linux-kernel - Re: [PATCH 1/3] stacktrace: add seq_print_stack

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Date:	Sat, 27 Dec 2014 16:04:04 +0900 (KST)
From:	SeongJae Park <sj38.park@...il.com>
To:	"Stefan I. Strogin" <s.strogin@...tner.samsung.com>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	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>
Subject: Re: [PATCH 1/3] stacktrace: add seq_print_stack_trace()



On Fri, 26 Dec 2014, Stefan I. Strogin wrote:

> Add a function seq_print_stack_trace() which prints stacktraces to seq_files.
>
> Signed-off-by: Stefan I. Strogin <s.strogin@...tner.samsung.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 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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