linux-kernel - [PATCH v2 4/5] x86: change percpu_read_stable to this_cpu_read

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Date:	Fri, 13 Jan 2012 23:53:37 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	linux-kernel@...r.kernel.org, cl@...two.org,
	eric.dumazet@...il.com, tglx@...utronix.de, avi@...hat.com,
	akpm@...ux-foundation.org, davem@...emloft.net, kaber@...sh.net,
	a.p.zijlstra@...llo.nl, ying.huang@...el.com,
	konrad.wilk@...cle.com, hpa@...or.com, jeremy@...p.org
Subject: [PATCH v2 4/5] x86: change percpu_read_stable to this_cpu_read_stable

It has no function change. It's a preparation for percpu_xxx serial
function change.

Signed-off-by: Alex Shi <alex.shi@...el.com>
Acked-by: Christoph Lameter <cl@...two.org>
Acked-by: Tejun Heo <tj@...nel.org>
---
 arch/x86/include/asm/current.h     |    2 +-
 arch/x86/include/asm/percpu.h      |    6 +++---
 arch/x86/include/asm/thread_info.h |    2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/current.h b/arch/x86/include/asm/current.h
index 4d447b7..9476c04 100644
--- a/arch/x86/include/asm/current.h
+++ b/arch/x86/include/asm/current.h
@@ -11,7 +11,7 @@ DECLARE_PER_CPU(struct task_struct *, current_task);
 
 static __always_inline struct task_struct *get_current(void)
 {
-	return percpu_read_stable(current_task);
+	return this_cpu_read_stable(current_task);
 }
 
 #define current get_current()
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 276bbc0..8d256ad 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -352,15 +352,15 @@ do {									\
 
 /*
  * percpu_read() makes gcc load the percpu variable every time it is
- * accessed while percpu_read_stable() allows the value to be cached.
- * percpu_read_stable() is more efficient and can be used if its value
+ * accessed while this_cpu_read_stable() allows the value to be cached.
+ * this_cpu_read_stable() is more efficient and can be used if its value
  * is guaranteed to be valid across cpus.  The current users include
  * get_current() and get_thread_info() both of which are actually
  * per-thread variables implemented as per-cpu variables and thus
  * stable for the duration of the respective task.
  */
 #define percpu_read(var)		percpu_from_op("mov", var, "m" (var))
-#define percpu_read_stable(var)		percpu_from_op("mov", var, "p" (&(var)))
+#define this_cpu_read_stable(var)	percpu_from_op("mov", var, "p" (&(var)))
 #define percpu_write(var, val)		percpu_to_op("mov", var, val)
 #define percpu_add(var, val)		percpu_add_op(var, val)
 #define percpu_sub(var, val)		percpu_add_op(var, -(val))
diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index bc817cd..3544992 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -218,7 +218,7 @@ DECLARE_PER_CPU(unsigned long, kernel_stack);
 static inline struct thread_info *current_thread_info(void)
 {
 	struct thread_info *ti;
-	ti = (void *)(percpu_read_stable(kernel_stack) +
+	ti = (void *)(this_cpu_read_stable(kernel_stack) +
 		      KERNEL_STACK_OFFSET - THREAD_SIZE);
 	return ti;
 }
-- 
1.6.3.3

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