linux-kernel - [PATCH v2] tracing: make ftrace_print_array_seq compute buf

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Date:	Wed, 29 Apr 2015 16:18:46 +0100
From:	Alex Bennée <alex.bennee@...aro.org>
To:	rostedt@...dmis.org, mingo@...hat.com, Dave.Martin@....com
Cc:	linux-kernel@...r.kernel.org,
	Alex Bennée <alex.bennee@...aro.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Javi Merino <javi.merino@....com>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: [PATCH v2] tracing: make ftrace_print_array_seq compute buf_len

The only caller to this function (__print_array) was getting it wrong by
passing the array length instead of buffer length. As the element size
was already being passed for other reasons it seems reasonable to push
the calculation of buffer length into the function.

Signed-off-by: Alex Bennée <alex.bennee@...aro.org>

---
v2:
  - more explicit commit message
  - rename len -> count to reduce ambiguity
---
 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..33a66e6 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 count,
 				   size_t el_size);
 
 struct trace_iterator;
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 692bf71..25a086b 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 count,
 		       size_t el_size)
 {
 	const char *ret = trace_seq_buffer_ptr(p);
 	const char *prefix = "";
 	void *ptr = (void *)buf;
+	size_t buf_len = count * el_size;
 
 	trace_seq_putc(p, '{');
 
-- 
2.3.5

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