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authorIngo Molnar <mingo@elte.hu>2007-02-16 01:27:34 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 08:13:57 -0800
commit95492e4646e5de8b43d9a7908d6177fb737b61f0 (patch)
treeae25cd206ca76f78d50ac2a206ef012e0ab1d9df /drivers/clocksource/cyclone.c
parent92c7e00254b2d0efc1e36ac3e45474ce1871b6b2 (diff)
[PATCH] x86: rewrite SMP TSC sync code
make the TSC synchronization code more robust, and unify it between x86_64 and i386. The biggest change is the removal of the 'fix up TSCs' code on x86_64 and i386, in some rare cases it was /causing/ time-warps on SMP systems. The new code only checks for TSC asynchronity - and if it can prove a time-warp (if it can observe the TSC going backwards when going from one CPU to another within a critical section), then the TSC clock-source is turned off. The TSC synchronization-checking code also got moved into a separate file. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: john stultz <johnstul@us.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/clocksource/cyclone.c')
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