From: Anton Blanchard <anton@samba.org>
Date: Mon, 3 Sep 2012 16:47:56 +0000 (+0000)
Subject: powerpc: Update DSCR on all CPUs when writing sysfs dscr_default
X-Git-Tag: v3.6-rc5~13^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b6ca2a6fe56e7697d57348646e07df08f43b1bb;p=pandora-kernel.git

powerpc: Update DSCR on all CPUs when writing sysfs dscr_default

Writing to dscr_default in sysfs doesn't actually change the DSCR -
we rely on a context switch on each CPU to do the work. There is no
guarantee we will get a context switch in a reasonable amount of time
so fire off an IPI to force an immediate change.

This issue was found with the following test case:

http://ozlabs.org/~anton/junkcode/dscr_explicit_test.c

Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: <stable@kernel.org> # 3.0+
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

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