tree 54fee24502e5c8ce2f0a96ef1b5fd62bef2dfc73
parent 00ca0de02f80924dfff6b4f630e1dff3db005e35
author Anton Blanchard <anton@samba.org> 1346690987 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1346825121 +1000

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>