---

yaml
---
r: 204683
b: refs/heads/master
c: 06532a6
h: refs/heads/master
i:
  204681: 7d9aa74
  204679: 93f070d
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2538c2d08f46141550a1e68819efa8fe31c6e3dc
+refs/heads/master: 06532a6743d83fac4b79389fc8c86c88cb4e3302

trunk/arch/powerpc/include/asm/hw_breakpoint.h

@@ -65,9 +65,12 @@ static inline void hw_breakpoint_disable(void)
 {
 	set_dabr(0);
 }
+extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
 
 #else	/* CONFIG_HAVE_HW_BREAKPOINT */
 static inline void hw_breakpoint_disable(void) { }
+static inline void thread_change_pc(struct task_struct *tsk,
+					struct pt_regs *regs) { }
 #endif	/* CONFIG_HAVE_HW_BREAKPOINT */
 #endif	/* __KERNEL__ */
 #endif	/* _PPC_BOOK3S_64_HW_BREAKPOINT_H */

trunk/arch/powerpc/kernel/hw_breakpoint.c

@@ -174,6 +174,24 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
 	return 0;
 }
 
+/*
+ * Restores the breakpoint on the debug registers.
+ * Invoke this function if it is known that the execution context is
+ * about to change to cause loss of MSR_SE settings.
+ */
+void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs)
+{
+	struct arch_hw_breakpoint *info;
+
+	if (likely(!tsk->thread.last_hit_ubp))
+		return;
+
+	info = counter_arch_bp(tsk->thread.last_hit_ubp);
+	regs->msr &= ~MSR_SE;
+	set_dabr(info->address | info->type | DABR_TRANSLATION);
+	tsk->thread.last_hit_ubp = NULL;
+}
+
 /*
  * Handle debug exception notifications.
  */

trunk/arch/powerpc/kernel/signal.c

@@ -11,6 +11,7 @@
 
 #include <linux/tracehook.h>
 #include <linux/signal.h>
+#include <asm/hw_breakpoint.h>
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
 
@@ -149,6 +150,8 @@ static int do_signal_pending(sigset_t *oldset, struct pt_regs *regs)
 	if (current->thread.dabr)
 		set_dabr(current->thread.dabr);
 #endif
+	/* Re-enable the breakpoints for the signal stack */
+	thread_change_pc(current, regs);
 
 	if (is32) {
         	if (ka.sa.sa_flags & SA_SIGINFO)