bpf: Add spis_*() helpers for 4-byte stack slot bitmasks

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Add helper functions for manipulating u64[2] bitmasks that represent
4-byte stack slot liveness. The 512-byte BPF stack is divided into
128 4-byte slots, requiring 128 bits (two u64s) to track.

These will be used by the static stack liveness analysis in the
next commit.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260410-patch-set-v4-3-5d4eecb343db@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Alexei Starovoitov 2026-04-10 13:55:54 -07:00

parent cf3ee1ecf3

commit 2ad45b414b

1 changed files with 67 additions and 0 deletions

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include/linux/bpf_verifier.h

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