Re: [PATCH 4/5] arch/kmap_atomic: Consolidate duplicate code

[Christoph Hellwig]

On Sun, Apr 26, 2020 at 06:16:30PM -0700, Ira Weiny wrote:
> > That might require to support
> > kmap_atomic_prot everywhere first, which sounds like a really good
> > idea anyway, and would avoid the need for strange workaround in drm.
> 
> Having a kmap_atomic_prot() seems like a good idea.  But I'm not exactly sure
> why CONFIG_x86 is being called out specifically in the DRM code?

Probably because it only existed on x86 back then.  And drm has a
tendency of working around core problems with hacks instead of doing
the fairly easy fixups.