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seq_buf: Create seq_buf_used() to find out how much was written 

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@goodmis.org
Link: http://lkml.kernel.org/r/20141114011413.321654244@goodmis.org

Reviewed-by: Petr Mladek <pmladek@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-11-06 16:38:28 -05:00 committed by Steven Rostedt
parent 0736c033a8
commit eeab98154d
2 changed files with 7 additions and 4 deletions
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6
include/linux/seq_buf.h
View File

@ -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)

5
kernel/trace/seq_buf.c
View File

@ -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);
}