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pvclock: Get rid of __pvclock_read_cycles in function pvclock_read_flags

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There is a generic function __pvclock_read_cycles to be used to get both
flags and cycles. For function pvclock_read_flags, it's useless to get
cycles value. To make this function be more effective, get this variable
flags directly in function.

Signed-off-by: Minfei Huang <mnghuan@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Minfei Huang 2016-05-28 20:27:43 +08:00 committed by Paolo Bonzini
parent f7550d076d
commit ed911b43ad
1 changed files with 5 additions and 2 deletions
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7
arch/x86/kernel/pvclock.c
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@ -61,11 +61,14 @@ void pvclock_resume(void)
u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src)
{
unsigned version;
cycle_t ret;
u8 flags;
do {
version = __pvclock_read_cycles(src, &ret, &flags);
version = src->version;
/* Make the latest version visible */
smp_rmb();
flags = src->flags;
/* Make sure that the version double-check is last. */
smp_rmb();
} while ((src->version & 1) || version != src->version);