linux-kernel - [PATCH V4 1/7] mm: memcontrol: add helper of memcg_get_e

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210806080302.298297-2-ming.lei@redhat.com>
Date:   Fri,  6 Aug 2021 16:02:56 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Dan Schatzberg <schatzberg.dan@...il.com>,
        Ming Lei <ming.lei@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH V4 1/7] mm: memcontrol: add helper of memcg_get_e_css

And helper of memcg_get_e_css() so that the consumer needn't to
call cgroup_get_e_css(cgroup, &memory_cgrp_subsys) directly, since
&memory_cgrp_subsys has to be used in case that MEMCG is enabled.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
---
 include/linux/memcontrol.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index bfe5c486f4ad..741852addbd7 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1101,6 +1101,11 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
 						gfp_t gfp_mask,
 						unsigned long *total_scanned);
 
+static inline
+struct cgroup_subsys_state *memcg_get_e_css(struct cgroup_subsys_state *css)
+{
+	return cgroup_get_e_css(css->cgroup, &memory_cgrp_subsys);
+}
 #else /* CONFIG_MEMCG */
 
 #define MEM_CGROUP_ID_SHIFT	0
@@ -1456,6 +1461,11 @@ unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
 {
 	return 0;
 }
+static inline
+struct cgroup_subsys_state *memcg_get_e_css(struct cgroup_subsys_state *css)
+{
+	return NULL;
+}
 #endif /* CONFIG_MEMCG */
 
 static inline void __inc_lruvec_kmem_state(void *p, enum node_stat_item idx)
-- 
2.31.1