Commit ed911b43 authored May 28, 2016 by Minfei Huang Committed by Paolo Bonzini Jun 27, 2016

pvclock: Get rid of __pvclock_read_cycles in function pvclock_read_flags



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>

parent f7550d07

arch/x86/kernel/pvclock.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -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);