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Make AtomicTracker use AtomicFlag instead of Atomic<bool> to avoid slow byte-sized RMWs on architectures that don't support them. Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Signed-off-by: Boqun Feng <boqun@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Gary Guo <gary@garyguo.net> Link: https://patch.msgid.link/20260129122622.3896144-3-tomo@aliasing.net Link: https://patch.msgid.link/20260303201701.12204-10-boqun@kernel.org