stop_machine: struct cpu_stopper, remove alignment padding on 64 bits
Richard Kennedy [Tue, 10 Aug 2010 00:20:34 +0000 (17:20 -0700)]
Reorder elements in structure cpu_stopper to remove alignment padding on
64 bit builds, this shrinks its size from 40 to 32 bytes saving 8 bytes
per cpu.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/stop_machine.c

index 70f8d90..4372ccb 100644 (file)
@@ -35,9 +35,9 @@ struct cpu_stop_done {
 /* the actual stopper, one per every possible cpu, enabled on online cpus */
 struct cpu_stopper {
        spinlock_t              lock;
+       bool                    enabled;        /* is this stopper enabled? */
        struct list_head        works;          /* list of pending works */
        struct task_struct      *thread;        /* stopper thread */
-       bool                    enabled;        /* is this stopper enabled? */
 };
 
 static DEFINE_PER_CPU(struct cpu_stopper, cpu_stopper);