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mm/hugetlb_cgroup: identify the legacy using cgroup_subsys_on_dfl()

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Patch series "mm/hugetlb_cgroup: rework on cftypes", v3.

This patchset provides an intuitive view of the control files through
static templates of cftypes.  This improves the readability of the code.  


This patch (of 3):

Currently the numa_stat file encodes 1 into .private using the micro
MEMFILE_PRIVATE() to identify the legacy.  Actually, we can use
cgroup_subsys_on_dfl() instead.  This is helpful to handle .private in the
static templates in the next patch.

Link: https://lkml.kernel.org/r/20240612092409.2027592-1-xiujianfeng@huawei.com
Link: https://lkml.kernel.org/r/20240612092409.2027592-2-xiujianfeng@huawei.com
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Xiu Jianfeng 2024-06-12 09:24:07 +00:00 committed by Andrew Morton
parent 46f8ff3c39
commit f79e808ee8
1 changed files with 2 additions and 2 deletions
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4
mm/hugetlb_cgroup.c
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@ -460,7 +460,7 @@ static int hugetlb_cgroup_read_numa_stat(struct seq_file *seq, void *dummy)
int nid;
struct cftype *cft = seq_cft(seq);
int idx = MEMFILE_IDX(cft->private);
bool legacy = MEMFILE_ATTR(cft->private);
bool legacy = !cgroup_subsys_on_dfl(hugetlb_cgrp_subsys);
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq));
struct cgroup_subsys_state *css;
unsigned long usage;
@ -839,7 +839,7 @@ static void __init __hugetlb_cgroup_file_legacy_init(int idx)
/* Add the numa stat file */
cft = &h->cgroup_files_legacy[8];
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.numa_stat", buf);
cft->private = MEMFILE_PRIVATE(idx, 1);
cft->private = MEMFILE_PRIVATE(idx, 0);
cft->seq_show = hugetlb_cgroup_read_numa_stat;
/* NULL terminate the last cft */