From: Michael Ellerman <michael@ellerman.id.au>
Date: Mon, 20 Feb 2012 21:32:30 +0000 (+0000)
Subject: powerpc: Fix program check handling when lockdep is enabled
X-Git-Tag: v3.3-rc5~19^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=922b9f86a020258d3ea3bfed27251efaed7a03a3;p=pandora-kernel.git

powerpc: Fix program check handling when lockdep is enabled

In commit 54321242afe ("Disable interrupts early in Program Check"), we
switched from enabling to disabling interrupts in program_check_common.

Whereas ENABLE_INTS leaves r3 untouched, if lockdep is enabled DISABLE_INTS
calls into lockdep code and will clobber r3. That means we pass a bogus
struct pt_regs* into program_check_exception() and all hell breaks loose.

So load our regs pointer into r3 after we call DISABLE_INTS.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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