x86/paravirt: use percpu_ rather than __get_cpu_var

Impact: minor optimisation

percpu_read/write is a slightly more direct way of getting
to percpu data.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index bf2e86eee80ce79314afddba89fca7b0cf0b3eb8..254e8aa8bfdb1f64da37941de41a20fc0850d4e8 100644 (file)
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -246,16 +246,16 @@ static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LA
 
 static inline void enter_lazy(enum paravirt_lazy_mode mode)
 {
-       BUG_ON(__get_cpu_var(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
+       BUG_ON(percpu_read(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
 
-       __get_cpu_var(paravirt_lazy_mode) = mode;
+       percpu_write(paravirt_lazy_mode, mode);
 }
 
 static void leave_lazy(enum paravirt_lazy_mode mode)
 {
-       BUG_ON(__get_cpu_var(paravirt_lazy_mode) != mode);
+       BUG_ON(percpu_read(paravirt_lazy_mode) != mode);
 
-       __get_cpu_var(paravirt_lazy_mode) = PARAVIRT_LAZY_NONE;
+       percpu_write(paravirt_lazy_mode, PARAVIRT_LAZY_NONE);
 }
 
 void paravirt_enter_lazy_mmu(void)
@@ -294,7 +294,7 @@ enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
        if (in_interrupt())
                return PARAVIRT_LAZY_NONE;
 
-       return __get_cpu_var(paravirt_lazy_mode);
+       return percpu_read(paravirt_lazy_mode);
 }
 
 void arch_flush_lazy_mmu_mode(void)