[PATCH bpf-next 0/9] bpf: Disable preemption in stack map code

[Jiri Olsa <jolsa@kernel.org>]

hi,
we need to disable preemption for get_perf_callchain and keep it disabled
as long as we are accessing its returned trace entries buffer.

This patchset refactors both bpf_get_stack and bpf_get_stackid helpers as
suggested by Andrii [1] before applying the actual preemption fix.

Note the initial fix was sent by Tao Chen [2], but there was no follow up
on this since February, hence this post.

thanks,
jirka


[1] https://lore.kernel.org/bpf/CAEf4BzZwvAUgLwz-M0Y_NJLTmedyY9U6s7LrSmn751hQdTP4Uw@mail.gmail.com/
[2] https://lore.kernel.org/bpf/20260206090653.1336687-1-chen.dylane@linux.dev/
---
Daniel Borkmann (1):
      bpf: Disable preemption in __bpf_get_stack

Jiri Olsa (8):
      bpf: Factor stackid_init function from __bpf_get_stackid
      bpf: Factor stackid_fastpath function from __bpf_get_stackid
      bpf: Factor stackid_new_bucket from __bpf_get_stackid
      bpf: Use stack id functions instead of __bpf_get_stackid
      bpf: Disable preemption in bpf_get_stackid
      bpf: Factor callchain_store function from __bpf_get_stack
      bpf: Factor callchain_finalize function from __bpf_get_stack
      bpf: Remove trace_in argument from __bpf_get_stack

 kernel/bpf/stackmap.c | 292 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------
 1 file changed, 198 insertions(+), 94 deletions(-)