x86/bpf: Avoid emitting LOCK prefix for XCHG atomic ops #10454
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The x86 XCHG instruction is implicitly locked when one of the operands is a memory location, making an explicit LOCK prefix unnecessary. Stop emitting the LOCK prefix for BPF_XCHG in the JIT atomic read-modify-write helpers. This avoids redundant instruction prefixes while preserving correct atomic semantics. No functional change for other atomic operations. Signed-off-by: Uros Bizjak <[email protected]> Cc: Alexei Starovoitov <[email protected]> Cc: Daniel Borkmann <[email protected]> Cc: Andrii Nakryiko <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Dave Hansen <[email protected]> Cc: "H. Peter Anvin" <[email protected]>
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Pull request for series with
subject: x86/bpf: Avoid emitting LOCK prefix for XCHG atomic ops
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1031444