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From: Ankur Arora <ankur.a.arora@oracle.com>
To: linux-pm@vger.kernel.org, kvm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de,
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misono.tomohiro@fujitsu.com, maobibo@loongson.cn,
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Subject: [PATCH v8 09/11] arm64: select ARCH_HAS_OPTIMIZED_POLL
Date: Wed, 25 Sep 2024 16:24:23 -0700
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| Series |
Enable haltpoll on arm64
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expand
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diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 49f054dcd4de..ef9c22c3cff2 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -38,6 +38,7 @@ config ARM64 select ARCH_HAS_MEM_ENCRYPT select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE + select ARCH_HAS_OPTIMIZED_POLL select ARCH_HAS_PTE_DEVMAP select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_HW_PTE_YOUNG
poll_idle() uses smp_cond_load*() as its polling mechanism. arm64 supports an optimized version of this via LDXR, WFE, with LDXR loading a memory region in exclusive state and the WFE waiting for any stores to it. Select ARCH_HAS_OPTIMIZED_POLL so poll_idle() can be used. Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com> --- arch/arm64/Kconfig | 1 + 1 file changed, 1 insertion(+)