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Subject[PATCH] stop_machine: struct cpu_stopper, remove alignment padding on 64 bits
FromRichard Kennedy <>
DateThu, 05 Aug 2010 12:11:57 +0100
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>
---
patch against 2.6.35
compiled & tested on x86_64
regards
Richard


diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 70f8d90..4372ccb 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -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);



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