[PATCH 4/6] [v2] arc: use generic strncpy/strnlen from_user

[Christoph Hellwig]

On Sat, May 15, 2021 at 12:18:01PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd at arndb.de>
> 
> Most per-architecture versions of these functions are broken
> in some form, and they are almost certainly slower than the
> generic code as well.
> 
> This version is fairly slow because it always does byte accesses
> even for aligned data, and its checks for user_addr_max() differ
> from the generic code.
> 
> Remove the ones for arc and instead use the generic version.

Same comment as for hexaon before.