+ mm-damon-sysfs-schemes-implement-scheme-filters-fix-fix-2.patch added to mm-unstable branch

+ mm-damon-sysfs-schemes-implement-scheme-filters-fix-fix-2.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/sysfs-schemes: return an error for filter memcg path id lookup failure
has been added to the -mm mm-unstable branch.  Its filename is
     mm-damon-sysfs-schemes-implement-scheme-filters-fix-fix-2.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-sysfs-schemes-implement-scheme-filters-fix-fix-2.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/sysfs-schemes: return an error for filter memcg path id lookup failure
Date: Mon, 19 Dec 2022 17:18:07 +0000

Commit f36f860207ef ("mm/damon/sysfs-schemes: implement scheme filters")
on mm-unstable introduced damon_sysfs_memcg_path_to_id(), which returns
non-error even if it didn't find the memcg of the given path.  Caller
could check the failure by seeing if the 'id' has really set or not, but
it's unnecessarily complicated.  Return an error for the case instead.

Link: https://lkml.kernel.org/r/20221219171807.55708-3-sj@kernel.org
Fixes: f36f860207ef ("mm/damon/sysfs-schemes: implement scheme filters") on mm-unstable
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/sysfs-schemes.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/mm/damon/sysfs-schemes.c~mm-damon-sysfs-schemes-implement-scheme-filters-fix-fix-2
+++ a/mm/damon/sysfs-schemes.c
@@ -1418,6 +1418,7 @@ static int damon_sysfs_memcg_path_to_id(
 {
 	struct mem_cgroup *memcg;
 	char *path;
+	bool found = false;
 
 	if (!memcg_path)
 		return -EINVAL;
@@ -1433,12 +1434,13 @@ static int damon_sysfs_memcg_path_to_id(
 			continue;
 		if (damon_sysfs_memcg_path_eq(memcg, path, memcg_path)) {
 			*id = mem_cgroup_id(memcg);
+			found = true;
 			break;
 		}
 	}
 
 	kfree(path);
-	return 0;
+	return found ? 0 : -EINVAL;
 }
 
 static int damon_sysfs_set_scheme_filters(struct damos *scheme,
_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-core-implement-damos-filter.patch
mm-damon-paddr-support-damos-filters.patch
mm-damon-reclaim-add-a-parameter-called-skip_anon-for-avoiding-anonymous-pages-reclamation.patch
docs-admin-guide-damon-reclaim-document-skip_anon-parameter.patch
mm-damon-sysfs-schemes-implement-filters-directory.patch
mm-damon-sysfs-schemes-implement-filter-directory.patch
mm-damon-sysfs-schemes-connect-filter-directory-and-filters-directory.patch
mm-damon-sysfs-schemes-implement-scheme-filters.patch
mm-damon-sysfs-schemes-implement-scheme-filters-fix.patch
mm-damon-sysfs-schemes-implement-scheme-filters-fix-fix-2.patch
selftests-damon-sysfs-test-filters-directory.patch
docs-admin-guide-mm-damon-usage-document-damos-filters-of-sysfs.patch
docs-abi-damon-document-scheme-filters-files.patch