arm64: sched/preempt: Enable HAS_SEPARATE_PREEMPT_RESCHED_BITS

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Arm64 already uses 64-bit preempt count and the need reschedule bit is
maintained in a separate 32-bit word from the preempt count. Therefore
preempt count has enough bits to represent 16 levels of NMI nesting,
hence enable it for arm64. This saves a per-CPU variable and additional
instructions in the NMI path.

Signed-off-by: Boqun Feng <boqun@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260804161447.84806-12-boqun@kernel.org

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Boqun Feng 2026-08-04 09:14:33 -07:00 • committed by Peter Zijlstra

parent 3b0e2a22d4

commit 264bbd32a3

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