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[v6,7/9] sparc: qspinlock: Add ARCH_USE_QUEUED_SPINLOCKS_XCHG32

Message ID 1617201040-83905-8-git-send-email-guoren@kernel.org
State New
Headers show
Series riscv: Add qspinlock/qrwlock | expand

Commit Message

Guo Ren March 31, 2021, 2:30 p.m. UTC 
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(+)
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Patch

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