[0/3] bpf: optimize the bpf_kprobe_multi_link_attach function

Message

Jiabing Wan May 12, 2022, 2:17 p.m. UTC

This patch series tries to optimize the bpf_kporbe_multi_link_attach
in bpf_trace.c

Firstly, there is only one 'error' tag to handle error code. But in one
'error' tag, there are three 'free' functions which is not efficient. So
I split this one tag to three tags to make it clear.

Secondly, I simplify double 'if' statements to one statement.

Finally, coccicheck reports an opportunity for vmemdup_user. So I use
vmemdup_user to make code cleaner.

Wan Jiabing (3):
  bpf: use 'error_xxx' tags in bpf_kprobe_multi_link_attach
  bpf: simplify if-if to if in bpf_kprobe_multi_link_attach
  bpf: use vmemdup_user instead of kvmalloc and copy_from_user

 kernel/trace/bpf_trace.c | 34 +++++++++++++++-------------------
 1 file changed, 15 insertions(+), 19 deletions(-)