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proc: switch struct proc_dir_entry::count to refcount

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->count is honest reference count unlike ->in_use.

Link: http://lkml.kernel.org/r/20180313174550.GA4332@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan
2018-04-10 16:32:14 -07:00
committed by Linus Torvalds
parent b77d70db65
commit 9cdd83e310
3 changed files with 6 additions and 5 deletions
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4
fs/proc/generic.c
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@@ -402,7 +402,7 @@ static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent,
ent->mode = mode;
ent->nlink = nlink;
ent->subdir = RB_ROOT_CACHED;
atomic_set(&ent->count, 1);
refcount_set(&ent->refcnt, 1);
spin_lock_init(&ent->pde_unload_lock);
INIT_LIST_HEAD(&ent->pde_openers);
proc_set_user(ent, (*parent)->uid, (*parent)->gid);
@@ -553,7 +553,7 @@ EXPORT_SYMBOL(proc_set_user);
void pde_put(struct proc_dir_entry *pde)
{
if (atomic_dec_and_test(&pde->count)) {
if (refcount_dec_and_test(&pde->refcnt)) {
proc_free_inum(pde->low_ino);
pde_free(pde);
}