linux-kernel - x86: use this_cpu for debug_stack

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Message-ID: <000001405493dacb-4d662921-2531-400a-a426-4f76c8066ede-000000@email.amazonses.com>
Date:	Tue, 6 Aug 2013 17:01:50 +0000
From:	Christoph Lameter <cl@...two.org>
To:	rostedt@...dmis.org
cc:	linux-kernel@...r.kernel.org
Subject: x86: use this_cpu for debug_stack_usage

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

Signed-off-by: Christoph Lameter <cl@...ux.com>

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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