[PATCH v4 42/48] mm: shrinker: remove old APIs

Qi Zheng
2023-08-07T11:23:56Z

Now no users are using the old APIs, just remove them.

Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
---
include/linux/shrinker.h | 7 --
mm/shrinker.c | 143 ---------------------------------------
2 files changed, 150 deletions(-)

diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
index cc23ff0aee20..c55c07c3f0cb 100644
--- a/include/linux/shrinker.h
+++ b/include/linux/shrinker.h
@@ -103,13 +103,6 @@ struct shrinker *shrinker_alloc(unsigned int flags, const char *fmt, ...);
void shrinker_register(struct shrinker *shrinker);
void shrinker_free(struct shrinker *shrinker);

-extern int __printf(2, 3) prealloc_shrinker(struct shrinker *shrinker,
- const char *fmt, ...);
-extern void register_shrinker_prepared(struct shrinker *shrinker);
-extern int __printf(2, 3) register_shrinker(struct shrinker *shrinker,
- const char *fmt, ...);
-extern void unregister_shrinker(struct shrinker *shrinker);
-extern void free_prealloced_shrinker(struct shrinker *shrinker);
extern void synchronize_shrinkers(void);

#ifdef CONFIG_SHRINKER_DEBUG
diff --git a/mm/shrinker.c b/mm/shrinker.c
index 43a375f954f3..3ab301ff122d 100644
--- a/mm/shrinker.c
+++ b/mm/shrinker.c
@@ -651,149 +651,6 @@ void shrinker_free(struct shrinker *shrinker)
}
EXPORT_SYMBOL_GPL(shrinker_free);

-/*
- * Add a shrinker callback to be called from the vm.
- */
-static int __prealloc_shrinker(struct shrinker *shrinker)
-{
- unsigned int size;
- int err;
-
- if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
- err = prealloc_memcg_shrinker(shrinker);
- if (err != -ENOSYS)
- return err;
-
- shrinker->flags &= ~SHRINKER_MEMCG_AWARE;
- }
-
- size = sizeof(*shrinker->nr_deferred);
- if (shrinker->flags & SHRINKER_NUMA_AWARE)
- size *= nr_node_ids;
-
- shrinker->nr_deferred = kzalloc(size, GFP_KERNEL);
- if (!shrinker->nr_deferred)
- return -ENOMEM;
-
- return 0;
-}
-
-#ifdef CONFIG_SHRINKER_DEBUG
-int prealloc_shrinker(struct shrinker *shrinker, const char *fmt, ...)
-{
- va_list ap;
- int err;
-
- va_start(ap, fmt);
- shrinker->name = kvasprintf_const(GFP_KERNEL, fmt, ap);
- va_end(ap);
- if (!shrinker->name)
- return -ENOMEM;
-
- err = __prealloc_shrinker(shrinker);
- if (err) {
- kfree_const(shrinker->name);
- shrinker->name = NULL;
- }
-
- return err;
-}
-#else
-int prealloc_shrinker(struct shrinker *shrinker, const char *fmt, ...)
-{
- return __prealloc_shrinker(shrinker);
-}
-#endif
-
-void free_prealloced_shrinker(struct shrinker *shrinker)
-{
-#ifdef CONFIG_SHRINKER_DEBUG
- kfree_const(shrinker->name);
- shrinker->name = NULL;
-#endif
- if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
- down_write(&shrinker_rwsem);
- unregister_memcg_shrinker(shrinker);
- up_write(&shrinker_rwsem);
- return;
- }
-
- kfree(shrinker->nr_deferred);
- shrinker->nr_deferred = NULL;
-}
-
-void register_shrinker_prepared(struct shrinker *shrinker)
-{
- down_write(&shrinker_rwsem);
- list_add_tail(&shrinker->list, &shrinker_list);
- shrinker->flags |= SHRINKER_REGISTERED;
- shrinker_debugfs_add(shrinker);
- up_write(&shrinker_rwsem);
-}
-
-static int __register_shrinker(struct shrinker *shrinker)
-{
- int err = __prealloc_shrinker(shrinker);
-
- if (err)
- return err;
- register_shrinker_prepared(shrinker);
- return 0;
-}
-
-#ifdef CONFIG_SHRINKER_DEBUG
-int register_shrinker(struct shrinker *shrinker, const char *fmt, ...)
-{
- va_list ap;
- int err;
-
- va_start(ap, fmt);
- shrinker->name = kvasprintf_const(GFP_KERNEL, fmt, ap);
- va_end(ap);
- if (!shrinker->name)
- return -ENOMEM;
-
- err = __register_shrinker(shrinker);
- if (err) {
- kfree_const(shrinker->name);
- shrinker->name = NULL;
- }
- return err;
-}
-#else
-int register_shrinker(struct shrinker *shrinker, const char *fmt, ...)
-{
- return __register_shrinker(shrinker);
-}
-#endif
-EXPORT_SYMBOL(register_shrinker);
-
-/*
- * Remove one
- */
-void unregister_shrinker(struct shrinker *shrinker)
-{
- struct dentry *debugfs_entry;
- int debugfs_id;
-
- if (!(shrinker->flags & SHRINKER_REGISTERED))
- return;
-
- down_write(&shrinker_rwsem);
- list_del(&shrinker->list);
- shrinker->flags &= ~SHRINKER_REGISTERED;
- if (shrinker->flags & SHRINKER_MEMCG_AWARE)
- unregister_memcg_shrinker(shrinker);
- debugfs_entry = shrinker_debugfs_detach(shrinker, &debugfs_id);
- up_write(&shrinker_rwsem);
-
- shrinker_debugfs_remove(debugfs_entry, debugfs_id);
-
- kfree(shrinker->nr_deferred);
- shrinker->nr_deferred = NULL;
-}
-EXPORT_SYMBOL(unregister_shrinker);
-
/**
* synchronize_shrinkers - Wait for all running shrinkers to complete.
*
--
2.30.2