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Commit 2697902b authored by Marcelo Tosatti's avatar Marcelo Tosatti
Browse files

x86: pvclock: introduce helper to read flags 



Acked-by: default avatarGlauber Costa <glommer@parallels.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent dce2db0a

arch/x86/include/asm/pvclock.h

+1 −0
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 


/* some helper functions for xen and kvm pv clock sources */

cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src);

u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src);

void pvclock_set_flags(u8 flags);

unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src);

void pvclock_read_wallclock(struct pvclock_wall_clock *wall,

arch/x86/kernel/pvclock.c

+13 −0
Original line number Diff line number Diff line
@@ -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;