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authorMarcelo Tosatti <mtosatti@redhat.com>2012-11-28 05:28:52 +0400
committerMarcelo Tosatti <mtosatti@redhat.com>2012-11-28 05:29:08 +0400
commit2697902be89d7f38e9736dfe946cd0e5d4f47b80 (patch)
treec1588307560a7a4ecd05bc3d1eff8a36bf3b4fe3 /arch/x86/kernel/pvclock.c
parentdce2db0a35197e2f4421245079f19ab753e97348 (diff)
downloadlinux-2697902be89d7f38e9736dfe946cd0e5d4f47b80.tar.xz
x86: pvclock: introduce helper to read flags
Acked-by: Glauber Costa <glommer@parallels.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kernel/pvclock.c')
-rw-r--r--arch/x86/kernel/pvclock.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c
index a7d90910c61a..c8fb043a8695 100644
--- a/arch/x86/kernel/pvclock.c
+++ b/arch/x86/kernel/pvclock.c
@@ -45,6 +45,19 @@ void pvclock_resume(void)
atomic64_set(&last_value, 0);
}
+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);
+ } while ((src->version & 1) || version != src->version);
+
+ return flags & valid_flags;
+}
+
cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src)
{
unsigned version;