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| author |   Nicholas Piggin <npiggin@gmail.com> | 2020-02-26 03:35:38 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-04-01 13:42:14 +1100 |
| commit | 702f0980522239bc7fd1360b24f722a90b6b4418 (patch) | |
| tree | 9345ee57b7a02a9fbc220c3e527f6808c3f6d7fe /arch/powerpc/kernel/entry_64.S | |
| parent | powerpc/64s: Implement interrupt exit logic in C (diff) | |
| download | linux-dev-702f0980522239bc7fd1360b24f722a90b6b4418.tar.xz linux-dev-702f0980522239bc7fd1360b24f722a90b6b4418.zip | |
powerpc/64s/exception: Remove lite interrupt return
Regular interrupt return restores NVGPRS whereas lite returns do not.
This is clumsy: most interrupts can return without restoring NVGPRS in
most of the time, but there are special cases that require it (when
registers have been modified by the kernel). So change interrupt
return to not restore NVGPRS, and have interrupt handlers restore them
explicitly in the cases that requires it.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200225173541.1549955-30-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 5d782acb86d4..95905ed3d86e 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -479,12 +479,6 @@ _ASM_NOKPROBE_SYMBOL(fast_interrupt_return) .globl interrupt_return interrupt_return: _ASM_NOKPROBE_SYMBOL(interrupt_return) - REST_NVGPRS(r1) - - .balign IFETCH_ALIGN_BYTES - .globl interrupt_return_lite -interrupt_return_lite: -_ASM_NOKPROBE_SYMBOL(interrupt_return_lite) ld r4,_MSR(r1) andi. r0,r4,MSR_PR beq .Lkernel_interrupt_return |