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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

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 */
 };
 


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/