[PATCH 18/26 v5] seq_buf: Create seq_buf_used() to find out how much was written

From: Steven Rostedt
Date: Sat Nov 15 2014 - 00:10:26 EST


From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>

Add a helper function seq_buf_used() that replaces the SEQ_BUF_USED()
private macro to let callers have a method to know how much of the
seq_buf was written to.

Link: http://lkml.kernel.org/r/20141114011412.170377300@xxxxxxxxxxx
Link: http://lkml.kernel.org/r/20141114011413.321654244@xxxxxxxxxxx

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
include/linux/seq_buf.h | 6 ++++++
kernel/trace/seq_buf.c | 5 +----
2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index 5d91262433e2..93718e570d4c 100644
--- a/include/linux/seq_buf.h
+++ b/include/linux/seq_buf.h
@@ -64,6 +64,12 @@ seq_buf_buffer_left(struct seq_buf *s)
return (s->size - 1) - s->len;
}

+/* How much buffer was written? */
+static inline unsigned int seq_buf_used(struct seq_buf *s)
+{
+ return min(s->len, s->size);
+}
+
extern __printf(2, 3)
int seq_buf_printf(struct seq_buf *s, const char *fmt, ...);
extern __printf(2, 0)
diff --git a/kernel/trace/seq_buf.c b/kernel/trace/seq_buf.c
index 7dac34d1235b..9ec5305d9da7 100644
--- a/kernel/trace/seq_buf.c
+++ b/kernel/trace/seq_buf.c
@@ -16,9 +16,6 @@
#include <linux/seq_file.h>
#include <linux/seq_buf.h>

-/* How much buffer is written? */
-#define SEQ_BUF_USED(s) min((s)->len, (s)->size - 1)
-
/**
* seq_buf_print_seq - move the contents of seq_buf into a seq_file
* @m: the seq_file descriptor that is the destination
@@ -28,7 +25,7 @@
*/
int seq_buf_print_seq(struct seq_file *m, struct seq_buf *s)
{
- unsigned int len = SEQ_BUF_USED(s);
+ unsigned int len = seq_buf_used(s);

return seq_write(m, s->buffer, len);
}
--
2.1.1


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