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Date:   Wed, 13 Jan 2021 10:16:56 +0100
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Subject: [PATCH 3/4] kfence: use error_report_start and error_report_end tracepoints
From:   Alexander Potapenko <glider@google.com>
To:     akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Cc:     Alexander Potapenko <glider@google.com>,
        Marco Elver <elver@google.com>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Ingo Molnar <mingo@redhat.com>, Petr Mladek <pmladek@suse.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        linux-mm@kvack.org
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Precedence: bulk

Make it possible to trace KFENCE error reporting (in particular, for
compatibility with CONFIG_ERROR_REPORT_NOTIFY).

Suggested-by: Marco Elver <elver@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Marco Elver <elver@google.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: linux-mm@kvack.org
Signed-off-by: Alexander Potapenko <glider@google.com>
---
 mm/kfence/report.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/kfence/report.c b/mm/kfence/report.c
index 4dedc2ff8f28..5c063b5b2227 100644
--- a/mm/kfence/report.c
+++ b/mm/kfence/report.c
@@ -9,6 +9,7 @@
 #include <linux/seq_file.h>
 #include <linux/stacktrace.h>
 #include <linux/string.h>
+#include <trace/events/error_report.h>
 
 #include <asm/kfence.h>
 
@@ -184,6 +185,7 @@ void kfence_report_error(unsigned long address, struct pt_regs *regs,
 	lockdep_off();
 
 	pr_err("==================================================================\n");
+	trace_error_report_start("kfence", address);
 	/* Print report header. */
 	switch (type) {
 	case KFENCE_ERROR_OOB: {
@@ -232,6 +234,7 @@ void kfence_report_error(unsigned long address, struct pt_regs *regs,
 		show_regs(regs);
 	else
 		dump_stack_print_info(KERN_ERR);
+	trace_error_report_end("kfence", address);
 	pr_err("==================================================================\n");
 
 	lockdep_on();
-- 
2.30.0.284.gd98b1dd5eaa7-goog