diff options
| author | Anton Blanchard <anton@samba.org> | 2012-04-04 18:24:29 (GMT) |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-04-30 05:34:44 (GMT) |
| commit | 823df43552da39fd48a2dd74949363a1c8cf62bb (patch) | |
| tree | 6528a931fade61d09a5a83951906cb6dcbaf33f9 /COPYING | |
| parent | d14299dec74a094b0f26b0893eccf8aefdfbd007 (diff) | |
| download | linux-fsl-qoriq-823df43552da39fd48a2dd74949363a1c8cf62bb.tar.xz | |
powerpc: No need to save XER in a system call
The XER is a volatile register so there is no need to save and restore
it over a system call - zero it out in the exception stack frame
instead.
This should fix a 5 cycle stall of the mfxer/std seen on POWER7.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'COPYING')
0 files changed, 0 insertions, 0 deletions