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

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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>
This commit is contained in:
Christoph Hellwig 2020-09-07 07:58:20 +02:00 committed by Palmer Dabbelt
parent 931de11f5a
commit 2d2d255467
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1 changed files with 16 additions and 0 deletions
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16
include/asm-generic/uaccess.h
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@ -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)
{