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Michael Ellerman 78e05b1421 powerpc: Add smp_mb()s to arch_spin_unlock_wait() 
Similar to the previous commit which described why we need to add a
barrier to arch_spin_is_locked(), we have a similar problem with
spin_unlock_wait().

We need a barrier on entry to ensure any spinlock we have previously
taken is visibly locked prior to the load of lock->slock.

It's also not clear if spin_unlock_wait() is intended to have ACQUIRE
semantics. For now be conservative and add a barrier on exit to give it
ACQUIRE semantics.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-08-13 15:13:27 +10:00
..
alloc.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
checksum_32.S
checksum_64.S powerpc: Restore registers on error exit from csum_partial_copy_generic() 2013-10-03 17:22:42 +10:00
checksum_wrappers_64.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
code-patching.c powerpc: Move the patch_exception to a common place 2013-12-02 14:06:54 +11:00
copy_32.S powerpc: Fix incorrect .stabs entry for copy_32.S 2010-09-02 14:07:34 +10:00
copypage_64.S powerpc: Exported functions __clear_user and copy_page use r2 so need _GLOBAL_TOC() 2014-06-05 13:20:41 +10:00
copypage_power7.S powerpc: Fix unsafe accesses to parameter area in ELFv2 2014-04-23 10:05:24 +10:00
copyuser_64.S powerpc: Remove power3 from comments 2014-07-28 14:10:26 +10:00
copyuser_power7.S powerpc: Fix unsafe accesses to parameter area in ELFv2 2014-04-23 10:05:24 +10:00
crtsavres.S powerpc: Add vr save/restore functions 2014-01-15 13:46:43 +11:00
devres.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
div64.S
feature-fixups-test.S powerpc: Ensure the else case of feature sections will fit 2011-01-21 14:08:33 +11:00
feature-fixups.c powerpc: Copy down exception vectors after feature fixups 2011-11-16 14:47:54 +11:00
hweight_64.S powerpc: No need to use dot symbols when branching to a function 2014-04-23 10:05:16 +10:00
ldstfp.S powerpc: Fixes for instructions not using correct register naming 2012-07-10 19:18:16 +10:00
locks.c powerpc: Add smp_mb()s to arch_spin_unlock_wait() 2014-08-13 15:13:27 +10:00
Makefile powerpc: memcpy optimization for 64bit LE 2014-04-30 15:26:18 +10:00
mem_64.S powerpc: use _GLOBAL_TOC for memmove 2014-07-22 15:56:04 +10:00
memcpy_64.S Merge remote-tracking branch 'anton/abiv2' into next 2014-05-05 20:57:12 +10:00
memcpy_power7.S powerpc: Fix unsafe accesses to parameter area in ELFv2 2014-04-23 10:05:24 +10:00
rheap.c powerpc: various straight conversions from module.h --> export.h 2011-10-31 19:30:44 -04:00
sstep.c powerpc: Fix bugs in emulate_step() 2014-07-22 15:55:51 +10:00
string_64.S powerpc: Exported functions __clear_user and copy_page use r2 so need _GLOBAL_TOC() 2014-06-05 13:20:41 +10:00
string.S powerpc: 64bit optimised __clear_user 2012-07-03 14:14:41 +10:00
usercopy_64.c
vmx-helper.c powerpc: POWER7 optimised copy_page using VMX and enhanced prefetch 2012-07-03 14:14:44 +10:00
xor_vmx.c powerpc: Add VMX optimised xor for RAID5 2013-10-30 16:02:28 +11:00