x86: Add cpu capability flag X86_FEATURE_NONSTOP_TSC_S3

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On some new Intel Atom processors (Penwell and Cloverview), there is
a feature that the TSC won't stop in S3 state, say the TSC value
won't be reset to 0 after resume. This feature makes TSC a more reliable
clocksource and could benefit the timekeeping code during system
suspend/resume cycle, so add a flag for it.

Signed-off-by: Feng Tang <feng.tang@intel.com>
[jstultz: Fix checkpatch warning]
Signed-off-by: John Stultz <john.stultz@linaro.org>

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Feng Tang 2013-03-12 11:56:45 +08:00 • committed by John Stultz

parent 3195ef59cb

commit c54fdbb282

2 changed files with 13 additions and 0 deletions

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1

arch/x86/include/asm/cpufeature.h

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12

arch/x86/kernel/cpu/intel.c

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