[PATCH 3/3] uprobes/powerpc: ignore trap variants during register

From: Ananth N Mavinakayanahalli
Date: Fri Mar 22 2013 - 07:46:39 EST

From: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>

The current implementation of uprobes assumes that uprobes always wins
even when a register request is at a location with a conditional
breakpoint by some other entity. Refer to [1] for more details.

Remove the breakpoint instruction check during registration on powerpc,
so that uprobes behavior on powerpc matches that of x86.

[1] https://lists.ozlabs.org/pipermail/linuxppc-dev/2013-March/104771.html

Signed-off-by: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
arch/powerpc/kernel/uprobes.c | 6 ------
1 file changed, 6 deletions(-)

Index: linux-3.9-rc3/arch/powerpc/kernel/uprobes.c
--- linux-3.9-rc3.orig/arch/powerpc/kernel/uprobes.c
+++ linux-3.9-rc3/arch/powerpc/kernel/uprobes.c
@@ -53,12 +53,6 @@ int arch_uprobe_analyze_insn(struct arch
if (addr & 0x03)
return -EINVAL;

- /*
- * We currently don't support a uprobe on an already
- * existing breakpoint instruction underneath
- */
- if (is_trap(auprobe->ainsn))
- return -ENOTSUPP;
return 0;

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