linux-kernel - [PATCH v4 3/5] stacktrace: add seq_print_stack

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Date:	Mon, 16 Mar 2015 19:06:58 +0300
From:	Stefan Strogin <s.strogin@...tner.samsung.com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:	Stefan Strogin <s.strogin@...tner.samsung.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	aneesh.kumar@...ux.vnet.ibm.com,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Dmitry Safonov <d.safonov@...tner.samsung.com>,
	Pintu Kumar <pintu.k@...sung.com>,
	Weijie Yang <weijie.yang@...sung.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	SeongJae Park <sj38.park@...il.com>,
	Hui Zhu <zhuhui@...omi.com>, Minchan Kim <minchan@...nel.org>,
	Dyasly Sergey <s.dyasly@...sung.com>,
	Vyacheslav Tyrtov <v.tyrtov@...sung.com>,
	Aleksei Mateosian <a.mateosian@...sung.com>,
	gregory.0xf0@...il.com, sasha.levin@...cle.com, gioh.kim@....com,
	pavel@....cz, stefan.strogin@...il.com
Subject: [PATCH v4 3/5] stacktrace: add seq_print_stack_trace()

Add a function seq_print_stack_trace() which prints stacktraces to seq_files.

Signed-off-by: Stefan Strogin <stefan.strogin@...il.com>
Reviewed-by: SeongJae Park <sj38.park@...il.com>
---
 include/linux/stacktrace.h |  4 ++++
 kernel/stacktrace.c        | 17 +++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h
index 0a34489..d80f2e9 100644
--- a/include/linux/stacktrace.h
+++ b/include/linux/stacktrace.h
@@ -2,6 +2,7 @@
 #define __LINUX_STACKTRACE_H
 
 #include <linux/types.h>
+#include <linux/seq_file.h>
 
 struct task_struct;
 struct pt_regs;
@@ -22,6 +23,8 @@ extern void save_stack_trace_tsk(struct task_struct *tsk,
 extern void print_stack_trace(struct stack_trace *trace, int spaces);
 extern int snprint_stack_trace(char *buf, size_t size,
 			struct stack_trace *trace, int spaces);
+extern void seq_print_stack_trace(struct seq_file *m,
+			struct stack_trace *trace, int spaces);
 
 #ifdef CONFIG_USER_STACKTRACE_SUPPORT
 extern void save_stack_trace_user(struct stack_trace *trace);
@@ -35,6 +38,7 @@ extern void save_stack_trace_user(struct stack_trace *trace);
 # define save_stack_trace_user(trace)			do { } while (0)
 # define print_stack_trace(trace, spaces)		do { } while (0)
 # define snprint_stack_trace(buf, size, trace, spaces)	do { } while (0)
+# define seq_print_stack_trace(m, trace, spaces)	do { } while (0)
 #endif
 
 #endif
diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
index b6e4c16..66ef6f4 100644
--- a/kernel/stacktrace.c
+++ b/kernel/stacktrace.c
@@ -57,6 +57,23 @@ int snprint_stack_trace(char *buf, size_t size,
 }
 EXPORT_SYMBOL_GPL(snprint_stack_trace);
 
+void seq_print_stack_trace(struct seq_file *m, struct stack_trace *trace,
+			int spaces)
+{
+	int i;
+
+	if (WARN_ON(!trace->entries))
+		return;
+
+	for (i = 0; i < trace->nr_entries; i++) {
+		unsigned long ip = trace->entries[i];
+
+		seq_printf(m, "%*c[<%p>] %pS\n", 1 + spaces, ' ',
+				(void *) ip, (void *) ip);
+	}
+}
+EXPORT_SYMBOL_GPL(seq_print_stack_trace);
+
 /*
  * Architectures that do not implement save_stack_trace_tsk or
  * save_stack_trace_regs get this weak alias and a once-per-bootup warning
-- 
2.1.0

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