Re: [PATCH bpf-next v3 0/3] Always allow sleepable and fmod_ret programs on syscalls

[Jiri Olsa <olsajiri@gmail.com>]

On Mon, Mar 09, 2026 at 12:23:55PM +0100, Viktor Malik wrote:
> Both sleepable and fmod_ret programs are only allowed on selected
> functions. For convenience, the error injection list was originally
> used.
> 
> When error injection is disabled, that list is empty and sleepable
> tracing programs, as well as fmod_ret programs, are effectively
> unavailable.
> 
> This patch series addresses the issue by at least enabling sleepable and
> fmod_ret programs on syscalls, if error injection is disabled. More
> details on why syscalls are used can be found in [1].
> 
> [1] https://lore.kernel.org/bpf/CAADnVQK6qP8izg+k9yV0vdcT-+=axtFQ2fKw7D-2Ei-V6WS5Dw@mail.gmail.com/
> 
> Changes in v3:
> - Handle LoongArch (Leon)
> - Add Kumar's and Leon's acks

Acked-by: Jiri Olsa <jolsa@kernel.org>

jirka

> 
> Changes in v2:
> - Check "sys_" prefix instead of "sys" for powerpc syscalls (AI review)
> - Add link to the original discussion (Kumar)
> - Add explanation why arch syscall prefixes are hard-coded (Leon)
> 
> Viktor Malik (3):
>   bpf: Always allow sleepable programs on syscalls
>   bpf: Always allow fmod_ret programs on syscalls
>   selftests/bpf: Move sleepable refcounted_kptr tests to syscalls
> 
>  kernel/bpf/verifier.c                         | 85 ++++++++++++++++---
>  .../selftests/bpf/progs/refcounted_kptr.c     |  4 +-
>  .../bpf/progs/refcounted_kptr_fail.c          |  2 +-
>  3 files changed, 74 insertions(+), 17 deletions(-)
> 
> -- 
> 2.53.0
>