From: Palmer Dabbelt <palmer@sifive.com>
Date: Tue, 28 Nov 2017 22:05:04 +0000 (-0800)
Subject: RISC-V: Add READ_ONCE in arch_spin_is_locked()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=21db403660d1433b8a02b26d5d4084921b857c40;p=openwrt%2Fstaging%2Fblogic.git

RISC-V: Add READ_ONCE in arch_spin_is_locked()

This was just incorrect in the original version.

Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
---

diff --git a/arch/riscv/include/asm/spinlock.h b/arch/riscv/include/asm/spinlock.h
index 04c71d938afd..a6a005c4f2fb 100644
--- a/arch/riscv/include/asm/spinlock.h
+++ b/arch/riscv/include/asm/spinlock.h
@@ -24,7 +24,7 @@
 
 /* FIXME: Replace this with a ticket lock, like MIPS. */
 
-#define arch_spin_is_locked(x)	((x)->lock != 0)
+#define arch_spin_is_locked(x)	(READ_ONCE((x)->lock) != 0)
 
 static inline void arch_spin_unlock(arch_spinlock_t *lock)
 {