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| author |   Nicholas Piggin <npiggin@gmail.com> | 2021-01-30 23:08:20 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-02-09 00:02:09 +1100 |
| commit | 73d7a97914f23397b012e851f6a1fe4061923a82 (patch) | |
| tree | 5852141852c3e55d503b75b8666afbcbb4b57ab7 /arch/powerpc/kernel/entry_32.S | |
| parent | powerpc: DebugException remove args (diff) | |
| download | linux-dev-73d7a97914f23397b012e851f6a1fe4061923a82.tar.xz linux-dev-73d7a97914f23397b012e851f6a1fe4061923a82.zip | |
powerpc/32: transfer can avoid saving r4/r5 over trace call
Now that handlers get all registers from pt_regs, r4 and r5 are no
longer live here and may be clobbered.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210130130852.2952424-11-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 238eacfda7b0..d6ea3f2d6cc0 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -276,8 +276,7 @@ reenable_mmu: * We save a bunch of GPRs, * r3 can be different from GPR3(r1) at this point, r9 and r11 * contains the old MSR and handler address respectively, - * r4 & r5 can contain page fault arguments that need to be passed - * along as well. r0, r6-r8, r12, CCR, CTR, XER etc... are left + * r0, r4-r8, r12, CCR, CTR, XER etc... are left * clobbered as they aren't useful past this point. */ @@ -285,15 +284,11 @@ reenable_mmu: stw r9,8(r1) stw r11,12(r1) stw r3,16(r1) - stw r4,20(r1) - stw r5,24(r1) /* If we are disabling interrupts (normal case), simply log it with * lockdep */ 1: bl trace_hardirqs_off - lwz r5,24(r1) - lwz r4,20(r1) lwz r3,16(r1) lwz r11,12(r1) lwz r9,8(r1) |