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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
This commit is contained in:
Boqun Feng
2026-08-04 09:14:33 -07:00
committed by Peter Zijlstra
parent 3b0e2a22d4
commit 264bbd32a3
1 changed files with 1 additions and 0 deletions
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1
arch/arm64/Kconfig
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@@ -247,6 +247,7 @@ config ARM64
select PCI_SYSCALL if PCI
select POWER_RESET
select POWER_SUPPLY
select HAS_SEPARATE_PREEMPT_RESCHED_BITS
select SPARSE_IRQ
select SWIOTLB
select SYSCTL_EXCEPTION_TRACE