On Tue, Oct 16, 2018 at 5:05 AM Guo Ren <ren_guo@xxxxxxxxx> wrote:
>
> The patch adds "user access from kernel" codes.
>
> Signed-off-by: Guo Ren <ren_guo@xxxxxxxxx>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> ---
> arch/csky/include/asm/uaccess.h | 416 ++++++++++++++++++++++++++++++++++++++++
> arch/csky/lib/usercopy.c | 262 +++++++++++++++++++++++++
> 2 files changed, 678 insertions(+)
> create mode 100644 arch/csky/include/asm/uaccess.h
> create mode 100644 arch/csky/lib/usercopy.c
Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
The 64-bit __put_user() is usually what everyone gets wrong, but
your version seems fine. Also the access_ok() checks and
the copy_to_user() result value all look correct.
Arnd
