remove set_fs for riscv v2

[Palmer Dabbelt]

On Sun, 06 Sep 2020 22:58:17 PDT (-0700), Christoph Hellwig wrote:
> Hi all,
>
> this series converts riscv to the new set_fs less world and is on top of this
> branch:
>
>     https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git/log/?h=base.set_fs
>
> The first four patches are general improvements and enablement for all nommu
> ports, and might make sense to merge through the above base branch.

Seems like it to me.  These won't work without the SET_FS code so I'm OK if you
guys want to keep them all together.  Otherwise I think I'd need to wait until
the SET_FS stuff gets merged before taking any of these, which would be a bit
of a headache.

Thanks!

> Changes since v1:
>  - implement __get_user_fn and __put_user_fn for the UACCESS_MEMCPY case
>    and remove the small constant size optimizations in raw_copy_from_user
>    and raw_copy_to_user
>  - reshuffle the patch order a little
>
> Diffstat
>  arch/riscv/Kconfig                   |    2
>  arch/riscv/include/asm/thread_info.h |    6 -
>  arch/riscv/include/asm/uaccess.h     |  177 +++++++++++++++++------------------
>  arch/riscv/kernel/process.c          |    1
>  arch/riscv/lib/Makefile              |    2
>  include/asm-generic/uaccess.h        |  109 +++++++++++++--------
>  include/linux/uaccess.h              |    4
>  7 files changed, 166 insertions(+), 135 deletions(-)