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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>
This commit is contained in:
Len Brown 2016-06-17 01:22:50 -04:00 committed by Ingo Molnar
parent 6fcb41cdae
commit 02c0cd2dcf
3 changed files with 3 additions and 7 deletions
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3
arch/x86/include/asm/tsc.h
View File

@ -52,7 +52,6 @@ extern int notsc_setup(char *);
extern void tsc_save_sched_clock_state(void);
extern void tsc_restore_sched_clock_state(void);
/* MSR based TSC calibration for Intel Atom SoC platforms */
unsigned long try_msr_calibrate_tsc(void);
unsigned long cpu_khz_from_msr(void);
#endif /* _ASM_X86_TSC_H */

5
arch/x86/kernel/tsc.c
View File

@ -674,10 +674,7 @@ unsigned long native_calibrate_tsc(void)
unsigned long flags, latch, ms, fast_calibrate;
int hpet = is_hpet_enabled(), i, loopmin;
/* Calibrate TSC using MSR for Intel Atom SoCs */
local_irq_save(flags);
fast_calibrate = try_msr_calibrate_tsc();
local_irq_restore(flags);
fast_calibrate = cpu_khz_from_msr();
if (fast_calibrate)
return fast_calibrate;

2
arch/x86/kernel/tsc_msr.c
View File

@ -68,7 +68,7 @@ static int match_cpu(u8 family, u8 model)
* Set global "lapic_timer_frequency" to bus_clock_cycles/jiffy
* Return processor base frequency in KHz, or 0 on failure.
*/
unsigned long try_msr_calibrate_tsc(void)
unsigned long cpu_khz_from_msr(void)
{
u32 lo, hi, ratio, freq_id, freq;
unsigned long res;