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

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Message-ID: <20130322114624.GI26183@in.ibm.com>
Date:	Fri, 22 Mar 2013 17:16:24 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	oleg@...hat.com, Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	benh@...nel.crashing.org, ppcdev <linuxppc-dev@...ts.ozlabs.org>
Subject: [PATCH 3/3] uprobes/powerpc: ignore trap variants during register

From: Ananth N Mavinakayanahalli <ananth@...ibm.com>

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@...ibm.com>
---
 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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