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tracing: Create seq_buf layer in trace_seq

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Create a seq_buf layer that trace_seq sits on. The seq_buf will not
be limited to page size. This will allow other usages of seq_buf
instead of a hard set PAGE_SIZE one that trace_seq has.

Link: http://lkml.kernel.org/r/20141104160221.864997179@goodmis.org
Link: http://lkml.kernel.org/r/20141114011412.170377300@goodmis.org

Tested-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-06-25 15:54:42 -04:00 • committed by Steven Rostedt
parent 16a8ef2751
commit 3a161d99c4
8 changed files with 536 additions and 124 deletions
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12
include/linux/trace_seq.h
View file

@ -1,7 +1,7 @@
#ifndef _LINUX_TRACE_SEQ_H
#define _LINUX_TRACE_SEQ_H
#include <linux/fs.h>
#include <linux/seq_buf.h>
#include <asm/page.h>
@ -12,16 +12,14 @@
struct trace_seq {
unsigned char buffer[PAGE_SIZE];
unsigned int len;
unsigned int readpos;
struct seq_buf seq;
int full;
};
static inline void
trace_seq_init(struct trace_seq *s)
{
s->len = 0;
s->readpos = 0;
seq_buf_init(&s->seq, s->buffer, PAGE_SIZE);
s->full = 0;
}
@ -37,7 +35,7 @@ trace_seq_init(struct trace_seq *s)
static inline unsigned char *
trace_seq_buffer_ptr(struct trace_seq *s)
{
return s->buffer + s->len;
return s->buffer + s->seq.len;
}
/**
@ -49,7 +47,7 @@ trace_seq_buffer_ptr(struct trace_seq *s)
*/
static inline bool trace_seq_has_overflowed(struct trace_seq *s)
{
return s->full || s->len > PAGE_SIZE - 1;
return s->full || seq_buf_has_overflowed(&s->seq);
}
/*