From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
The traditional rv32 Linux (s32ilp32) uses a generic version of the
lib/atomic64.c, which are inaccurate atomic64 primitives and couldn't
co-work with READ_ONCE/WRITE_ONCE, atomic_8/16/32. The s64ilp32 could
use native AMO instructions to implement accurate atomic64 primitives.
Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
Signed-off-by: Guo Ren <guoren@xxxxxxxxxx>
---
arch/riscv/Kconfig | 2 +-
arch/riscv/include/asm/atomic.h | 6 ++++++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index f364d2436b1d..0fc03aa076e6 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -65,7 +65,7 @@ config RISCV
select CPU_PM if CPU_IDLE || HIBERNATION
select EDAC_SUPPORT
select GENERIC_ARCH_TOPOLOGY
- select GENERIC_ATOMIC64 if !64BIT
+ select GENERIC_ATOMIC64 if ARCH_RV32I
select GENERIC_CLOCKEVENTS_BROADCAST if SMP
select GENERIC_EARLY_IOREMAP
select GENERIC_ENTRY
diff --git a/arch/riscv/include/asm/atomic.h b/arch/riscv/include/asm/atomic.h
index f5dfef6c2153..8f6579b33ecc 100644
--- a/arch/riscv/include/asm/atomic.h
+++ b/arch/riscv/include/asm/atomic.h
@@ -16,6 +16,12 @@
# endif
#endif
+#ifdef CONFIG_ARCH_RV64ILP32
+typedef struct {
+ s64 counter;
+} atomic64_t;
+#endif
+
#include <asm/cmpxchg.h>
#include <asm/barrier.h>
--
2.36.1
