diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-09-07 07:58:24 +0200 |
|---|---|---|
| committer | Palmer Dabbelt <palmerdabbelt@google.com> | 2020-10-04 10:27:09 -0700 |
| commit | d464118cdc4156c3f356507ea0f5ea0dc5be6c3d (patch) | |
| tree | abab349b76c8fe1a117e1f9afb419aea145d43e1 | |
| parent | f289a34811d8fff29f304e14f7edd4576ed9b598 (diff) | |
riscv: implement __get_kernel_nofault and __put_user_nofault
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>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
| -rw-r--r-- | arch/riscv/include/asm/uaccess.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h index b67d1c616ec3..264e52fb62b1 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 */ |