linux-kernel - [PATCH v2 3/4] MIPS: Select ARCH_SUPPORTS_ATOMIC

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Message-Id: <20240612-mips-llsc-v2-3-a42bd5562bdb@flygoat.com>
Date: Wed, 12 Jun 2024 10:53:31 +0100
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Jonas Gorski <jonas.gorski@...il.com>, 
 "Maciej W. Rozycki" <macro@...am.me.uk>, linux-mips@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH v2 3/4] MIPS: Select ARCH_SUPPORTS_ATOMIC_RMW when possible

Select ARCH_SUPPORTS_ATOMIC_RMW when we are certain that our CPU
have LLSC support.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/mips/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 50260a7e9b54..e83036580a47 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -23,6 +23,7 @@ config MIPS
 	select ARCH_USE_MEMTEST
 	select ARCH_USE_QUEUED_RWLOCKS
 	select ARCH_USE_QUEUED_SPINLOCKS
+	select ARCH_SUPPORTS_ATOMIC_RMW if CPU_HAS_LLSC
 	select ARCH_SUPPORTS_HUGETLBFS if CPU_SUPPORTS_HUGEPAGES
 	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
 	select ARCH_WANT_IPC_PARSE_VERSION

-- 
2.43.0