]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
powerpc: Update DSCR on all CPUs when writing sysfs dscr_default
authorAnton Blanchard <anton@samba.org>
Mon, 3 Sep 2012 16:47:56 +0000 (16:47 +0000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 5 Sep 2012 06:05:20 +0000 (16:05 +1000)
commit1b6ca2a6fe56e7697d57348646e07df08f43b1bb
treee6002bbd58816dfe10b639e2843c804b5dad18c3
parent375f561a4131a0f501c8845a2a20f2ca1abc8f7a
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>
arch/powerpc/kernel/sysfs.c