x86: use this_cpu for debug_stack_usage

[Christoph Lameter]

Reduces overhead a bit and frees up a couple of registers.

Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>

Index: linux/arch/x86/include/asm/debugreg.h
===================================================================
--- linux.orig/arch/x86/include/asm/debugreg.h	2013-07-30 14:00:30.000000000 -0500
+++ linux/arch/x86/include/asm/debugreg.h	2013-07-30 14:00:57.503076270 -0500
@@ -97,11 +97,11 @@ extern void hw_breakpoint_restore(void);
 DECLARE_PER_CPU(int, debug_stack_usage);
 static inline void debug_stack_usage_inc(void)
 {
-	__get_cpu_var(debug_stack_usage)++;
+	__this_cpu_inc(debug_stack_usage);
 }
 static inline void debug_stack_usage_dec(void)
 {
-	__get_cpu_var(debug_stack_usage)--;
+	__this_cpu_dec(debug_stack_usage);
 }
 int is_debug_stack(unsigned long addr);
 void debug_stack_set_zero(void);
--
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