riscv/uaccess: Use unsafe wrappers for ASM GOTO

ASM GOTO is miscompiled by GCC when it is used inside a auto cleanup scope:

bool foo(u32 __user *p, u32 val)
{
scoped_guard(pagefault)
unsafe_put_user(val, p, efault);
return true;
efault:
return false;
}

It ends up leaking the pagefault disable counter in the fault path. clang
at least fails the build.

Rename unsafe_*_user() to arch_unsafe_*_user() which makes the generic
uaccess header wrap it with a local label that makes both compilers emit
correct code. Same for the kernel_nofault() variants.

Signed-off-by: Thomas Gleixner <[e-mail]>
Signed-off-by: Peter Zijlstra (Intel) <[e-mail]>
Reviewed-by: Mathieu Desnoyers <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

arch/riscv/include/asm/uaccess.h

···
 		__clear_user(untagged_addr(to), n) : n;
 }
 
-#define __get_kernel_nofault(dst, src, type, err_label)			\
+#define arch_get_kernel_nofault(dst, src, type, err_label)			\
 	__get_user_nocheck(*((type *)(dst)), (__force __user type *)(src), err_label)
 
-#define __put_kernel_nofault(dst, src, type, err_label)			\
+#define arch_put_kernel_nofault(dst, src, type, err_label)			\
 	__put_user_nocheck(*((type *)(src)), (__force __user type *)(dst), err_label)
 
 static __must_check __always_inline bool user_access_begin(const void __user *ptr, size_t len)
···
  * We want the unsafe accessors to always be inlined and use
  * the error labels - thus the macro games.
  */
-#define unsafe_put_user(x, ptr, label)					\
+#define arch_unsafe_put_user(x, ptr, label)				\
 	__put_user_nocheck(x, (ptr), label)
 
-#define unsafe_get_user(x, ptr, label)	do {				\
+#define arch_unsafe_get_user(x, ptr, label)	do {			\
 	__inttype(*(ptr)) __gu_val;					\
 	__get_user_nocheck(__gu_val, (ptr), label);			\
 	(x) = (__force __typeof__(*(ptr)))__gu_val;			\