linux-kernel - [PATCH] xfs: #define out unused parameters for seven functions in xfs

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Date:	Tue, 22 Apr 2008 13:51:03 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	David Chinner <dgc@....com>
Cc:	Eric Sandeen <sandeen@...deen.net>, Adrian Bunk <bunk@...nel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Shawn Bohrer <shawn.bohrer@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] xfs: #define out unused parameters for seven functions in xfs_trans.h

[ resend: now with patch attached! :) ]

Hi David,

Seven xfs_trans_XXX functions declared in xfs_trans.h
are not using "tp" parameter in non-debug builds,
but it still takes stack space since these functions
are not static and gcc cannot optimize it out.

This patch removes these parameters using #define hack
which makes them "disappear" without the need of uglifying
every callsite with #ifdefs.

Code size difference on 32-bit x86:
 393441    2904    2952  399297   617c1 linux-2.6-xfs7-TEST/fs/xfs/xfs.o
 393289    2904    2952  399145   61729 linux-2.6-xfs8-TEST/fs/xfs/xfs.o

Compile tested only.

Signed-off-by: Denys Vlasenko <vda.linux@...glemail.com>
--
vda

View attachment "xfs6-xfs_trans.h-remove_unused_params.patch" of type "text/x-diff" (2631 bytes)