linux-kernel - [PATCH v7 3/9] hugetlb_cgroup: add cgroup-v2 support

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Message-Id: <20191024202858.95342-3-almasrymina@google.com>
Date:   Thu, 24 Oct 2019 13:28:52 -0700
From:   Mina Almasry <almasrymina@...gle.com>
To:     mike.kravetz@...cle.com
Cc:     shuah@...nel.org, almasrymina@...gle.com, rientjes@...gle.com,
        shakeelb@...gle.com, gthelen@...gle.com, akpm@...ux-foundation.org,
        khalid.aziz@...cle.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        cgroups@...r.kernel.org, aneesh.kumar@...ux.vnet.ibm.com,
        mkoutny@...e.com
Subject: [PATCH v7 3/9] hugetlb_cgroup: add cgroup-v2 support

---
 mm/hugetlb_cgroup.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index 854117513979b..ac1500205faf7 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -503,8 +503,13 @@ static void __init __hugetlb_cgroup_file_init(int idx)
 	cft = &h->cgroup_files[HUGETLB_RES_NULL];
 	memset(cft, 0, sizeof(*cft));

-	WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys,
-					  h->cgroup_files));
+	if (cgroup_subsys_on_dfl(hugetlb_cgrp_subsys)) {
+		WARN_ON(cgroup_add_dfl_cftypes(&hugetlb_cgrp_subsys,
+					       h->cgroup_files));
+	} else {
+		WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys,
+						  h->cgroup_files));
+	}
 }

 void __init hugetlb_cgroup_file_init(void)
@@ -548,8 +553,14 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
 	return;
 }

+static struct cftype hugetlb_files[] = {
+	{} /* terminate */
+};
+
 struct cgroup_subsys hugetlb_cgrp_subsys = {
 	.css_alloc	= hugetlb_cgroup_css_alloc,
 	.css_offline	= hugetlb_cgroup_css_offline,
 	.css_free	= hugetlb_cgroup_css_free,
+	.dfl_cftypes = hugetlb_files,
+	.legacy_cftypes = hugetlb_files,
 };
--
2.24.0.rc0.303.g954a862665-goog