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| author | Boqun Feng <boqun@kernel.org> | 2026-08-04 09:14:33 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-08-10 10:50:20 +0200 |
| commit | 264bbd32a31ba80e634bec5c1df8514c0e97fe7e (patch) | |
| tree | f5e619bcd6c0cfa4c08ef7fb6cf22343d4a656d9 | |
| parent | 3b0e2a22d4086ed7c1294584c4417f7d19f1ac67 (diff) | |
| download | linux-264bbd32a31ba80e634bec5c1df8514c0e97fe7e.tar.gz linux-264bbd32a31ba80e634bec5c1df8514c0e97fe7e.zip | |
arm64: sched/preempt: Enable HAS_SEPARATE_PREEMPT_RESCHED_BITS
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
| -rw-r--r-- | arch/arm64/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index b3afe0688919..349c3533cd1e 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -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 |