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mm/damon/dbgfs: print DAMON debugfs interface deprecation message 

DAMON debugfs interface has announced to be deprecated after >v5.15 LTS
kernel is released.  And, v6.1.y has announced to be an LTS[1].

Though the announcement was there for a while, some people might not
noticed that so far.  Also, some users could depend on it and have
problems at  movng to the alternative (DAMON sysfs interface).

For such cases, warn DAMON debugfs interface deprecation with contacts
to ask helps when any DAMON debugfs interface file is opened.

[1] https://git.kernel.org/pub/scm/docs/kernel/website.git/commit/?id=332e9121320bc7461b2d3a79665caf153e51732c

[sj@kernel.org: split DAMON debugfs file open warning message, per Randy]
  Link: https://lkml.kernel.org/r/20230209192009.7885-4-sj@kernel.org
  Link: https://lkml.kernel.org/r/20230210044838.63723-4-sj@kernel.org
Link: https://lkml.kernel.org/r/20230209192009.7885-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2023-02-09 19:20:09 +00:00 committed by Andrew Morton
parent 61e88a2f66
commit 620932cd28
1 changed files with 19 additions and 0 deletions
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19
mm/damon/dbgfs.c
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@ -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,
};