From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Date: Thu, 14 May 2020 11:17:36 +0000 (+0530)
Subject: powerpc/watchpoint: Introduce is_ptrace_bp() function
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c9e82aeb197df2d93b1b4234bc0c80943fa594e8;p=linux.git

powerpc/watchpoint: Introduce is_ptrace_bp() function

Introduce is_ptrace_bp() function and move the check inside the
function. It will be utilize more in later set of patches.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Michael Neuling <mikey@neuling.org>
Link: https://lore.kernel.org/r/20200514111741.97993-12-ravi.bangoria@linux.ibm.com
---

diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index 917cca73dbc36..8028a27048741 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -91,6 +91,11 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
 	hw_breakpoint_disable();
 }
 
+static bool is_ptrace_bp(struct perf_event *bp)
+{
+	return bp->overflow_handler == ptrace_triggered;
+}
+
 /*
  * Perform cleanup of arch-specific counters during unregistration
  * of the perf-event
@@ -325,7 +330,7 @@ int hw_breakpoint_handler(struct die_args *args)
 	 * one-shot mode. The ptrace-ed process will receive the SIGTRAP signal
 	 * generated in do_dabr().
 	 */
-	if (bp->overflow_handler == ptrace_triggered) {
+	if (is_ptrace_bp(bp)) {
 		perf_bp_event(bp, regs);
 		rc = NOTIFY_DONE;
 		goto out;