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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2008-08-17 23:50:36 +0400
committerIngo Molnar <mingo@elte.hu>2008-08-18 11:45:22 +0400
commitded00a56e99555c3f4000ef3eebfd5fe0d574565 (patch)
tree384e81f0780de2fb89a82dd341cb24ce2f4364cf /include/linux/compiler.h
parentcd95851785bcfe95fdf73689e8ecb5a1c5959231 (diff)
downloadlinux-ded00a56e99555c3f4000ef3eebfd5fe0d574565.tar.xz
rcu: remove redundant ACCESS_ONCE definition from rcupreempt.c
Remove the redundant definition of ACCESS_ONCE() from rcupreempt.c in favor of the one in compiler.h. Also merge the comment header from rcupreempt.c's definition into that in compiler.h. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/compiler.h')
-rw-r--r--include/linux/compiler.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index c8bd2daf95ec..8322141ee480 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -190,7 +190,9 @@ extern void __chk_io_ptr(const volatile void __iomem *);
* ACCESS_ONCE() in different C statements.
*
* This macro does absolutely -nothing- to prevent the CPU from reordering,
- * merging, or refetching absolutely anything at any time.
+ * merging, or refetching absolutely anything at any time. Its main intended
+ * use is to mediate communication between process-level code and irq/NMI
+ * handlers, all running on the same CPU.
*/
#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))