diff options
| author | Dave Airlie <airlied@redhat.com> | 2015-12-08 11:04:26 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2015-12-08 11:04:26 +1000 |
| commit | e876b41ab074561d65f213bf5e0fc68cf5bc7380 (patch) | |
| tree | 5bcbd7e4f7b6ac2a34e61011f8eb2cde90bf8603 /kernel/bpf/syscall.c | |
| parent | 47c0fd72822159eb501411f975f5672a0bf7a7fb (diff) | |
| parent | 527e9316f8ec44bd53d90fb9f611fa7ffff52bb9 (diff) | |
Back merge tag 'v4.4-rc4' into drm-next
We've picked up a few conflicts and it would be nice
to resolve them before we move onwards.
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 40 |
1 files changed, 27 insertions, 13 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 0d3313d02a7e..3b39550d8485 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -82,6 +82,14 @@ static void bpf_map_free_deferred(struct work_struct *work) map->ops->map_free(map); } +static void bpf_map_put_uref(struct bpf_map *map) +{ + if (atomic_dec_and_test(&map->usercnt)) { + if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) + bpf_fd_array_map_clear(map); + } +} + /* decrement map refcnt and schedule it for freeing via workqueue * (unrelying map implementation ops->map_free() might sleep) */ @@ -93,17 +101,15 @@ void bpf_map_put(struct bpf_map *map) } } -static int bpf_map_release(struct inode *inode, struct file *filp) +void bpf_map_put_with_uref(struct bpf_map *map) { - struct bpf_map *map = filp->private_data; - - if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) - /* prog_array stores refcnt-ed bpf_prog pointers - * release them all when user space closes prog_array_fd - */ - bpf_fd_array_map_clear(map); - + bpf_map_put_uref(map); bpf_map_put(map); +} + +static int bpf_map_release(struct inode *inode, struct file *filp) +{ + bpf_map_put_with_uref(filp->private_data); return 0; } @@ -142,6 +148,7 @@ static int map_create(union bpf_attr *attr) return PTR_ERR(map); atomic_set(&map->refcnt, 1); + atomic_set(&map->usercnt, 1); err = bpf_map_charge_memlock(map); if (err) @@ -174,7 +181,14 @@ struct bpf_map *__bpf_map_get(struct fd f) return f.file->private_data; } -struct bpf_map *bpf_map_get(u32 ufd) +void bpf_map_inc(struct bpf_map *map, bool uref) +{ + atomic_inc(&map->refcnt); + if (uref) + atomic_inc(&map->usercnt); +} + +struct bpf_map *bpf_map_get_with_uref(u32 ufd) { struct fd f = fdget(ufd); struct bpf_map *map; @@ -183,7 +197,7 @@ struct bpf_map *bpf_map_get(u32 ufd) if (IS_ERR(map)) return map; - atomic_inc(&map->refcnt); + bpf_map_inc(map, true); fdput(f); return map; @@ -226,7 +240,7 @@ static int map_lookup_elem(union bpf_attr *attr) goto free_key; err = -ENOMEM; - value = kmalloc(map->value_size, GFP_USER); + value = kmalloc(map->value_size, GFP_USER | __GFP_NOWARN); if (!value) goto free_key; @@ -285,7 +299,7 @@ static int map_update_elem(union bpf_attr *attr) goto free_key; err = -ENOMEM; - value = kmalloc(map->value_size, GFP_USER); + value = kmalloc(map->value_size, GFP_USER | __GFP_NOWARN); if (!value) goto free_key; |