From f7b64fe806029e0a0454df132eec3c5ab576102c Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Thu, 29 Oct 2009 22:34:15 +0900
Subject: [PATCH] percpu: make access macros universal
Now that per_cpu__ prefix is gone, there's no distinction between
static and dynamic percpu variables. Make get_cpu_var() take dynamic
percpu variables and ensure that all macros have parentheses around
the parameter evaluation and evaluate the variable parameter only once
such that any expression which evaluates to percpu address can be used
safely.
Signed-off-by: Tejun Heo <tj@kernel.org>
---
include/linux/percpu.h | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index e12410e55e05..f965f833a643 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -27,10 +27,13 @@
* we force a syntax error here if it isn't.
*/
#define get_cpu_var(var) (*({ \
- extern int simple_identifier_##var(void); \
preempt_disable(); \
&__get_cpu_var(var); }))
-#define put_cpu_var(var) preempt_enable()
+
+#define put_cpu_var(var) do { \
+ (void)(var); \
+ preempt_enable(); \
+} while (0)
#ifdef CONFIG_SMP
@@ -182,17 +185,19 @@ static inline void *pcpu_lpage_remapped(void *kaddr)
#ifndef percpu_read
# define percpu_read(var) \
({ \
- typeof(var) __tmp_var__; \
- __tmp_var__ = get_cpu_var(var); \
- put_cpu_var(var); \
- __tmp_var__; \
+ typeof(var) *pr_ptr__ = &(var); \
+ typeof(var) pr_ret__; \
+ pr_ret__ = get_cpu_var(*pr_ptr__); \
+ put_cpu_var(*pr_ptr__); \
+ pr_ret__; \
})
#endif
#define __percpu_generic_to_op(var, val, op) \
do { \
- get_cpu_var(var) op val; \
- put_cpu_var(var); \
+ typeof(var) *pgto_ptr__ = &(var); \
+ get_cpu_var(*pgto_ptr__) op val; \
+ put_cpu_var(*pgto_ptr__); \
} while (0)
#ifndef percpu_write
@@ -304,7 +309,7 @@ do { \
#define _this_cpu_generic_to_op(pcp, val, op) \
do { \
preempt_disable(); \
- *__this_cpu_ptr(&pcp) op val; \
+ *__this_cpu_ptr(&(pcp)) op val; \
preempt_enable(); \
} while (0)
--
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