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

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>

diff --git a/arch/powerpc/kernel/optprobes_head.S b/arch/powerpc/kernel/optprobes_head.S
index 4937bef..52fc864 100644 (file)
--- 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)