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authorWill Deacon <will.deacon@arm.com>2015-08-06 19:54:41 +0300
committerIngo Molnar <mingo@kernel.org>2015-08-12 12:59:05 +0300
commit2b2a85a4d3534b8884fcfa5bb52837f0e1c672bc (patch)
treee81e07f44f5018c49ffda73aefd2e3cc9bb19291 /arch/x86/include/asm/qrwlock.h
parentf5468ffde13fc991bd4d6bdec507ffd5777865bd (diff)
downloadlinux-2b2a85a4d3534b8884fcfa5bb52837f0e1c672bc.tar.xz
locking/qrwlock: Implement queue_write_unlock() using smp_store_release()
Since the following commit: 536fa402221f ("compiler: Allow 1- and 2-byte smp_load_acquire() and smp_store_release()") smp_store_release() supports byte accesses, so use that in writer unlock and remove the conditional macro override. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Waiman Long <Waiman.Long@hp.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1438880084-18856-6-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/qrwlock.h')
-rw-r--r--arch/x86/include/asm/qrwlock.h10
1 files changed, 0 insertions, 10 deletions
diff --git a/arch/x86/include/asm/qrwlock.h b/arch/x86/include/asm/qrwlock.h
index a8810bf135ab..c537cbb038a7 100644
--- a/arch/x86/include/asm/qrwlock.h
+++ b/arch/x86/include/asm/qrwlock.h
@@ -2,16 +2,6 @@
#define _ASM_X86_QRWLOCK_H
#include <asm-generic/qrwlock_types.h>
-
-#ifndef CONFIG_X86_PPRO_FENCE
-#define queued_write_unlock queued_write_unlock
-static inline void queued_write_unlock(struct qrwlock *lock)
-{
- barrier();
- ACCESS_ONCE(*(u8 *)&lock->cnts) = 0;
-}
-#endif
-
#include <asm-generic/qrwlock.h>
#endif /* _ASM_X86_QRWLOCK_H */