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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-02-08 18:10:34 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-11 15:35:11 +0300 |
| commit | 4d67facbcbdb3d9e3c9cb82e4ec47fc63d298dd8 (patch) | |
| tree | bc4fcd1888bd1bd6089c5d72bd3200f800cb2340 /arch/powerpc/kernel/head_booke.h | |
| parent | 6f76a01173ccaa363739f913394d4e138d92d718 (diff) | |
| download | linux-4d67facbcbdb3d9e3c9cb82e4ec47fc63d298dd8.tar.xz | |
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_booke.h')
| -rw-r--r-- | arch/powerpc/kernel/head_booke.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h index db931f1167aa..bfbd240cc8a2 100644 --- a/arch/powerpc/kernel/head_booke.h +++ b/arch/powerpc/kernel/head_booke.h @@ -106,10 +106,8 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV) #endif mfspr r9, SPRN_SRR1 BOOKE_CLEAR_BTB(r11) - andi. r11, r9, MSR_PR lwz r11, TASK_STACK - THREAD(r10) rlwinm r12,r12,0,4,2 /* Clear SO bit in CR */ - beq- 99f ALLOC_STACK_FRAME(r11, THREAD_SIZE - INT_FRAME_SIZE) stw r12, _CCR(r11) /* save various registers */ mflr r12 @@ -155,7 +153,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV) 3: b transfer_to_syscall /* jump to handler */ -99: b ret_from_kernel_syscall .endm /* To handle the additional exception priority levels on 40x and Book-E |