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-rw-r--r--arch/riscv/lib/uaccess.S12
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/riscv/lib/uaccess.S b/arch/riscv/lib/uaccess.S
index 3ab438f30d..bc22c078ab 100644
--- a/arch/riscv/lib/uaccess.S
+++ b/arch/riscv/lib/uaccess.S
@@ -1,8 +1,10 @@
#include <linux/linkage.h>
-#include <asm-generic/export.h>
+#include <linux/export.h>
#include <asm/asm.h>
#include <asm/asm-extable.h>
#include <asm/csr.h>
+#include <asm/hwcap.h>
+#include <asm/alternative-macros.h>
.macro fixup op reg addr lbl
100:
@@ -11,6 +13,13 @@
.endm
SYM_FUNC_START(__asm_copy_to_user)
+#ifdef CONFIG_RISCV_ISA_V
+ ALTERNATIVE("j fallback_scalar_usercopy", "nop", 0, RISCV_ISA_EXT_v, CONFIG_RISCV_ISA_V)
+ REG_L t0, riscv_v_usercopy_threshold
+ bltu a2, t0, fallback_scalar_usercopy
+ tail enter_vector_usercopy
+#endif
+SYM_FUNC_START(fallback_scalar_usercopy)
/* Enable access to user memory */
li t6, SR_SUM
@@ -181,6 +190,7 @@ SYM_FUNC_START(__asm_copy_to_user)
sub a0, t5, a0
ret
SYM_FUNC_END(__asm_copy_to_user)
+SYM_FUNC_END(fallback_scalar_usercopy)
EXPORT_SYMBOL(__asm_copy_to_user)
SYM_FUNC_ALIAS(__asm_copy_from_user, __asm_copy_to_user)
EXPORT_SYMBOL(__asm_copy_from_user)