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x86/timers: Move the simple udelay calibration to tsc.h 

Commit dd759d93f4 ("x86/timers: Add simple udelay calibration") adds
an static function in x86 boot-time initializations.

But, this function is actually related to TSC, so it should be maintained
in tsc.c, not in setup.c.

Move simple_udelay_calibration() from setup.c to tsc.c and rename it to
tsc_early_delay_calibrate for more readability.

Signed-off-by: Dou Liyang <douly.fnst@cn.fujitsu.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/1500003247-17368-1-git-send-email-douly.fnst@cn.fujitsu.com
This commit is contained in:
Dou Liyang 2017-07-14 11:34:06 +08:00 committed by Thomas Gleixner
parent e19b205be4
commit eb496063c9
3 changed files with 21 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/tsc.h
View File

@ -31,6 +31,7 @@ static inline cycles_t get_cycles(void)
extern struct system_counterval_t convert_art_to_tsc(u64 art);
extern void tsc_early_delay_calibrate(void);
extern void tsc_init(void);
extern void mark_tsc_unstable(char *reason);
extern int unsynchronized_tsc(void);

22
arch/x86/kernel/setup.c
View File

@ -822,26 +822,6 @@ dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
return 0;
}
static void __init simple_udelay_calibration(void)
{
unsigned int tsc_khz, cpu_khz;
unsigned long lpj;
if (!boot_cpu_has(X86_FEATURE_TSC))
return;
cpu_khz = x86_platform.calibrate_cpu();
tsc_khz = x86_platform.calibrate_tsc();
tsc_khz = tsc_khz ? : cpu_khz;
if (!tsc_khz)
return;
lpj = tsc_khz * 1000;
do_div(lpj, HZ);
loops_per_jiffy = lpj;
}
/*
* Determine if we were loaded by an EFI loader. If so, then we have also been
* passed the efi memmap, systab, etc., so we should use these data structures
@ -1049,7 +1029,7 @@ void __init setup_arch(char **cmdline_p)
*/
init_hypervisor_platform();
simple_udelay_calibration();
tsc_early_delay_calibrate();
x86_init.resources.probe_roms();

19
arch/x86/kernel/tsc.c
View File

@ -1263,6 +1263,25 @@ static int __init init_tsc_clocksource(void)
*/
device_initcall(init_tsc_clocksource);
void __init tsc_early_delay_calibrate(void)
{
unsigned long lpj;
if (!boot_cpu_has(X86_FEATURE_TSC))
return;
cpu_khz = x86_platform.calibrate_cpu();
tsc_khz = x86_platform.calibrate_tsc();
tsc_khz = tsc_khz ? : cpu_khz;
if (!tsc_khz)
return;
lpj = tsc_khz * 1000;
do_div(lpj, HZ);
loops_per_jiffy = lpj;
}
void __init tsc_init(void)
{
u64 lpj, cyc;