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authorDaniel Borkmann <daniel@iogearbox.net>2016-06-28 13:18:23 +0300
committerDavid S. Miller <davem@davemloft.net>2016-06-30 12:54:40 +0300
commit1ca1cc98bf7418c680415bfce05699f67510a7fd (patch)
treec7f9924f35a3645b99208534b887c84077cfb975 /kernel/bpf
parentee58b57100ca953da7320c285315a95db2f7053d (diff)
downloadlinux-1ca1cc98bf7418c680415bfce05699f67510a7fd.tar.xz
bpf: minor cleanups on fd maps and helpers
Some minor cleanups: i) Remove the unlikely() from fd array map lookups and let the CPU branch predictor do its job, scenarios where there is not always a map entry are very well valid. ii) Move the attribute type check in the bpf_perf_event_read() helper a bit earlier so it's consistent wrt checks with bpf_perf_event_output() helper as well. iii) remove some comments that are self-documenting in kprobe_prog_is_valid_access() and therefore make it consistent to tp_prog_is_valid_access() as well. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf')
-rw-r--r--kernel/bpf/core.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index b94a36550591..d638062f66d6 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -719,14 +719,13 @@ select_insn:
if (unlikely(index >= array->map.max_entries))
goto out;
-
if (unlikely(tail_call_cnt > MAX_TAIL_CALL_CNT))
goto out;
tail_call_cnt++;
prog = READ_ONCE(array->ptrs[index]);
- if (unlikely(!prog))
+ if (!prog)
goto out;
/* ARG1 at this point is guaranteed to point to CTX from