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The X86_FEATURE_TSC_RELIABLE flag in Linux kernel implies both reliable (at runtime) and trustable (at calibration). But reliable running and trustable calibration independent of each other. Add a new flag X86_FEATURE_TSC_KNOWN_FREQ, which denotes that the frequency is known (via MSR/CPUID). This flag is only meant to skip the long term calibration on systems which have a known frequency. Add X86_FEATURE_TSC_KNOWN_FREQ to the skip the delayed calibration and leave X86_FEATURE_TSC_RELIABLE in place. After converting the existing users of X86_FEATURE_TSC_RELIABLE to use either both flags or just X86_FEATURE_TSC_KNOWN_FREQ we can seperate the functionality. Suggested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Bin Gao <bin.gao@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1479241644-234277-2-git-send-email-bin.gao@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
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