[PATCH bpf-next 0/3] follow up for __jited test tag

[Eduard Zingerman <eddyz87@gmail.com>]

This patch-set is a collection of follow-ups for
"__jited test tag to check disassembly after jit" series (see [1]).

First patch is most important:
as it turns out, I broke all test_loader based tests for s390 CI.
E.g. see log [2] for s390 execution of test_progs,
note all 'verivier_*' tests being skipped.
This happens because of incorrect handling of corner case when
get_current_arch() does not know which architecture to return.

Second patch makes matching of function return sequence in
verifier_tailcall_jit more flexible:

    -__jited("	retq")
    +__jited("	{{(retq|jmp	0x)}}")

The difference could be seen with and w/o mitigations=off boot
parameter for test VM (CI runs with mitigations=off, hence it
generates retq).

Third patch addresses Alexei's request to add #define and a comment in
jit_disasm_helpers.c.

[1] https://lore.kernel.org/bpf/20240820102357.3372779-1-eddyz87@gmail.com/
[2] https://github.com/kernel-patches/bpf/actions/runs/10518445973/job/29144511595

Eduard Zingerman (3):
  selftests/bpf: test_loader.c:get_current_arch() should not return 0
  selftests/bpf: match both retq/rethunk in verifier_tailcall_jit
  selftests/bpf: #define LOCAL_LABEL_LEN for jit_disasm_helpers.c

 .../testing/selftests/bpf/jit_disasm_helpers.c  | 17 ++++++++++++++---
 .../selftests/bpf/progs/verifier_tailcall_jit.c |  4 ++--
 tools/testing/selftests/bpf/test_loader.c       |  9 +++++----
 3 files changed, 21 insertions(+), 9 deletions(-)

-- 
2.46.0