From: Petr Tesarik <ptesarik@suse.cz>
Date: Mon, 25 May 2009 09:02:02 +0000 (+0200)
Subject: x86: move rdtsc_barrier() into the TSC vread method
X-Git-Tag: v2.6.31-rc1~411^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d96fd41cadc55f4e00231c8c71b8e25c779f122;p=pandora-kernel.git

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>
---

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