[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 <redacted>
---
 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