From 725fb29fd4bcda958b32f4479ad9934117c22019 Mon Sep 17 00:00:00 2001
From: Kumar Gala <galak@kernel.crashing.org>
Date: Fri, 9 Nov 2007 03:51:14 -0600
Subject: [PATCH] [POWERPC] Fix oops related to 4xx flush_tlb_page modification

kmap_atomic calls flush_tlb_page with a NULL VMA and thus we end
up dereferencing a NULL pointer to try and get the context.id.

If the VMA is null use the global pid value of 0.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
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