From: Anton Blanchard <anton@samba.org>
Date: Mon, 3 Sep 2012 16:49:47 +0000 (+0000)
Subject: powerpc: Fix DSCR inheritance in copy_thread()
X-Git-Tag: v3.6-rc5~13^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1021cb268b3025573c4811f1dee4a11260c4507b;p=pandora-kernel.git

powerpc: Fix DSCR inheritance in copy_thread()

If the default DSCR is non zero we set thread.dscr_inherit in
copy_thread() meaning the new thread and all its children will ignore
future updates to the default DSCR. This is not intended and is
a change in behaviour that a number of our users have hit.

We just need to inherit thread.dscr and thread.dscr_inherit from
the parent which ends up being much simpler.

This was found with the following test case:

http://ozlabs.org/~anton/junkcode/dscr_default_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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