x86: move rdtsc_barrier() into the TSC vread method

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The *fence instructions were moved to vsyscall_64.c by commit
cb9e35dce9.  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>

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This commit is contained in:

Petr Tesarik 2009-05-25 11:02:02 +02:00 • committed by Thomas Gleixner

parent cd86a536c8

commit 7d96fd41ca

2 changed files with 10 additions and 9 deletions

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11

arch/x86/kernel/tsc.c

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8

arch/x86/kernel/vsyscall_64.c

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