From: Simon Kagstrom <simon.kagstrom@netinsight.net>
Date: Thu, 20 Aug 2009 07:19:53 +0000 (+0200)
Subject: [ARM] Orion NAND: Make asm volatile avoid GCC pushing ldrd out of the loop
X-Git-Tag: v2.6.31-rc8~40^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=94da210af4978b94cb70318bd1b282a73c50b175;p=pandora-kernel.git

[ARM] Orion NAND: Make asm volatile avoid GCC pushing ldrd out of the loop

GCC 4.3.3 and 4.4.1 happily moves the dword load instruction out of the
loop in orion_nand_read_buf. This patch makes the instruction volatile
to avoid the issue. I've discussed this at gcc-help, refer to the thread
at

  http://gcc.gnu.org/ml/gcc-help/2009-08/msg00187.html

The early clobber is added to avoid the destination registers and the
source register overlapping.

Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
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