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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-12 12:50:21 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 13:22:05 +1100 |
| commit | 5747230645562921b5bc19f6409f7af08fe17c6d (patch) | |
| tree | 159d06a6af15fb4d91d917648b9f2904607a982e /arch/powerpc/kernel/misc_32.S | |
| parent | powerpc/32: Use fast instruction to set MSR RI in exception prolog on 8xx (diff) | |
| download | linux-dev-5747230645562921b5bc19f6409f7af08fe17c6d.tar.xz linux-dev-5747230645562921b5bc19f6409f7af08fe17c6d.zip | |
powerpc/32: Remove ksp_limit
ksp_limit is there to help detect stack overflows.
That is specific to ppc32 as it was removed from ppc64 in
commit cbc9565ee826 ("powerpc: Remove ksp_limit on ppc64").
There are other means for detecting stack overflows.
As ppc64 has proven to not need it, ppc32 should be able to do
without it too.
Lets remove it and simplify exception handling.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d789c3385b22e07bedc997613c0d26074cb513e7.1615552866.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/misc_32.S')
| -rw-r--r-- | arch/powerpc/kernel/misc_32.S | 14 |
1 files changed, 0 insertions, 14 deletions
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S index 717e658b90fd..acc410043b96 100644 --- a/arch/powerpc/kernel/misc_32.S +++ b/arch/powerpc/kernel/misc_32.S @@ -27,23 +27,14 @@ .text -/* - * We store the saved ksp_limit in the unused part - * of the STACK_FRAME_OVERHEAD - */ _GLOBAL(call_do_softirq) mflr r0 stw r0,4(r1) - lwz r10,THREAD+KSP_LIMIT(r2) - stw r3, THREAD+KSP_LIMIT(r2) stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r3) mr r1,r3 - stw r10,8(r1) bl __do_softirq - lwz r10,8(r1) lwz r1,0(r1) lwz r0,4(r1) - stw r10,THREAD+KSP_LIMIT(r2) mtlr r0 blr @@ -53,16 +44,11 @@ _GLOBAL(call_do_softirq) _GLOBAL(call_do_irq) mflr r0 stw r0,4(r1) - lwz r10,THREAD+KSP_LIMIT(r2) - stw r4, THREAD+KSP_LIMIT(r2) stwu r1,THREAD_SIZE-STACK_FRAME_OVERHEAD(r4) mr r1,r4 - stw r10,8(r1) bl __do_irq - lwz r10,8(r1) lwz r1,0(r1) lwz r0,4(r1) - stw r10,THREAD+KSP_LIMIT(r2) mtlr r0 blr |