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bpf: export bpf_link_inc_not_zero.

Browse Source 
bpf_link_inc_not_zero() will be used by kernel modules.  We will use it in
bpf_testmod.c later.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
Link: https://lore.kernel.org/r/20240530065946.979330-5-thinker.li@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Kui-Feng Lee 2024-05-29 23:59:42 -07:00 committed by Martin KaFai Lau
parent 1adddc97aa
commit 67c3e8353f
2 changed files with 8 additions and 1 deletions
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6
include/linux/bpf.h
View File

@ -2334,6 +2334,7 @@ int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
int bpf_link_settle(struct bpf_link_primer *primer);
void bpf_link_cleanup(struct bpf_link_primer *primer);
void bpf_link_inc(struct bpf_link *link);
struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link);
void bpf_link_put(struct bpf_link *link);
int bpf_link_new_fd(struct bpf_link *link);
struct bpf_link *bpf_link_get_from_fd(u32 ufd);
@ -2705,6 +2706,11 @@ static inline void bpf_link_inc(struct bpf_link *link)
{
}
static inline struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
{
return NULL;
}
static inline void bpf_link_put(struct bpf_link *link)
{
}

3
kernel/bpf/syscall.c
View File

@ -5437,10 +5437,11 @@ static int link_detach(union bpf_attr *attr)
return ret;
}
static struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
{
return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? link : ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(bpf_link_inc_not_zero);
struct bpf_link *bpf_link_by_id(u32 id)
{