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authorAnton Blanchard <anton@samba.org>2012-09-03 16:47:56 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-12-17 10:49:05 -0800
commit1758e55fd05e042e873f6d54657552ee1730bb32 (patch)
treef38b64de33726999219a359869067db9b88b5482 /drivers/video/intelfb
parent7a09a2fff84eda4ac1bba98a61a61bd58f369bed (diff)
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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/intelfb')
0 files changed, 0 insertions, 0 deletions