From e4f9bfb3feaeaca55cf177dadb7e3313836b10f4 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Tue, 4 Feb 2014 20:36:01 +0100 Subject: ia64: Fix up smp_mb__{before,after}_clear_bit() 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 Acked-by: Paul E. McKenney Link: http://lkml.kernel.org/n/tip-akevfh136um9dqvb1ohm55ca@git.kernel.org Cc: Akinobu Mita Cc: Fenghua Yu Cc: Linus Torvalds Cc: Tony Luck Cc: linux-ia64@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar --- arch/ia64/include/asm/bitops.h | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'arch/ia64/include/asm/bitops.h') diff --git a/arch/ia64/include/asm/bitops.h b/arch/ia64/include/asm/bitops.h index c27eccd33349..feb8117ed06a 100644 --- a/arch/ia64/include/asm/bitops.h +++ b/arch/ia64/include/asm/bitops.h @@ -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 -- cgit v1.2.3-59-g8ed1b