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Commit ded00a56 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Ingo Molnar
Browse files

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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent cd958517

include/linux/compiler.h

+3 −1
Original line number Diff line number Diff line
@@ -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))

kernel/rcupreempt.c

+0 −8
Original line number Diff line number Diff line
@@ -58,14 +58,6 @@ 
#include <linux/cpumask.h>

#include <linux/rcupreempt_trace.h>



/*

 * Macro that prevents the compiler from reordering accesses, but does

 * absolutely -nothing- to prevent CPUs from reordering.  This is used

 * only to mediate communication between mainline code and hardware

 * interrupt and NMI handlers.

 */

#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))



/*

 * PREEMPT_RCU data structures.

 */