On Mon, Mar 16 2015, Stefan Strogin wrote:
> Add a function seq_print_stack_trace() which prints stacktraces to seq_files.
>
> Signed-off-by: Stefan Strogin <stefan.strogin@xxxxxxxxx>
> Reviewed-by: SeongJae Park <sj38.park@xxxxxxxxx>
Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
> ---
> 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
>
--
Best regards, _ _
.o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
..o | Computer Science, Michał “mina86” Nazarewicz (o o)
ooo +--<mpn@xxxxxxxxxx>--<xmpp:mina86@xxxxxxxxxx>--ooO--(_)--Ooo--
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