On Thu, Nov 18, 2021 at 3:25 AM Jiri Olsa [off-list ref] wrote:

Keeping active attached trampoline in bpf_prog so it can be used
in following changes to account for multiple functions attachments
in program.

As EXT programs are not going to be supported in multiple functions
attachment for now, I'm keeping them stored in link.

can the same EXT program be attached twice? If not, why can't you just
use the same prog->aux->trampoline instead of the if/else everywhere?

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 include/linux/bpf.h  |  1 +
 kernel/bpf/syscall.c | 34 +++++++++++++++++++++++++++++-----
 2 files changed, 30 insertions(+), 5 deletions(-)