Commit 878ae127 authored Aug 09, 2010 by Richard Kennedy Committed by Linus Torvalds Aug 09, 2010

stop_machine: struct cpu_stopper, remove alignment padding on 64 bits

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>

parent d7a7c573

kernel/stop_machine.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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);