a83c682b36
Once all CPUs are online, determine if they all support LSE atomics and set lse_supported to indicate this. For now the atomic(9) implementations are still always inlined, though it would be preferable to create out-of-line functions to avoid text bloat. This was not done here since big.little systems exist in which some CPUs implement LSE while others do not, and ifunc resolution must occur well before this scenario can be detected. It does seem unlikely that FreeBSD will ever run on such platforms, however, so converting atomic(9) to use ifuncs is probably a good next step. Add a LSE_ATOMICS arm64 kernel configuration option to unconditionally select LSE-based atomic(9) implementations when the target system is known. Reviewed by: andrew, kib MFC after: 1 month Sponsored by: The FreeBSD Foundation, Amazon (hardware) Differential Revision: https://reviews.freebsd.org/D23325 |
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| linux | ||
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