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powerpc/kprobes: Don't save/restore DAR/DSISR to/from pt_regs for optprobes

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We don't save/restore these across a trap, or with KPROBES_ON_FTRACE.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Naveen N. Rao 2017-06-09 00:46:55 +05:30 committed by Michael Ellerman
parent a9dadc1c51
commit ec4189c4e8
1 changed files with 0 additions and 8 deletions
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8
arch/powerpc/kernel/optprobes_head.S
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@ -60,10 +60,6 @@ optprobe_template_entry:
std r5,_CCR(r1)
lbz r5,PACASOFTIRQEN(r13)
std r5,SOFTE(r1)
mfdar r5
std r5,_DAR(r1)
mfdsisr r5
std r5,_DSISR(r1)
/*
* We may get here from a module, so load the kernel TOC in r2.
@ -122,10 +118,6 @@ optprobe_template_call_emulate:
mtxer r5
ld r5,_CCR(r1)
mtcr r5
ld r5,_DAR(r1)
mtdar r5
ld r5,_DSISR(r1)
mtdsisr r5
REST_GPR(0,r1)
REST_10GPRS(2,r1)
REST_10GPRS(12,r1)