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s390/vdso: simplify __arch_get_hw_counter()

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Use the passed in vdso_data pointer instead of calculating it again.
This is also required as a prerequisite for vdso time namespaces: if a
process is part of a time namespace __arch_get_vdso_data() will return
a pointer to the time namespace data page instead of the vdso data
page, which is not what __arch_get_hw_counter() expects.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-01-31 22:27:36 +01:00 committed by Vasily Gorbik
parent 214b356486
commit 1ba2d6c0fd
1 changed files with 2 additions and 3 deletions
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5
arch/s390/include/asm/vdso/gettimeofday.h
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@ -24,13 +24,12 @@ static __always_inline const struct vdso_data *__arch_get_vdso_data(void)
static inline u64 __arch_get_hw_counter(s32 clock_mode, const struct vdso_data *vd)
{
const struct vdso_data *vdso = __arch_get_vdso_data();
u64 adj, now;
now = get_tod_clock();
adj = vdso->arch_data.tod_steering_end - now;
adj = vd->arch_data.tod_steering_end - now;
if (unlikely((s64) adj > 0))
now += (vdso->arch_data.tod_steering_delta < 0) ? (adj >> 15) : -(adj >> 15);
now += (vd->arch_data.tod_steering_delta < 0) ? (adj >> 15) : -(adj >> 15);
return now;
}