Lack of a standardized userspace API to detect active ARMv8.2‑A LSE atomic instruction usage
Developers need a reliable way to determine at runtime whether their atomic operations are executed using the ARMv8.2‑A Large System Extensions (LSE) instructions or have fallen back to the legacy LDREX/STREX loop, especially on systems that mix CPUs with and without LSE support. While the Linux kernel can optionally disable LSE via a boot parameter or sysct
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