Commit-ID: 7d590cca7cd2cce4ed7c47d221d6f90566653ba8 Gitweb: http://git.kernel.org/tip/7d590cca7cd2cce4ed7c47d221d6f90566653ba8 Author: H. Peter Anvin <[email protected]> AuthorDate: Thu, 19 Dec 2013 12:30:03 -0800 Committer: H. Peter Anvin <[email protected]> CommitDate: Thu, 19 Dec 2013 12:30:03 -0800
x86, idle: Add memory barriers around clflush in mwait_play_dead() For consistency with mwait_idle_with_hints(). Not sure they help, but they really won't hurt... Signed-off-by: H. Peter Anvin <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Len Brown <[email protected]> Link: http://lkml.kernel.org/r/ca%2b55afzgxcml7j8cevqpyzh0w81uvoaavmgctmouz7cz1yy...@mail.gmail.com --- arch/x86/kernel/smpboot.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 85dc05a..f5252c4 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1417,7 +1417,9 @@ static inline void mwait_play_dead(void) * The WBINVD is insufficient due to the spurious-wakeup * case where we return around the loop. */ + mb(); clflush(mwait_ptr); + mb(); __monitor(mwait_ptr, 0, 0); mb(); __mwait(eax, 0); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
