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Add kernelcompat for list_lru

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Add kernelcompat helpers for initial use of list_lru for shrinking.  The
most complicated part is the walk callback type changing.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2025-10-29 10:12:52 -07:00
parent 206c24c41f
commit 8b6418fb79
3 changed files with 150 additions and 0 deletions
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kmod/src/kernelcompat.h
+47
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@@ -410,4 +410,51 @@ static inline vm_fault_t vmf_error(int err)
}
#endif
#include <linux/list_lru.h>
#ifndef KC_LIST_LRU_SHRINK_COUNT_WALK
/* we don't bother with sc->{nid,memcg} (which doesn't exist in oldest kernels) */
static inline unsigned long list_lru_shrink_count(struct list_lru *lru,
struct shrink_control *sc)
{
return list_lru_count(lru);
}
static inline unsigned long
list_lru_shrink_walk(struct list_lru *lru, struct shrink_control *sc,
list_lru_walk_cb isolate, void *cb_arg)
{
return list_lru_walk(lru, isolate, cb_arg, sc->nr_to_scan);
}
#endif
#ifndef KC_LIST_LRU_ADD_OBJ
#define list_lru_add_obj list_lru_add
#define list_lru_del_obj list_lru_del
#endif
#if defined(KC_LIST_LRU_WALK_CB_LIST_LOCK) || defined(KC_LIST_LRU_WALK_CB_ITEM_LOCK)
struct list_lru_one;
typedef enum lru_status (*kc_list_lru_walk_cb_t)(struct list_head *item, struct list_lru_one *list,
void *cb_arg);
struct kc_isolate_args {
kc_list_lru_walk_cb_t isolate;
void *cb_arg;
};
unsigned long kc_list_lru_walk(struct list_lru *lru, kc_list_lru_walk_cb_t isolate, void *cb_arg,
unsigned long nr_to_walk);
unsigned long kc_list_lru_shrink_walk(struct list_lru *lru, struct shrink_control *sc,
kc_list_lru_walk_cb_t isolate, void *cb_arg);
#else
#define kc_list_lru_shrink_walk list_lru_shrink_walk
#endif
#if defined(KC_LIST_LRU_WALK_CB_ITEM_LOCK)
/* isolate moved by hand, nr_items updated in walk as _REMOVE returned */
static inline void list_lru_isolate_move(struct list_lru_one *list, struct list_head *item,
struct list_head *head)
{
list_move(item, head);
}
#endif
#endif