From: guoren@kernel.org
To: guoren@kernel.org
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>
Subject: [PATCH v5 6/7] sparc: qspinlock: Add ARCH_USE_QUEUED_SPINLOCKS_XCHG32
Date: Sun, 28 Mar 2021 06:30:27 +0000 [thread overview]
Message-ID: <1616913028-83376-7-git-send-email-guoren@kernel.org> (raw)
In-Reply-To: <1616913028-83376-1-git-send-email-guoren@kernel.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
next prev parent reply other threads:[~2021-03-28 6:34 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-28 6:30 [PATCH v5 0/7] riscv: Add qspinlock/qrwlock guoren
2021-03-28 6:30 ` [PATCH v5 1/7] locking/qspinlock: Add ARCH_USE_QUEUED_SPINLOCKS_XCHG32 guoren
2021-03-28 6:30 ` [PATCH v5 2/7] riscv: Convert custom spinlock/rwlock to generic qspinlock/qrwlock guoren
2021-03-28 6:30 ` [PATCH v5 3/7] csky: " guoren
2021-03-28 6:30 ` [PATCH v5 4/7] powerpc/qspinlock: Add ARCH_USE_QUEUED_SPINLOCKS_XCHG32 guoren
2021-03-28 11:14 ` Christophe Leroy
2021-03-28 11:36 ` Guo Ren
2021-03-28 6:30 ` [PATCH v5 5/7] openrisc: qspinlock: " guoren
2021-03-28 6:30 ` guoren [this message]
2021-03-28 6:30 ` [PATCH v5 7/7] xtensa: " guoren
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