From: Richard Kennedy <richard@rsk.demon.co.uk>
Date: Wed, 20 Oct 2010 22:57:30 +0000 (-0700)
Subject: timer_list: Remove alignment padding on 64 bit when CONFIG_TIMER_STATS
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d0959024d8fb6555ba8bfdc6624cc7b7c2e675fd;p=openwrt%2Fstaging%2Fblogic.git

timer_list: Remove alignment padding on 64 bit when CONFIG_TIMER_STATS

Reorder struct timer_list to remove 8 bytes of alignment padding on 64
bit builds when CONFIG_TIMER_STATS is selected.

timer_list is widely used across the kernel so many structures will
benefit and shrink in size.

For example, with my config on x86_64
	per_cpu_dm_data shrinks from 136 to 128 bytes
and
	ahci_port_priv shrinks from 1032 to 968 bytes.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/include/linux/timer.h b/include/linux/timer.h
index 38cf093ef62c..f3dccdb44f95 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -24,9 +24,9 @@ struct timer_list {
 	int slack;
 
 #ifdef CONFIG_TIMER_STATS
+	int start_pid;
 	void *start_site;
 	char start_comm[16];
-	int start_pid;
 #endif
 #ifdef CONFIG_LOCKDEP
 	struct lockdep_map lockdep_map;