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UPSTREAM: lib/vdso: Only read hrtimer_res when needed in __cvdso_clock_getres()

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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
(cherry picked from commit 49a101d7169c7729c7bab6b2f896faae34bd6c3d)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 154668398
Change-Id: I0441a793d4703755e8026f23c07e5c1f12544319
This commit is contained in:
Christophe Leroy 2020-01-16 17:58:27 +00:00 • committed by Alistair Delva
commit 63bc2c97b7
1 changed files with 1 additions and 3 deletions
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4
lib/vdso/gettimeofday.c
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@ -186,7 +186,6 @@ 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;
@ -194,7 +193,6 @@ int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res)
if (unlikely((u32) clock >= MAX_CLOCKS))
return -1;
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.
@ -204,7 +202,7 @@ 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().