Subject: [PATCH v2 1/4] kprobes/powerpc: Do not disable External interrupts during single step

From: "Suzuki K. Poulose" <[email-masked]>
Date: Mon, 03 Dec 2012 20:37:42 +0530

From: Suzuki K. Poulose <[email-masked]>

External/Decrement exceptions have lower priority than the Debug Exception.
So, we don't have to disable the External interrupts before a single step.
However, on BookE, Critical Input Exception(CE) has higher priority than a
Debug Exception. Hence we mask them.

Signed-off-by: 	Suzuki K. Poulose <[email-masked]>
Cc:		Sebastian Andrzej Siewior <[email-masked]>
Cc:		Ananth N Mavinakaynahalli <[email-masked]>
Cc:		Kumar Gala <[email-masked]>
Cc:		[email-masked]
---
 arch/powerpc/kernel/kprobes.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
index e88c643..4901b34 100644
--- a/arch/powerpc/kernel/kprobes.c
+++ b/arch/powerpc/kernel/kprobes.c
@@ -104,13 +104,13 @@ void __kprobes arch_remove_kprobe(struct kprobe *p)
 
 static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
 {
-	/* We turn off async exceptions to ensure that the single step will
-	 * be for the instruction we have the kprobe on, if we dont its
-	 * possible we'd get the single step reported for an exception handler
-	 * like Decrementer or External Interrupt */
-	regs->msr &= ~MSR_EE;
 	regs->msr |= MSR_SINGLESTEP;
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
+	/* 
+	 * We turn off Critical Input Exception(CE) to ensure that the single
+	 * step will be for the instruction we have the probe on; if we don't,
+	 * it is possible we'd get the single step reported for CE.
+	 */
 	regs->msr &= ~MSR_CE;
 	mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
 #ifdef CONFIG_PPC_47x