From: Jonas Bonn <jonas@southpole.se>
Date: Wed, 18 Apr 2012 10:23:39 +0000 (+0200)
Subject: openrisc: use scratch regs in atomic syscall
X-Git-Tag: v3.5-rc1~175^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=207e715ff17b42e022df107210dc8c736a703eb3;p=pandora-kernel.git

openrisc: use scratch regs in atomic syscall

The function sys_or1k_atomic was using call-saved registers without
restoring their value before returning.  This is a faux pas: either
we need to restore their values or use scratch regs; the latter is
less code so that's the route this patch takes.

Thanks to David Hennerström for doing most of the heavy-lifting in
tracking this one down.

Reported-by: Davd Hennerström <david.hennerstrom@aacmicrotec.com>
Signed-off-by: Jonas Bonn <jonas@southpole.se>
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