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vdso/vsyscall: Split up __arch_update_vsyscall() into __arch_update_vdso_clock()

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The upcoming auxiliary clocks need this hook, too.
To separate the architecture hooks from the timekeeper internals, refactor
the hook to only operate on a single vDSO clock.

While at it, use a more robust #define for the hook override.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250701-vdso-auxclock-v1-3-df7d9f87b9b8@linutronix.de
This commit is contained in:
Thomas Weißschuh
2025-07-01 10:57:57 +02:00
committed by Thomas Gleixner
parent 6fedaf682a
commit 76164ca0d1
3 changed files with 8 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
arch/arm64/include/asm/vdso/vsyscall.h
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@@ -13,12 +13,11 @@
* Update the vDSO data page to keep in sync with kernel timekeeping.
*/
static __always_inline
void __arm64_update_vsyscall(struct vdso_time_data *vdata)
void __arch_update_vdso_clock(struct vdso_clock *vc)
{
vdata->clock_data[CS_HRES_COARSE].mask = VDSO_PRECISION_MASK;
vdata->clock_data[CS_RAW].mask = VDSO_PRECISION_MASK;
vc->mask = VDSO_PRECISION_MASK;
}
#define __arch_update_vsyscall __arm64_update_vsyscall
#define __arch_update_vdso_clock __arch_update_vdso_clock
/* The asm-generic header needs to be included after the definitions above */
#include <asm-generic/vdso/vsyscall.h>

6
include/asm-generic/vdso/vsyscall.h
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@@ -22,11 +22,11 @@ static __always_inline const struct vdso_rng_data *__arch_get_vdso_u_rng_data(vo
#endif /* CONFIG_GENERIC_VDSO_DATA_STORE */
#ifndef __arch_update_vsyscall
static __always_inline void __arch_update_vsyscall(struct vdso_time_data *vdata)
#ifndef __arch_update_vdso_clock
static __always_inline void __arch_update_vdso_clock(struct vdso_clock *vc)
{
}
#endif /* __arch_update_vsyscall */
#endif /* __arch_update_vdso_clock */
#ifndef __arch_sync_vdso_time_data
static __always_inline void __arch_sync_vdso_time_data(struct vdso_time_data *vdata)

3
kernel/time/vsyscall.c
View File

@@ -118,7 +118,8 @@ void update_vsyscall(struct timekeeper *tk)
if (clock_mode != VDSO_CLOCKMODE_NONE)
update_vdso_time_data(vdata, tk);
__arch_update_vsyscall(vdata);
__arch_update_vdso_clock(&vc[CS_HRES_COARSE]);
__arch_update_vdso_clock(&vc[CS_RAW]);
vdso_write_end(vdata);