From: Chris Metcalf <cmetcalf@tilera.com>
Date: Sun, 29 May 2011 10:55:44 +0000 (+0000)
Subject: ip_options_compile: properly handle unaligned pointer
X-Git-Tag: v3.0-rc2~7^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=48bdf072c3f1f8f739f76d19c74f4c79605cac46;p=pandora-kernel.git

ip_options_compile: properly handle unaligned pointer

The current code takes an unaligned pointer and does htonl() on it to
make it big-endian, then does a memcpy().  The problem is that the
compiler decides that since the pointer is to a __be32, it is legal
to optimize the copy into a processor word store.  However, on an
architecture that does not handled unaligned writes in kernel space,
this produces an unaligned exception fault.

The solution is to track the pointer as a "char *" (which removes a bunch
of unpleasant casts in any case), and then just use put_unaligned_be32()
to write the value to memory.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: David S. Miller <davem@zippy.davemloft.net>
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