xen: Use this_cpu_ops
Use this_cpu_ops to reduce code size and simplify things in various places.
V3->V4:
Move instance of this_cpu_inc_return to a later patchset so that
this patch can be applied without infrastructure changes.
Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
index 23e061b..cc9b1e1 100644
--- a/arch/x86/xen/spinlock.c
+++ b/arch/x86/xen/spinlock.c
@@ -159,8 +159,8 @@
{
struct xen_spinlock *prev;
- prev = __get_cpu_var(lock_spinners);
- __get_cpu_var(lock_spinners) = xl;
+ prev = __this_cpu_read(lock_spinners);
+ __this_cpu_write(lock_spinners, xl);
wmb(); /* set lock of interest before count */
@@ -179,14 +179,14 @@
asm(LOCK_PREFIX " decw %0"
: "+m" (xl->spinners) : : "memory");
wmb(); /* decrement count before restoring lock */
- __get_cpu_var(lock_spinners) = prev;
+ __this_cpu_write(lock_spinners, prev);
}
static noinline int xen_spin_lock_slow(struct arch_spinlock *lock, bool irq_enable)
{
struct xen_spinlock *xl = (struct xen_spinlock *)lock;
struct xen_spinlock *prev;
- int irq = __get_cpu_var(lock_kicker_irq);
+ int irq = __this_cpu_read(lock_kicker_irq);
int ret;
u64 start;