kernel_optimize_test/arch
Linus Torvalds 83d349f35e x86: don't send an IPI to the empty set of CPU's
The default_send_IPI_mask_logical() function uses the "flat" APIC mode
to send an IPI to a set of CPU's at once, but if that set happens to be
empty, some older local APIC's will apparently be rather unhappy.  So
just warn if a caller gives us an empty mask, and ignore it.

This fixes a regression in 2.6.30.x, due to commit 4595f9620 ("x86:
change flush_tlb_others to take a const struct cpumask"), documented
here:

	http://bugzilla.kernel.org/show_bug.cgi?id=13933

which causes a silent lock-up.  It only seems to happen on PPro, P2, P3
and Athlon XP cores.  Most developers sadly (or not so sadly, if you're
a developer..) have more modern CPU's.  Also, on x86-64 we don't use the
flat APIC mode, so it would never trigger there even if the APIC didn't
like sending an empty IPI mask.

Reported-by: Pavel Vilim <wylda@volny.cz>
Reported-and-tested-by: Thomas Björnell <thomas.bjornell@gmail.com>
Reported-and-tested-by: Martin Rogge <marogge@onlinehome.de>
Cc: Mike Travis <travis@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-08-21 09:23:57 -07:00
..
alpha mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
arm ARM: 5673/1: U300 fix initsection compile warning 2009-08-15 15:36:52 +01:00
avr32 mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
blackfin blackfin: fix wrong CTS inversion 2009-07-20 16:38:44 -07:00
cris mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
frv mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
h8300 sched: INIT_PREEMPT_COUNT 2009-07-10 14:24:05 -07:00
ia64 arch/ia64/kernel/iosapic: missing test after ioremap() 2009-08-11 14:52:11 -07:00
m32r mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
m68k mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
m68knommu Remove multiple KERN_ prefixes from printk formats 2009-07-08 10:30:03 -07:00
microblaze microblaze: Update Microblaze defconfigs 2009-08-18 11:05:11 +02:00
mips Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus 2009-08-17 13:39:52 -07:00
mn10300 MN10300: includecheck fix: mn10300, pci.h 2009-08-10 08:54:27 -07:00
parisc parisc: Set correct bit in protection flags 2009-08-02 12:36:05 +02:00
powerpc Merge branch 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-08-10 11:48:51 -07:00
s390 Merge branch 'kvm-updates/2.6.31' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2009-08-09 14:58:21 -07:00
sh sh: sh7724 ddr self-refresh changes 2009-08-15 12:58:50 +09:00
sparc percpu, sparc64: fix sparse possible cpu map handling 2009-08-14 13:20:53 +09:00
um mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
x86 x86: don't send an IPI to the empty set of CPU's 2009-08-21 09:23:57 -07:00
xtensa mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
.gitignore
Kconfig gcov: add gcov profiling infrastructure 2009-06-18 13:03:57 -07:00