From 85192dbf4de08795afe2b88e52a36fc6abfc3dba Mon Sep 17 00:00:00 2001 From: Andrii Nakryiko Date: Sun, 17 Nov 2019 09:28:03 -0800 Subject: bpf: Convert bpf_prog refcnt to atomic64_t Similarly to bpf_map's refcnt/usercnt, convert bpf_prog's refcnt to atomic64 and remove artificial 32k limit. This allows to make bpf_prog's refcounting non-failing, simplifying logic of users of bpf_prog_add/bpf_prog_inc. Validated compilation by running allyesconfig kernel build. Suggested-by: Daniel Borkmann Signed-off-by: Andrii Nakryiko Signed-off-by: Daniel Borkmann Link: https://lore.kernel.org/bpf/20191117172806.2195367-3-andriin@fb.com --- kernel/events/core.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'kernel/events') diff --git a/kernel/events/core.c b/kernel/events/core.c index aec8dba2bea4..73c616876597 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -10477,12 +10477,9 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu, context = parent_event->overflow_handler_context; #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_EVENT_TRACING) if (overflow_handler == bpf_overflow_handler) { - struct bpf_prog *prog = bpf_prog_inc(parent_event->prog); + struct bpf_prog *prog = parent_event->prog; - if (IS_ERR(prog)) { - err = PTR_ERR(prog); - goto err_ns; - } + bpf_prog_inc(prog); event->prog = prog; event->orig_overflow_handler = parent_event->orig_overflow_handler; -- cgit v1.2.3