anything with the page, so m2p_find_override
  won't race with this

v5:
- change return value handling in __gnttab_[un]map_refs
- remove a stray space in page.h
- add detail why ret = 0 now at some places

v6:
- don't pass pfn to m2p* functions, just get it locally

Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
Suggested-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2014-01-31 09:48:32 -05:00
Malahal Naineni
a1800acaf7 nfs: initialize the ACL support bits to zero.
Avoid returning incorrect acl mask attributes when the server doesn't
support ACLs.

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
2014-01-31 08:28:16 -05:00