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(parent: cd86a53) | patch
x86: move rdtsc_barrier() into the TSC vread method
authorPetr Tesarik <ptesarik@suse.cz>
Mon, 25 May 2009 09:02:02 +0000 (11:02 +0200)
committerThomas Gleixner <tglx@linutronix.de>
Thu, 28 May 2009 12:15:54 +0000 (14:15 +0200)
commit7d96fd41cadc55f4e00231c8c71b8e25c779f122
treea52e633f9f7b33f8bd4dead21c22d54f94955293tree | snapshot (tar.gz zip)
parentcd86a536c81e9300d984327517548ca0652eebf9commit | diff
x86: move rdtsc_barrier() into the TSC vread method

The *fence instructions were moved to vsyscall_64.c by commit
cb9e35dce94a1b9c59d46224e8a94377d673e204.  But this breaks the
vDSO, because vread methods are also called from there.

Besides, the synchronization might be unnecessary for other
time sources than TSC.

[ Impact: fix potential time warp in VDSO ]

Signed-off-by: Petr Tesarik <ptesarik@suse.cz>
LKML-Reference: <9d0ea9ea0f866bdc1f4d76831221ae117f11ea67.1243241859.git.ptesarik@suse.cz>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@kernel.org>
arch/x86/kernel/tsc.c diff | blob | blame | history
arch/x86/kernel/vsyscall_64.c diff | blob | blame | history