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From: guoren@kernel.org
To: guoren@kernel.org
Subject: [PATCH v5 6/7] sparc: qspinlock: Add ARCH_USE_QUEUED_SPINLOCKS_XCHG32
Date: Sun, 28 Mar 2021 06:30:27 +0000
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Cc: linux-arch@vger.kernel.org, linux-xtensa@linux-xtensa.org,
 Guo Ren <guoren@linux.alibaba.com>, Arnd Bergmann <arnd@arndb.de>,
 Rob Gardner <rob.gardner@oracle.com>, linux-kernel@vger.kernel.org,
 linux-csky@vger.kernel.org, openrisc@lists.librecores.org,
 sparclinux@vger.kernel.org, linux-riscv@lists.infradead.org,
 linuxppc-dev@lists.ozlabs.org, "David S . Miller" <davem@davemloft.net>
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

From: Guo Ren <guoren@linux.alibaba.com>

We don't have native hw xchg16 instruction, so let qspinlock
generic code to deal with it.

Using the full-word atomic xchg instructions implement xchg16 has
the semantic risk for atomic operations.

This patch cancels the dependency of on qspinlock generic code on
architecture's xchg16.

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Rob Gardner <rob.gardner@oracle.com>
---
 arch/sparc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 164a5254c91c..1079fe3f058c 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -91,6 +91,7 @@ config SPARC64
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select ARCH_USE_QUEUED_RWLOCKS
 	select ARCH_USE_QUEUED_SPINLOCKS
+	select ARCH_USE_QUEUED_SPINLOCKS_XCHG32
 	select GENERIC_TIME_VSYSCALL
 	select ARCH_CLOCKSOURCE_DATA
 	select ARCH_HAS_PTE_SPECIAL
-- 
2.17.1