xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

bpf: Convert bpf_prog refcnt to atomic64_t

Browse Source 
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 <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191117172806.2195367-3-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2019-11-17 09:28:03 -08:00
committed by Daniel Borkmann
parent 1e0bd5a091
commit 85192dbf4d
11 changed files with 40 additions and 97 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
kernel/events/core.c
View File

@@ -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;