linux-kernel - [PATCH] tracing: make ftrace_print_array_seq compute buf

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Message-Id: <1430137069-859-1-git-send-email-alex.bennee@linaro.org>
Date:	Mon, 27 Apr 2015 13:17:48 +0100
From:	Alex Bennée <alex.bennee@...aro.org>
To:	rostedt@...dmis.org, mingo@...hat.com
Cc:	linux-kernel@...r.kernel.org,
	Alex Bennée <alex.bennee@...aro.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Dave Martin <Dave.Martin@....com>,
	Petr Mladek <pmladek@...e.cz>
Subject: [PATCH] tracing: make ftrace_print_array_seq compute buf_len

The only caller to this function was getting it wrong. I favoured
pushing the calculation to as close to the need as possible rather than
fixing the one caller.

Signed-off-by: Alex Bennée <alex.bennee@...aro.org>
---
 include/linux/ftrace_event.h | 2 +-
 kernel/trace/trace_output.c  | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
index c674ee8..e6b0262 100644
--- a/include/linux/ftrace_event.h
+++ b/include/linux/ftrace_event.h
@@ -45,7 +45,7 @@ const char *ftrace_print_hex_seq(struct trace_seq *p,
 				 const unsigned char *buf, int len);
 
 const char *ftrace_print_array_seq(struct trace_seq *p,
-				   const void *buf, int buf_len,
+				   const void *buf, int len,
 				   size_t el_size);
 
 struct trace_iterator;
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 692bf71..a42703d 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -178,12 +178,13 @@ ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
 EXPORT_SYMBOL(ftrace_print_hex_seq);
 
 const char *
-ftrace_print_array_seq(struct trace_seq *p, const void *buf, int buf_len,
+ftrace_print_array_seq(struct trace_seq *p, const void *buf, int len,
 		       size_t el_size)
 {
 	const char *ret = trace_seq_buffer_ptr(p);
 	const char *prefix = "";
 	void *ptr = (void *)buf;
+	size_t buf_len = len * el_size;
 
 	trace_seq_putc(p, '{');
 
-- 
2.3.5

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