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mm, memcg: mark cgroup_memory_nosocket, nokmem and noswap as __ro_after_init

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cgroup_memory_nosocket, cgroup_memory_nokmem and cgroup_memory_noswap
are initialized during the kernel initialization and never change
their value afterwards.

cgroup_memory_nosocket, cgroup_memory_nokmem are written only from
cgroup_memory(), which is marked as __init.

cgroup_memory_noswap is written from setup_swap_account() and
mem_cgroup_swap_init(), both are marked as __init.

Mark all three variables as __ro_after_init.

Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
This commit is contained in:
Roman Gushchin 2021-06-02 18:09:29 -07:00 committed by Dennis Zhou
parent 8d55ba5df3
commit 0f0cace35f
1 changed files with 3 additions and 3 deletions
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6
mm/memcontrol.c
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@ -80,14 +80,14 @@ struct mem_cgroup *root_mem_cgroup __read_mostly;
DEFINE_PER_CPU(struct mem_cgroup *, int_active_memcg);
/* Socket memory accounting disabled? */
static bool cgroup_memory_nosocket;
static bool cgroup_memory_nosocket __ro_after_init;
/* Kernel memory accounting disabled? */
static bool cgroup_memory_nokmem;
static bool cgroup_memory_nokmem __ro_after_init;
/* Whether the swap controller is active */
#ifdef CONFIG_MEMCG_SWAP
bool cgroup_memory_noswap __read_mostly;
bool cgroup_memory_noswap __ro_after_init;
#else
#define cgroup_memory_noswap 1
#endif