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| author |   Anton Blanchard <anton@samba.org> | 2012-09-03 16:47:56 +0000 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-09-05 16:05:20 +1000 |
| commit | 1b6ca2a6fe56e7697d57348646e07df08f43b1bb (patch) | |
| tree | e6002bbd58816dfe10b639e2843c804b5dad18c3 /lib/mpi/mpi-bit.c | |
| parent | powerpc/powernv: Always go into nap mode when CPU is offline (diff) | |
| download | linux-dev-1b6ca2a6fe56e7697d57348646e07df08f43b1bb.tar.xz linux-dev-1b6ca2a6fe56e7697d57348646e07df08f43b1bb.zip | |
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>
Diffstat (limited to 'lib/mpi/mpi-bit.c')
0 files changed, 0 insertions, 0 deletions