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vmscan: don't bother with debugfs_real_fops()

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... not when it's used only to check which file is used;
debugfs_create_file_aux_num() allows to stash a number into
debugfs entry and debugfs_get_aux_num() extracts it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Braino-spotted-by: Matthew Wilcox <willy@infradead.org>
Link: https://lore.kernel.org/r/20250702211739.GE3406663@ZenIV
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro 2025-07-02 22:17:39 +01:00 committed by Greg Kroah-Hartman
parent 460e36ee6f
commit a7694ff11a
1 changed files with 5 additions and 3 deletions
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8
mm/vmscan.c
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@ -5420,7 +5420,7 @@ static void lru_gen_seq_show_full(struct seq_file *m, struct lruvec *lruvec,
static int lru_gen_seq_show(struct seq_file *m, void *v)
{
unsigned long seq;
bool full = !debugfs_real_fops(m->file)->write;
bool full = debugfs_get_aux_num(m->file);
struct lruvec *lruvec = v;
struct lru_gen_folio *lrugen = &lruvec->lrugen;
int nid = lruvec_pgdat(lruvec)->node_id;
@ -5756,8 +5756,10 @@ static int __init init_lru_gen(void)
if (sysfs_create_group(mm_kobj, &lru_gen_attr_group))
pr_err("lru_gen: failed to create sysfs group\n");
debugfs_create_file("lru_gen", 0644, NULL, NULL, &lru_gen_rw_fops);
debugfs_create_file("lru_gen_full", 0444, NULL, NULL, &lru_gen_ro_fops);
debugfs_create_file_aux_num("lru_gen", 0644, NULL, NULL, 1,
&lru_gen_rw_fops);
debugfs_create_file_aux_num("lru_gen_full", 0444, NULL, NULL, 0,
&lru_gen_ro_fops);
return 0;
};