linux-kernel - [PATCH v2 11/16] powerpc/watchpoint: Introduce is_ptrace

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Date:   Wed,  1 Apr 2020 11:43:04 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     mpe@...erman.id.au, mikey@...ling.org
Cc:     apopple@...ux.ibm.com, paulus@...ba.org, npiggin@...il.com,
        christophe.leroy@....fr, naveen.n.rao@...ux.vnet.ibm.com,
        peterz@...radead.org, jolsa@...nel.org, oleg@...hat.com,
        fweisbec@...il.com, mingo@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        ravi.bangoria@...ux.ibm.com
Subject: [PATCH v2 11/16] powerpc/watchpoint: Introduce is_ptrace_bp() function

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

Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
---
 arch/powerpc/kernel/hw_breakpoint.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index 6daa95b8bb88..8d3f7d87d790 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c
@@ -90,6 +90,11 @@ 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
@@ -324,7 +329,7 @@ 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;
-- 
2.21.1