s390/bpf: Do not write tail call counter into helper and kfunc frames

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Only BPF functions make use of the tail call counter; helpers and
kfuncs ignore and most likely also clobber it. Writing it into these
functions' frames is pointless and misleading, so do not do it.

Fixes: dd691e847d ("s390/bpf: Implement bpf_jit_supports_subprog_tailcalls()")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20250813121016.163375-2-iii@linux.ibm.com

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Ilya Leoshkevich 2025-08-13 14:06:28 +02:00 • committed by Daniel Borkmann

parent 3ec85602f8

commit eada40e057

1 changed files with 12 additions and 4 deletions

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arch/s390/net/bpf_jit_comp.c

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