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

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Message-Id: <20240612-mips-llsc-v2-4-a42bd5562bdb@flygoat.com>
Date: Wed, 12 Jun 2024 10:53:32 +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 4/4] MIPS: Select ARCH_HAVE_NMI_SAFE_CMPXCHG when
 possible

LLSC based CMPXCHG is safe for NMI.

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 e83036580a47..1bb274c50636 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -17,6 +17,7 @@ config MIPS
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_HAS_UBSAN
 	select ARCH_HAS_GCOV_PROFILE_ALL
+	select ARCH_HAVE_NMI_SAFE_CMPXCHG if CPU_HAS_LLSC
 	select ARCH_KEEP_MEMBLOCK
 	select ARCH_USE_BUILTIN_BSWAP
 	select ARCH_USE_CMPXCHG_LOCKREF if 64BIT

-- 
2.43.0