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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2020-01-16 17:58:27 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-01-16 21:24:46 +0100 |
| commit | 49a101d7169c7729c7bab6b2f896faae34bd6c3d (patch) | |
| tree | aa7bd28f1b8b3d1fb945ff9136f1fddc4810b8b0 /lib | |
| parent | 99570c3da96a0f7aa11c6ad4981776f3adabf3b5 (diff) | |
| download | lwn-49a101d7169c7729c7bab6b2f896faae34bd6c3d.tar.gz lwn-49a101d7169c7729c7bab6b2f896faae34bd6c3d.zip | |
lib/vdso: Only read hrtimer_res when needed in __cvdso_clock_getres()
Only perform READ_ONCE(vd[CS_HRES_COARSE].hrtimer_res) for
HRES and RAW clocks.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/7ac2f0d21652f95e2bbdfa6bd514ae6c7caf53ab.1579196675.git.christophe.leroy@c-s.fr
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/vdso/gettimeofday.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c index f342ac1fce77..f8b8ec5e63ac 100644 --- a/lib/vdso/gettimeofday.c +++ b/lib/vdso/gettimeofday.c @@ -312,7 +312,6 @@ static __maybe_unused int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res) { const struct vdso_data *vd = __arch_get_vdso_data(); - u64 hrtimer_res; u32 msk; u64 ns; @@ -323,7 +322,6 @@ int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res) if (IS_ENABLED(CONFIG_TIME_NS) && vd->clock_mode == VCLOCK_TIMENS) vd = __arch_get_timens_vdso_data(); - hrtimer_res = READ_ONCE(vd[CS_HRES_COARSE].hrtimer_res); /* * Convert the clockid to a bitmask and use it to check which * clocks are handled in the VDSO directly. @@ -333,7 +331,7 @@ int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res) /* * Preserves the behaviour of posix_get_hrtimer_res(). */ - ns = hrtimer_res; + ns = READ_ONCE(vd[CS_HRES_COARSE].hrtimer_res); } else if (msk & VDSO_COARSE) { /* * Preserves the behaviour of posix_get_coarse_res(). |