tree e6002bbd58816dfe10b639e2843c804b5dad18c3
parent 375f561a4131a0f501c8845a2a20f2ca1abc8f7a
author Anton Blanchard <anton@samba.org> 1346690876 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1346825120 +1000

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>