Commit f6dbe294 authored by Jeff Layton's avatar Jeff Layton Committed by Jakub Kicinski
Browse files

ref_tracker: allow pr_ostream() to print directly to a seq_file 



Allow pr_ostream to also output directly to a seq_file without an
intermediate buffer. The first caller of +ref_tracker_dir_seq_print()
will come in a later patch, so mark that __maybe_unused for now. That
designation will be removed once it is used.

Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarJeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20250618-reftrack-dbgfs-v15-5-24fc37ead144@kernel.org


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent aa7d26c3

lib/ref_tracker.c

+26 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
#include <linux/slab.h>

#include <linux/stacktrace.h>

#include <linux/stackdepot.h>

#include <linux/seq_file.h>



#define REF_TRACKER_STACK_ENTRIES 16

#define STACK_BUF_SIZE 1024
@@ -66,6 +67,7 @@ struct ostream { 
	void __ostream_printf (*func)(struct ostream *stream, char *fmt, ...);

	char *prefix;

	char *buf;

	struct seq_file *seq;

	int size, used;

};
@@ -301,6 +303,30 @@ EXPORT_SYMBOL_GPL(ref_tracker_free); 


static struct dentry *ref_tracker_debug_dir = (struct dentry *)-ENOENT;



static void __ostream_printf pr_ostream_seq(struct ostream *stream, char *fmt, ...)

{

	va_list args;



	va_start(args, fmt);

	seq_vprintf(stream->seq, fmt, args);

	va_end(args);

}



static __maybe_unused int

ref_tracker_dir_seq_print(struct ref_tracker_dir *dir, struct seq_file *seq)

{

	struct ostream os = { .func = pr_ostream_seq,

			      .prefix = "",

			      .seq = seq };

	unsigned long flags;



	spin_lock_irqsave(&dir->lock, flags);

	__ref_tracker_dir_pr_ostream(dir, 16, &os);

	spin_unlock_irqrestore(&dir->lock, flags);



	return os.used;

}



static int __init ref_tracker_debugfs_init(void)

{

	ref_tracker_debug_dir = debugfs_create_dir("ref_tracker", NULL);