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lib/vdso: Avoid highres update if clocksource is not VDSO capable 

If the current clocksource is not VDSO capable there is no point in
updating the high resolution parts of the VDSO data.

Replace the architecture specific check with a check for a VDSO capable
clocksource and skip the update if there is none.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lkml.kernel.org/r/20200207124403.563379423@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-02-07 13:39:00 +01:00
parent f86fd32db7
commit c7a18100bd
3 changed files with 3 additions and 17 deletions
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7
arch/arm/include/asm/vdso/vsyscall.h
View File

@ -21,13 +21,6 @@ struct vdso_data *__arm_get_k_vdso_data(void)
}
#define __arch_get_k_vdso_data __arm_get_k_vdso_data
static __always_inline
bool __arm_update_vdso_data(void)
{
return cntvct_ok;
}
#define __arch_update_vdso_data __arm_update_vdso_data
static __always_inline
void __arm_sync_vdso_data(struct vdso_data *vdata)
{

7
include/asm-generic/vdso/vsyscall.h
View File

@ -11,13 +11,6 @@ static __always_inline struct vdso_data *__arch_get_k_vdso_data(void)
}
#endif /* __arch_get_k_vdso_data */
#ifndef __arch_update_vdso_data
static __always_inline bool __arch_update_vdso_data(void)
{
return true;
}
#endif /* __arch_update_vdso_data */
#ifndef __arch_update_vsyscall
static __always_inline void __arch_update_vsyscall(struct vdso_data *vdata,
struct timekeeper *tk)

6
kernel/time/vsyscall.c
View File

@ -105,10 +105,10 @@ void update_vsyscall(struct timekeeper *tk)
WRITE_ONCE(vdata[CS_HRES_COARSE].hrtimer_res, hrtimer_resolution);
/*
* Architectures can opt out of updating the high resolution part
* of the VDSO.
* If the current clocksource is not VDSO capable, then spare the
* update of the high reolution parts.
*/
if (__arch_update_vdso_data())
if (clock_mode != VDSO_CLOCKMODE_NONE)
update_vdso_data(vdata, tk);
__arch_update_vsyscall(vdata, tk);