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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-02-08 18:10:32 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-11 15:35:11 +0300 |
| commit | fbcee2ebe8edbb6a93316f0a189ae7fcfaa7094f (patch) | |
| tree | ba1d5090e231ad571ce2c120059f08613e2c6b69 /arch/powerpc/kernel/head_booke.h | |
| parent | c01b916658150e98f00a4981750c37a3224c8735 (diff) | |
| download | linux-fbcee2ebe8edbb6a93316f0a189ae7fcfaa7094f.tar.xz | |
powerpc/32: Always save non volatile GPRs at syscall entry
In preparation for porting syscall entry/exit to C, inconditionally
save non volatile general purpose registers.
Commit 965dd3ad3076 ("powerpc/64/syscall: Remove non-volatile GPR save
optimisation") provides detailed explanation.
This increases the number of cycles by 24 cycles on 8xx with
null_syscall benchmark (280 => 304 cycles)
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/21c08162b83655195fe9ead78ff2cfd28508d023.1612796617.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/head_booke.h')
| -rw-r--r-- | arch/powerpc/kernel/head_booke.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h index b3c502c503a0..626e716576ce 100644 --- a/arch/powerpc/kernel/head_booke.h +++ b/arch/powerpc/kernel/head_booke.h @@ -124,7 +124,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV) stw r2,GPR2(r11) addi r12, r12, STACK_FRAME_REGS_MARKER@l stw r9,_MSR(r11) - li r2, \trapno + 1 + li r2, \trapno stw r12, 8(r11) stw r2,_TRAP(r11) SAVE_GPR(0, r11) |