mirror of https://gitee.com/openkylin/linux.git
x86/tsc_msr: Remove irqoff around MSR-based TSC enumeration
Remove the irqoff/irqon around MSR-based TSC enumeration, as it is not necessary. Also rename: try_msr_calibrate_tsc() to cpu_khz_from_msr(), as that better describes what the routine does. Signed-off-by: Len Brown <len.brown@intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/a6b5c3ecd3b068175d2309599ab28163fc34215e.1466138954.git.len.brown@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -52,7 +52,6 @@ extern int notsc_setup(char *);
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extern void tsc_save_sched_clock_state(void);
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extern void tsc_restore_sched_clock_state(void);
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/* MSR based TSC calibration for Intel Atom SoC platforms */
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unsigned long try_msr_calibrate_tsc(void);
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unsigned long cpu_khz_from_msr(void);
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#endif /* _ASM_X86_TSC_H */
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@ -674,10 +674,7 @@ unsigned long native_calibrate_tsc(void)
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unsigned long flags, latch, ms, fast_calibrate;
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int hpet = is_hpet_enabled(), i, loopmin;
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/* Calibrate TSC using MSR for Intel Atom SoCs */
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local_irq_save(flags);
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fast_calibrate = try_msr_calibrate_tsc();
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local_irq_restore(flags);
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fast_calibrate = cpu_khz_from_msr();
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if (fast_calibrate)
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return fast_calibrate;
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@ -68,7 +68,7 @@ static int match_cpu(u8 family, u8 model)
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* Set global "lapic_timer_frequency" to bus_clock_cycles/jiffy
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* Return processor base frequency in KHz, or 0 on failure.
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*/
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unsigned long try_msr_calibrate_tsc(void)
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unsigned long cpu_khz_from_msr(void)
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{
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u32 lo, hi, ratio, freq_id, freq;
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unsigned long res;
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