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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-04-30 12:39:02 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-05-03 01:20:27 +1000 |
| commit | b86fb88855ea7881314b935df1df6b1ef1bd0c32 (patch) | |
| tree | e2207487af1b98d66207a533c572f5a8c8aa077f /arch/arc/oprofile | |
| parent | 40530db7c656119b1671aae5bc27811f66f5f424 (diff) | |
| download | linux-b86fb88855ea7881314b935df1df6b1ef1bd0c32.tar.bz2 | |
powerpc/32: implement fast entry for syscalls on non BOOKE
This patch implements a fast entry for syscalls.
Syscalls don't have to preserve non volatile registers except LR.
This patch then implement a fast entry for syscalls, where
volatile registers get clobbered.
As this entry is dedicated to syscall it always sets MSR_EE
and warns in case MSR_EE was previously off
It also assumes that the call is always from user, system calls are
unexpected from kernel.
The overall series improves null_syscall selftest by 12,5% on an 83xx
and by 17% on a 8xx.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/arc/oprofile')
0 files changed, 0 insertions, 0 deletions