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bpf: use rcu_read_lock_dont_migrate() for bpf_inode_storage_free()

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Use rcu_read_lock_dont_migrate() and rcu_read_unlock_migrate() in
bpf_inode_storage_free to obtain better performance when PREEMPT_RCU is
not enabled.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Link: https://lore.kernel.org/r/20250821090609.42508-4-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Menglong Dong 2025-08-21 17:06:05 +08:00 committed by Alexei Starovoitov
parent 8c0afc7c9c
commit f2fa9b9069
1 changed files with 2 additions and 4 deletions
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6
kernel/bpf/bpf_inode_storage.c
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@ -62,8 +62,7 @@ void bpf_inode_storage_free(struct inode *inode)
if (!bsb)
return;
migrate_disable();
rcu_read_lock();
rcu_read_lock_dont_migrate();
local_storage = rcu_dereference(bsb->storage);
if (!local_storage)
@ -71,8 +70,7 @@ void bpf_inode_storage_free(struct inode *inode)
bpf_local_storage_destroy(local_storage);
out:
rcu_read_unlock();
migrate_enable();
rcu_read_unlock_migrate();
}
static void *bpf_fd_inode_storage_lookup_elem(struct bpf_map *map, void *key)