Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752190AbaKLIZJ (ORCPT ); Wed, 12 Nov 2014 03:25:09 -0500 Received: from LGEMRELSE7Q.lge.com ([156.147.1.151]:49615 "EHLO lgemrelse7q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751585AbaKLIZH (ORCPT ); Wed, 12 Nov 2014 03:25:07 -0500 X-Original-SENDERIP: 10.177.222.213 X-Original-MAILFROM: iamjoonsoo.kim@lge.com From: Joonsoo Kim To: Andrew Morton Cc: Mel Gorman , Johannes Weiner , Minchan Kim , Alexander Nyberg , Dave Hansen , Michal Nazarewicz , Jungsoo Son , Ingo Molnar , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim Subject: [RFC PATCH 4/5] stacktrace: support snprint Date: Wed, 12 Nov 2014 17:27:14 +0900 Message-Id: <1415780835-24642-5-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1415780835-24642-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1415780835-24642-1-git-send-email-iamjoonsoo.kim@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Current stacktrace only have the function for console output. page_owner that will be introduced in following patch needs to print the output of stacktrace into the buffer for our own output format. Also, it needs to print message to debugfs output buffer, so new function, snprint is needed. Signed-off-by: Joonsoo Kim --- include/linux/stacktrace.h | 3 +++ kernel/stacktrace.c | 24 ++++++++++++++++++++++++ 2 files changed, 27 insertions(+) diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h index 115b570..5948c67 100644 --- a/include/linux/stacktrace.h +++ b/include/linux/stacktrace.h @@ -20,6 +20,8 @@ extern void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace); extern void print_stack_trace(struct stack_trace *trace, int spaces); +extern int snprint_stack_trace(char *buf, int buf_len, + struct stack_trace *trace, int spaces); #ifdef CONFIG_USER_STACKTRACE_SUPPORT extern void save_stack_trace_user(struct stack_trace *trace); @@ -32,6 +34,7 @@ extern void save_stack_trace_user(struct stack_trace *trace); # define save_stack_trace_tsk(tsk, trace) do { } while (0) # define save_stack_trace_user(trace) do { } while (0) # define print_stack_trace(trace, spaces) do { } while (0) +# define snprint_stack_trace(buf, len, trace, spaces) do { } while (0) #endif #endif diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c index 00fe55c..61088ff 100644 --- a/kernel/stacktrace.c +++ b/kernel/stacktrace.c @@ -25,6 +25,30 @@ void print_stack_trace(struct stack_trace *trace, int spaces) } EXPORT_SYMBOL_GPL(print_stack_trace); +int snprint_stack_trace(char *buf, int buf_len, struct stack_trace *trace, + int spaces) +{ + int i, printed; + unsigned long ip; + int ret = 0; + + if (WARN_ON(!trace->entries)) + return 0; + + for (i = 0; i < trace->nr_entries && buf_len; i++) { + ip = trace->entries[i]; + printed = snprintf(buf, buf_len, "%*c[<%p>] %pS\n", + 1 + spaces, ' ', (void *) ip, (void *) ip); + + buf_len -= printed; + ret += printed; + buf += printed; + } + + return ret; +} +EXPORT_SYMBOL_GPL(snprint_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 -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/