Re: [patch V4 2/8] mm/highmem: Provide CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP

[Mel Gorman]

On Wed, Nov 18, 2020 at 01:13:57PM -0800, Linus Torvalds wrote:
> On Wed, Nov 18, 2020 at 12:58 PM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> >
> > Provide CONFIG_DEBUG_KMAP_LOCAL_FORCE_MAP which forces the temporary
> > mapping even for lowmem pages. This needs to be a seperate config switch
> > because this only works on architectures which do not have cache aliasing
> > problems.
> 
> Very good. And you made sure to have a comment to not enable it for
> production systems.
> 
> Hopefully people will even read it ;)
> 

And not start thinking it as a security hardening option.

-- 
Mel Gorman
SUSE Labs