riscv: implement __get_kernel_nofault and __put_user_nofault (d464118c) · Commits · 戴 / test

Implement the non-faulting kernel access helpers directly instead of abusing the uaccess routines under set_fs(KERNEL_DS). Signed-off-by:

arch/riscv/include/asm/uaccess.h

+20 −0

Original line number	Diff line number	Diff line
		@@ -486,6 +486,26 @@ unsigned long __must_check clear_user(void __user *to, unsigned long n)
		__ret; \
		})

		#define HAVE_GET_KERNEL_NOFAULT

		#define __get_kernel_nofault(dst, src, type, err_label) \
		do { \
		long __kr_err; \
		\
		__get_user_nocheck(((type )(dst)), (type *)(src), __kr_err); \
		if (unlikely(__kr_err)) \
		goto err_label; \
		} while (0)

		#define __put_kernel_nofault(dst, src, type, err_label) \
		do { \
		long __kr_err; \
		\
		__put_user_nocheck(((type )(dst)), (type *)(src), __kr_err); \
		if (unlikely(__kr_err)) \
		goto err_label; \
		} while (0)

		#else /* CONFIG_MMU */
		#include <asm-generic/uaccess.h>
		#endif /* CONFIG_MMU */