Subject: [PATCH v6 8/9] xtensa: qspinlock: Add ARCH_USE_QUEUED_SPINLOCKS_XCHG32

From: [email-masked]
Date: Wed, 31 Mar 2021 14:30:39 +0000

From: Guo Ren <[email-masked]>

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 <[email-masked]>
Cc: Arnd Bergmann <[email-masked]>
Cc: Chris Zankel <[email-masked]>
Cc: Max Filippov <[email-masked]>
---
 arch/xtensa/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 9ad6b7b82707..f19d780638f7 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -9,6 +9,7 @@ config XTENSA
 	select ARCH_HAS_DMA_SET_UNCACHED if MMU
 	select ARCH_USE_QUEUED_RWLOCKS
 	select ARCH_USE_QUEUED_SPINLOCKS
+	select ARCH_USE_QUEUED_SPINLOCKS_XCHG32
 	select ARCH_WANT_FRAME_POINTERS
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select BUILDTIME_TABLE_SORT
-- 
2.17.1