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-rw-r--r--mm/damon/dbgfs.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index b3f454a5c682..124f0f8c97b7 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -20,6 +20,14 @@ static int dbgfs_nr_ctxs;
static struct dentry **dbgfs_dirs;
static DEFINE_MUTEX(damon_dbgfs_lock);
+static void damon_dbgfs_warn_deprecation(void)
+{
+ pr_warn_once("DAMON debugfs interface is deprecated, "
+ "so users should move to DAMON_SYSFS. If you cannot, "
+ "please report your usecase to damon@lists.linux.dev and "
+ "linux-mm@kvack.org.\n");
+}
+
/*
* Returns non-empty string on success, negative error code otherwise.
*/
@@ -711,6 +719,8 @@ out:
static int damon_dbgfs_open(struct inode *inode, struct file *file)
{
+ damon_dbgfs_warn_deprecation();
+
file->private_data = inode->i_private;
return nonseekable_open(inode, file);
@@ -1039,15 +1049,24 @@ static ssize_t dbgfs_monitor_on_write(struct file *file,
return ret;
}
+static int damon_dbgfs_static_file_open(struct inode *inode, struct file *file)
+{
+ damon_dbgfs_warn_deprecation();
+ return nonseekable_open(inode, file);
+}
+
static const struct file_operations mk_contexts_fops = {
+ .open = damon_dbgfs_static_file_open,
.write = dbgfs_mk_context_write,
};
static const struct file_operations rm_contexts_fops = {
+ .open = damon_dbgfs_static_file_open,
.write = dbgfs_rm_context_write,
};
static const struct file_operations monitor_on_fops = {
+ .open = damon_dbgfs_static_file_open,
.read = dbgfs_monitor_on_read,
.write = dbgfs_monitor_on_write,
};