[BPF] Fix dst/val mismatch in class ATOMIC_NOFETCH #107288
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eddyz87
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Sep 4, 2024
All ATOMIC_NOFETCH insns have "$dst = $val" constraints. So let us enforce "$dst = $val" having the same register type in ATOMIC_NOFETCH as well. Currently, things work since ATOMIC_NOFETCH does not have source code pattern matching. I am experimenting to introduce memory ordering to BPFInstrInfo.td file and pattern matching will be needed. Eventually, for atomic_fetch_*() insns locked insns could be generated if memory ordering is memory_order_relaxed. [1] https://lore.kernel.org/bpf/[email protected]/
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eddyz87
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All ATOMIC_NOFETCH insns have "$dst = $val" constraints. So let us enforce "$dst = $val" having the same register type in ATOMIC_NOFETCH as well.
Currently, things work since ATOMIC_NOFETCH does not have source code pattern matching. I am experimenting to introduce memory ordering to BPFInstrInfo.td file and pattern matching will be needed. Eventually, for atomic_fetch_*() insns locked insns could be generated if memory ordering is memory_order_relaxed.
[1] https://lore.kernel.org/bpf/[email protected]/