From: Alexei Starovoitov ast@kernel.org
mainline inclusion from mainline-5.15-rc1 commit c1b3fed319d32a721d4b9c17afaeb430444ff773 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I5EUVD CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Move ____bpf_spin_lock/unlock into helpers to make it more clear that quadruple underscore bpf_spin_lock/unlock are irqsave/restore variants.
Signed-off-by: Alexei Starovoitov ast@kernel.org Signed-off-by: Daniel Borkmann daniel@iogearbox.net Acked-by: Martin KaFai Lau kafai@fb.com Acked-by: Andrii Nakryiko andrii@kernel.org Acked-by: Toke Høiland-Jørgensen toke@redhat.com Link: https://lore.kernel.org/bpf/20210715005417.78572-3-alexei.starovoitov@gmail.... (cherry picked from commit c1b3fed319d32a721d4b9c17afaeb430444ff773) Signed-off-by: Wang Yufen wangyufen@huawei.com --- kernel/bpf/helpers.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index e49b4cb5f099..1dbbd10743a6 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -278,13 +278,18 @@ static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
static DEFINE_PER_CPU(unsigned long, irqsave_flags);
-notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock) +static inline void __bpf_spin_lock_irqsave(struct bpf_spin_lock *lock) { unsigned long flags;
local_irq_save(flags); __bpf_spin_lock(lock); __this_cpu_write(irqsave_flags, flags); +} + +notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock) +{ + __bpf_spin_lock_irqsave(lock); return 0; }
@@ -295,13 +300,18 @@ const struct bpf_func_proto bpf_spin_lock_proto = { .arg1_type = ARG_PTR_TO_SPIN_LOCK, };
-notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock) +static inline void __bpf_spin_unlock_irqrestore(struct bpf_spin_lock *lock) { unsigned long flags;
flags = __this_cpu_read(irqsave_flags); __bpf_spin_unlock(lock); local_irq_restore(flags); +} + +notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock) +{ + __bpf_spin_unlock_irqrestore(lock); return 0; }
@@ -322,9 +332,9 @@ void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, else lock = dst + map->spin_lock_off; preempt_disable(); - ____bpf_spin_lock(lock); + __bpf_spin_lock_irqsave(lock); copy_map_value(map, dst, src); - ____bpf_spin_unlock(lock); + __bpf_spin_unlock_irqrestore(lock); preempt_enable(); }