[PATCH 5.5 081/367] MIPS: asm: local: add barriers for Loongson

[Greg Kroah-Hartman]

From: Wang Xuerui <git@xxxxxxxxxx>

commit 3e86460ebe2340df6a33b35a55312cc369bdcbd0 upstream.

Somehow these LL/SC usages are not taken care of, breaking Loongson
builds. Add the SYNCs appropriately.

Signed-off-by: Wang Xuerui <git@xxxxxxxxxx>
Signed-off-by: Paul Burton <paulburton@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxxx
Cc: Huacai Chen <chenhc@xxxxxxxxxx>
Cc: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v5.5+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/mips/include/asm/local.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/mips/include/asm/local.h
+++ b/arch/mips/include/asm/local.h
@@ -37,6 +37,7 @@ static __inline__ long local_add_return(
 		__asm__ __volatile__(
 		"	.set	push					\n"
 		"	.set	arch=r4000				\n"
+			__SYNC(full, loongson3_war) "			\n"
 		"1:"	__LL	"%1, %2		# local_add_return	\n"
 		"	addu	%0, %1, %3				\n"
 			__SC	"%0, %2					\n"
@@ -52,6 +53,7 @@ static __inline__ long local_add_return(
 		__asm__ __volatile__(
 		"	.set	push					\n"
 		"	.set	"MIPS_ISA_ARCH_LEVEL"			\n"
+			__SYNC(full, loongson3_war) "			\n"
 		"1:"	__LL	"%1, %2		# local_add_return	\n"
 		"	addu	%0, %1, %3				\n"
 			__SC	"%0, %2					\n"
@@ -84,6 +86,7 @@ static __inline__ long local_sub_return(
 		__asm__ __volatile__(
 		"	.set	push					\n"
 		"	.set	arch=r4000				\n"
+			__SYNC(full, loongson3_war) "			\n"
 		"1:"	__LL	"%1, %2		# local_sub_return	\n"
 		"	subu	%0, %1, %3				\n"
 			__SC	"%0, %2					\n"
@@ -99,6 +102,7 @@ static __inline__ long local_sub_return(
 		__asm__ __volatile__(
 		"	.set	push					\n"
 		"	.set	"MIPS_ISA_ARCH_LEVEL"			\n"
+			__SYNC(full, loongson3_war) "			\n"
 		"1:"	__LL	"%1, %2		# local_sub_return	\n"
 		"	subu	%0, %1, %3				\n"
 			__SC	"%0, %2					\n"