Re: [PATCH 2/4] mm: introduce mm_forbids_zeropage function

[Andrew Morton]

On Wed, 22 Oct 2014 21:45:52 +0200 Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx> wrote:

> > > +#ifndef mm_forbids_zeropage
> > > +#define mm_forbids_zeropage(X)  (0)
> > > +#endif
> > 
> > Can we document this please?  What it does, why it does it.  We should
> > also specify precisely which arch header file is responsible for
> > defining mm_forbids_zeropage.
> > 
> 
> I will add a comment like:
> 
> /*
>  * To prevent common memory management code establishing
>  * a zero page mapping on a read fault.
>  * This function should be implemented within <asm/pgtable.h>.

s/function should be implemented/macro should be defined/

>  * s390 does this to prevent multiplexing of hardware bits
>  * related to the physical page in case of virtualization.
>  */
> 
> Okay?

Looks great, thanks.
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