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| author | Anton Blanchard <anton@samba.org> | 2012-09-03 16:47:56 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-12-17 10:49:05 -0800 |
| commit | 1758e55fd05e042e873f6d54657552ee1730bb32 (patch) | |
| tree | f38b64de33726999219a359869067db9b88b5482 /drivers/video/s3c2410fb.c | |
| parent | 7a09a2fff84eda4ac1bba98a61a61bd58f369bed (diff) | |
| download | kernel_samsung_smdk4412-1758e55fd05e042e873f6d54657552ee1730bb32.tar.gz kernel_samsung_smdk4412-1758e55fd05e042e873f6d54657552ee1730bb32.tar.bz2 kernel_samsung_smdk4412-1758e55fd05e042e873f6d54657552ee1730bb32.zip | |
powerpc: Update DSCR on all CPUs when writing sysfs dscr_default
commit 1b6ca2a6fe56e7697d57348646e07df08f43b1bb upstream.
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>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/video/s3c2410fb.c')
0 files changed, 0 insertions, 0 deletions