From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH] powerpc/kprobes: Don't save/restore DAR/DSISR to/from pt_regs for optprobes
Date: Fri, 9 Jun 2017 00:46:55 +0530 [thread overview]
Message-ID: <20170608191655.19469-1-naveen.n.rao@linux.vnet.ibm.com> (raw)
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>
---
arch/powerpc/kernel/optprobes_head.S | 8 --------
1 file changed, 8 deletions(-)
diff --git a/arch/powerpc/kernel/optprobes_head.S b/arch/powerpc/kernel/optprobes_head.S
index 4937bef7652f..52fc864cdec4 100644
--- a/arch/powerpc/kernel/optprobes_head.S
+++ b/arch/powerpc/kernel/optprobes_head.S
@@ -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)
--
2.12.2
next reply other threads:[~2017-06-08 19:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-08 19:16 Naveen N. Rao [this message]
2017-08-31 11:35 ` powerpc/kprobes: Don't save/restore DAR/DSISR to/from pt_regs for optprobes Michael Ellerman
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