xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ia64: Fix up smp_mb__{before,after}_clear_bit()

Browse Source 
IA64 doesn't actually have acquire/release barriers, its a lie!

Add a comment explaining this and fix up the bitop barriers.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-akevfh136um9dqvb1ohm55ca@git.kernel.org
Cc: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-ia64@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra
2014-02-04 20:36:01 +01:00
committed by Ingo Molnar
parent 81cef0fe19
commit e4f9bfb3fe
2 changed files with 11 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
arch/ia64/include/asm/bitops.h
View File

@@ -65,11 +65,8 @@ __set_bit (int nr, volatile void *addr)
*((__u32 *) addr + (nr >> 5)) |= (1 << (nr & 31));
}
/*
* clear_bit() has "acquire" semantics.
*/
#define smp_mb__before_clear_bit() smp_mb()
#define smp_mb__after_clear_bit() do { /* skip */; } while (0)
#define smp_mb__before_clear_bit() barrier();
#define smp_mb__after_clear_bit() barrier();
/**
* clear_bit - Clears a bit in memory