diff options
| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2008-08-17 12:50:36 -0700 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-08-18 09:45:22 +0200 |
| commit | ded00a56e99555c3f4000ef3eebfd5fe0d574565 (patch) | |
| tree | 384e81f0780de2fb89a82dd341cb24ce2f4364cf /include/linux/compiler.h | |
| parent | rcu: fix classic RCU locking cleanup lockdep problem (diff) | |
| download | linux-dev-ded00a56e99555c3f4000ef3eebfd5fe0d574565.tar.xz linux-dev-ded00a56e99555c3f4000ef3eebfd5fe0d574565.zip | |
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.h | 4 |
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)) |