bpf: Don't run arg-tracking analysis twice on main subprog

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Because subprog 0, the main subprog, is considered a global function,
we end up running the arg-tracking dataflow analysis twice on it. That
results in slightly longer verification but mostly in more verbose
verifier logs. This patch fixes it by keeping only the iteration over
global subprogs.

When running over all of Cilium's programs with BPF_LOG_LEVEL2, this
reduces verbosity by ~20% on average.

Fixes: bf0c571f7f ("bpf: introduce forward arg-tracking dataflow analysis")
Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/e4d7b53d4963ef520541a782f5fc8108a168877c.1778176504.git.paul.chaignon@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Paul Chaignon 2026-05-07 20:22:06 +02:00 • committed by Alexei Starovoitov

parent 18fc650ccd

commit 512809bb8a

1 changed files with 7 additions and 18 deletions

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kernel/bpf/liveness.c

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