From: Olaf Hering <olh@suse.de>
Date: Tue, 11 Apr 2006 18:42:08 +0000 (+0200)
Subject: [PATCH] powerpc32: Set cpu explicitly in kernel compiles
X-Git-Tag: v2.6.17-rc2~16^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f48b8296b3152bb45c07c544ce072eaa59dfbc7c;p=pandora-kernel.git

[PATCH] powerpc32: Set cpu explicitly in kernel compiles

Compile the 32bit kernel with -mcpu=powerpc. This reduces the imagesize
when a compiler is used that defaults to -mtune=power4. It inserts lots
of nops to please the 64bit cpu instruction scheduling. But all these nops
are not needed for 32bit kernels.

Example with SLES10 gcc 4.1.0 and arch/powerpc/configs/pmac32_defconfig:

                    vmlinux  vmlinux.strip  vmlinux.gz
 -O2                4980515     4187528      1846829
 -Os                4618801     3827084      1673333
 -O2 -mcpu=powerpc  4738851     3945868      1816253
 -Os -mcpu=powerpc  4532785     3741068      1664688

Signed-off-by: Olaf Hering <olh@suse.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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