From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 14 Mar 2013 17:49:26 +0000 (+0100)
Subject: MIPS: Avoid overoptimization by GCC.
X-Git-Tag: v3.10-rc1~15^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1186e4e904839955e5d2be94f50e0a363cb5651b;p=pandora-kernel.git

MIPS: Avoid overoptimization by GCC.

Without this, it's possible that LTO will discard the calls to
set_except_vector() in the probe for the DADDI overflow bug resulting in a
kernel crash like this:

 [...]
 Mount-cache hash table entries: 256
 Checking for the daddi bug... Integer overflow[#1]:
 Cpu 0
 $ 0   : 0000000000000000 0000000010008ce1 0000000000000001 0000000000000000
 $ 4   : 7fffffffffffedcd ffffffff81410000 0000000000000030 000000000000003f
 [...]

There are other similar places in the kernel so we've just been lucky
that GCC's been tolerant.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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