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Subject[PATCH 1/3] stacktrace: add seq_print_stack_trace()
Date
Add a function seq_print_stack_trace() which prints stacktraces to seq_files.

Signed-off-by: Stefan I. Strogin <s.strogin@partner.samsung.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 669045a..6d62484 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;
@@ -24,6 +25,8 @@ 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);
@@ -37,6 +40,7 @@ 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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