Messages in this thread Patch in this message | | | From | Christoph Hellwig <> | Subject | [PATCH 7/8] riscv: implement __get_kernel_nofault and __put_user_nofault | Date | Mon, 7 Sep 2020 07:58:24 +0200 |
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Implement the non-faulting kernel access helpers directly instead of abusing the uaccess routines under set_fs(KERNEL_DS).
Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/riscv/include/asm/uaccess.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h index b67d1c616ec348..264e52fb62b143 100644 --- a/arch/riscv/include/asm/uaccess.h +++ b/arch/riscv/include/asm/uaccess.h @@ -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 */ -- 2.28.0
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