diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-02-08 15:10:34 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-11 23:35:11 +1100 |
| commit | 4d67facbcbdb3d9e3c9cb82e4ec47fc63d298dd8 (patch) | |
| tree | bc4fcd1888bd1bd6089c5d72bd3200f800cb2340 /arch/powerpc/kernel/head_32.h | |
| parent | 6f76a01173ccaa363739f913394d4e138d92d718 (diff) | |
powerpc/32: Remove verification of MSR_PR on syscall in the ASM entry
system_call_exception() checks MSR_PR and BUGs if a syscall
is issued from kernel mode.
No need to handle it anymore from the ASM entry code.
null_syscall reduction 2 cycles (348 => 346 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/1eddb42cb12092b1e3d72608d182c365db3da41d.1612796617.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/head_32.h')
| -rw-r--r-- | arch/powerpc/kernel/head_32.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h index af4978e9d50d..0e0e7b5b93ab 100644 --- a/arch/powerpc/kernel/head_32.h +++ b/arch/powerpc/kernel/head_32.h @@ -118,8 +118,6 @@ .macro SYSCALL_ENTRY trapno mfspr r9, SPRN_SRR1 mfspr r10, SPRN_SRR0 - andi. r11, r9, MSR_PR - beq- 99f LOAD_REG_IMMEDIATE(r11, MSR_KERNEL) /* can take exceptions */ lis r12, 1f@h ori r12, r12, 1f@l @@ -174,7 +172,6 @@ 3: #endif b transfer_to_syscall /* jump to handler */ -99: b ret_from_kernel_syscall .endm .macro save_dar_dsisr_on_stack reg1, reg2, sp |