From: Scott Wood <scottwood@freescale.com>
Date: Thu, 22 May 2014 21:10:35 +0000 (-0500)
Subject: powerpc/e6500: hw tablewalk: fix recursive tlb lock on cpu 0
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~134^2~95
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1cb4ed92f6a5a8961b122d11e651870ba741245b;p=pandora-kernel.git

powerpc/e6500: hw tablewalk: fix recursive tlb lock on cpu 0

Commit 82d86de25b9c99db546e17c6f7ebf9a691da557e "TLB lock recursive"
introduced a bug whereby cpu 0 uses the same value for "lock held" as
is used to indicate that the lock is free.  This means that cpu 1 can
acquire the lock whenever it wants, regardless of whether cpu 0 has it
locked, which in turn means we can get duplicate TLB entries.

Add one to the CPU value to ensure we do not use zero as a "lock held"
value.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Reported-by: Ed Swarthout <ed.swarthout@freescale.com>
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