From: Paul Burton <paul.burton@xxxxxxxx> [ Upstream commit e84957e6ae043bb83ad6ae7e949a1ce97b6bbfef ] Generate the sync instructions required to workaround Loongson3 LL/SC errata within inline asm blocks, which feels a little safer than doing it from C where strictly speaking the compiler would be well within its rights to insert a memory access between the separate asm statements we previously had, containing sync & ll instructions respectively. Signed-off-by: Paul Burton <paul.burton@xxxxxxxx> Cc: linux-mips@xxxxxxxxxxxxxxx Cc: Huacai Chen <chenhc@xxxxxxxxxx> Cc: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> Cc: linux-kernel@xxxxxxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- arch/mips/kernel/syscall.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c index 69c17b549fd3c..10990434bf946 100644 --- a/arch/mips/kernel/syscall.c +++ b/arch/mips/kernel/syscall.c @@ -37,6 +37,7 @@ #include <asm/signal.h> #include <asm/sim.h> #include <asm/shmparam.h> +#include <asm/sync.h> #include <asm/sysmips.h> #include <asm/switch_to.h> @@ -135,6 +136,7 @@ static inline int mips_atomic_set(unsigned long addr, unsigned long new) " .set "MIPS_ISA_ARCH_LEVEL" \n" " li %[err], 0 \n" "1: \n" + " " __SYNC(full, loongson3_war) " \n" user_ll("%[old]", "(%[addr])") " move %[tmp], %[new] \n" "2: \n" -- 2.20.1