linux-kernel - [PATCH v8 09/11] arm64: select ARCH_HAS_OPTIMIZED

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Message-Id: <20240925232425.2763385-10-ankur.a.arora@oracle.com>
Date: Wed, 25 Sep 2024 16:24:23 -0700
From: Ankur Arora <ankur.a.arora@...cle.com>
To: linux-pm@...r.kernel.org, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: catalin.marinas@....com, will@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, pbonzini@...hat.com,
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        joao.m.martins@...cle.com, boris.ostrovsky@...cle.com,
        konrad.wilk@...cle.com
Subject: [PATCH v8 09/11] arm64: select ARCH_HAS_OPTIMIZED_POLL

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@...cle.com>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

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
-- 
2.43.5