From: Kumar Gala <galak@kernel.crashing.org>
Date: Sat, 13 Dec 2008 23:01:37 +0000 (-0600)
Subject: powerpc/fsl-booke: Fix problem with _tlbil_va being interrupted
X-Git-Tag: v2.6.28-rc9~25^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e5e774d8833de1a0037be2384efccadf16935675;p=pandora-kernel.git

powerpc/fsl-booke: Fix problem with _tlbil_va being interrupted

An example calling sequence which we did see:

copy_user_highpage -> kmap_atomic -> flush_tlb_page -> _tlbil_va

We got interrupted after setting up the MAS registers before the
tlbwe and the interrupt handler that caused the interrupt also did
a kmap_atomic (ide code) and thus on returning from the interrupt
the MAS registers no longer contained the proper values.

Since we dont save/restore MAS registers for normal interrupts we
need to disable interrupts in _tlbil_va to ensure atomicity.

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