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bpf: Drop always true do_idr_lock parameter to bpf_map_free_id 

The do_idr_lock parameter to bpf_map_free_id was introduced by commit
bd5f5f4ecb ("bpf: Add BPF_MAP_GET_FD_BY_ID"). However, all callers set
do_idr_lock = true since commit 1e0bd5a091 ("bpf: Switch bpf_map ref
counter to atomic64_t so bpf_map_inc() never fails").

While at it also inline __bpf_map_put into its only caller bpf_map_put
now that do_idr_lock can be dropped from its signature.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Link: https://lore.kernel.org/r/20230202141921.4424-1-tklauser@distanz.ch
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Tobias Klauser 2023-02-02 15:19:21 +01:00 committed by Alexei Starovoitov
parent d9e44c324c
commit 158e5e9eea
3 changed files with 8 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/bpf.h
View File

@ -1846,7 +1846,7 @@ struct bpf_prog * __must_check bpf_prog_inc_not_zero(struct bpf_prog *prog);
void bpf_prog_put(struct bpf_prog *prog);
void bpf_prog_free_id(struct bpf_prog *prog);
void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
void bpf_map_free_id(struct bpf_map *map);
struct btf_field *btf_record_find(const struct btf_record *rec,
u32 offset, enum btf_field_type type);

2
kernel/bpf/offload.c
View File

@ -136,7 +136,7 @@ static void __bpf_map_offload_destroy(struct bpf_offloaded_map *offmap)
{
WARN_ON(bpf_map_offload_ndo(offmap, BPF_OFFLOAD_MAP_FREE));
/* Make sure BPF_MAP_GET_NEXT_ID can't find this dead map */
bpf_map_free_id(&offmap->map, true);
bpf_map_free_id(&offmap->map);
list_del_init(&offmap->offloads);
offmap->netdev = NULL;
}

23
kernel/bpf/syscall.c
View File

@ -390,7 +390,7 @@ static int bpf_map_alloc_id(struct bpf_map *map)
return id > 0 ? 0 : id;
}
void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
void bpf_map_free_id(struct bpf_map *map)
{
unsigned long flags;
@ -402,18 +402,12 @@ void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock)
if (!map->id)
return;
if (do_idr_lock)
spin_lock_irqsave(&map_idr_lock, flags);
else
__acquire(&map_idr_lock);
spin_lock_irqsave(&map_idr_lock, flags);
idr_remove(&map_idr, map->id);
map->id = 0;
if (do_idr_lock)
spin_unlock_irqrestore(&map_idr_lock, flags);
else
__release(&map_idr_lock);
spin_unlock_irqrestore(&map_idr_lock, flags);
}
#ifdef CONFIG_MEMCG_KMEM
@ -706,13 +700,13 @@ static void bpf_map_put_uref(struct bpf_map *map)
}
/* decrement map refcnt and schedule it for freeing via workqueue
* (unrelying map implementation ops->map_free() might sleep)
* (underlying map implementation ops->map_free() might sleep)
*/
static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
void bpf_map_put(struct bpf_map *map)
{
if (atomic64_dec_and_test(&map->refcnt)) {
/* bpf_map_free_id() must be called first */
bpf_map_free_id(map, do_idr_lock);
bpf_map_free_id(map);
btf_put(map->btf);
INIT_WORK(&map->work, bpf_map_free_deferred);
/* Avoid spawning kworkers, since they all might contend
@ -721,11 +715,6 @@ static void __bpf_map_put(struct bpf_map *map, bool do_idr_lock)
queue_work(system_unbound_wq, &map->work);
}
}
void bpf_map_put(struct bpf_map *map)
{
__bpf_map_put(map, true);
}
EXPORT_SYMBOL_GPL(bpf_map_put);
void bpf_map_put_with_uref(struct bpf_map *map)