asm-generic: add nommu implementations of __{get,put}_kernel_nofault

Add native implementations of __{get,put}_kernel_nofault using
{get,put}_unaligned, just like the {get,put}_user implementations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h
index 6de5f52..b367f33 100644 (file)
--- a/include/asm-generic/uaccess.h
+++ b/include/asm-generic/uaccess.h
@@ -61,6 +61,22 @@ static inline int __put_user_fn(size_t size, void __user *to, void *from)
 }
 #define __put_user_fn(sz, u, k)        __put_user_fn(sz, u, k)
 
+#define __get_kernel_nofault(dst, src, type, err_label)                        \
+do {                                                                   \
+       *((type *)dst) = get_unaligned((type *)(src));                  \
+       if (0) /* make sure the label looks used to the compiler */     \
+               goto err_label;                                         \
+} while (0)
+
+#define __put_kernel_nofault(dst, src, type, err_label)                        \
+do {                                                                   \
+       put_unaligned(*((type *)src), (type *)(dst));                   \
+       if (0) /* make sure the label looks used to the compiler */     \
+               goto err_label;                                         \
+} while (0)
+
+#define HAVE_GET_KERNEL_NOFAULT 1
+
 static inline __must_check unsigned long
 raw_copy_from_user(void *to, const void __user * from, unsigned long n)
 {