linux-kernel - lib: reorder prop_local_percpu to remove 64 bit alignment padding

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Message-ID: <1310395114.3058.16.camel@castor.rsk>
Date:	Mon, 11 Jul 2011 15:38:34 +0100
From:	Richard Kennedy <richard@....demon.co.uk>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jens Axboe <jaxboe@...ionio.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: lib: reorder prop_local_percpu to remove 64 bit alignment padding

Reorder prop_local_percpu to remove 8 bytes of alignment padding in 64
bit builds, and therefore shrink backing_dev_info & request_queue by 8
bytes.
    
    
Signed-off-by: Richard Kennedy <richard@....demon.co.uk>

---
patch against v3.0-rc6
compiled & tested on x86_64

I'm not entirely sure which tree this should go through but as it
indirectly removes padding from request_queue I guessed Jens tree?

get_maintainers doesn't know either, it thinks I should send it to
myself :) 


regards
Richard

diff --git a/include/linux/proportions.h b/include/linux/proportions.h
index cf793bb..9168cb0 100644
--- a/include/linux/proportions.h
+++ b/include/linux/proportions.h
@@ -56,8 +56,8 @@ struct prop_local_percpu {
 	/*
 	 * snapshot of the last seen global state
 	 */
-	int shift;
 	unsigned long period;
+	int shift;
 	spinlock_t lock;		/* protect the snapshot state */
 };
 


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