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author | Sam bobroff <sam.bobroff@au1.ibm.com> | 2014-05-21 16:32:38 +1000 |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-05-28 13:35:40 +1000 |
commit | 1739ea9e13e636590dd56c2f4ca85e783da512e7 (patch) | |
tree | fcdebf258849e18544f05cdabcf176837c0b3778 /Documentation | |
parent | 39a360ef7234942333436709fd6cf641d5c51b7b (diff) | |
download | linux-stable-1739ea9e13e636590dd56c2f4ca85e783da512e7.tar.gz linux-stable-1739ea9e13e636590dd56c2f4ca85e783da512e7.tar.bz2 linux-stable-1739ea9e13e636590dd56c2f4ca85e783da512e7.zip |
powerpc: Fix regression of per-CPU DSCR setting
Since commit "efcac65 powerpc: Per process DSCR + some fixes (try#4)"
it is no longer possible to set the DSCR on a per-CPU basis.
The old behaviour was to minipulate the DSCR SPR directly but this is no
longer sufficient: the value is quickly overwritten by context switching.
This patch stores the per-CPU DSCR value in a kernel variable rather than
directly in the SPR and it is used whenever a process has not set the DSCR
itself. The sysfs interface (/sys/devices/system/cpu/cpuN/dscr) is unchanged.
Writes to the old global default (/sys/devices/system/cpu/dscr_default)
now set all of the per-CPU values and reads return the last written value.
The new per-CPU default is added to the paca_struct and is used everywhere
outside of sysfs.c instead of the old global default.
Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions