The patch titled
stop_machine: struct cpu_stopper, remove alignment padding on 64 bits
has been added to the -mm tree. Its filename is
stop_machine-struct-cpu_stopper-remove-alignment-padding-on-64-bits.patch
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------------------------------------------------------
Subject: stop_machine: struct cpu_stopper, remove alignment padding on 64 bits
From: Richard Kennedy <richard@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/stop_machine.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN kernel/stop_machine.c~stop_machine-struct-cpu_stopper-remove-alignment-padding-on-64-bits kernel/stop_machine.c
--- a/kernel/stop_machine.c~stop_machine-struct-cpu_stopper-remove-alignment-padding-on-64-bits
+++ a/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);
_
Patches currently in -mm which might be from richard@xxxxxxxxxxxxxxx are
origin.patch
linux-next.patch
timer_list-remove-alignment-padding-on-64-bit-when-config_timer_stats.patch
buffer_head-remove-redundant-test-from-wait_on_buffer.patch
writeback-reduce-calls-to-global_page_state-in-balance_dirty_pages.patch
stop_machine-struct-cpu_stopper-remove-alignment-padding-on-64-bits.patch
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