Re: [RFC/PATCH] prepare_unmapped_area

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

> Yeah, you're right... Former revisions of the patch created a function
> called is_special_range() which for the moment only called
> is_hugepage_only_range().  The thought was that other types of "special
> ranges" could be checked for in this function.  I guess that's basically
> the same idea as validate_area() below.  That would work for me.
> 
> > I was talking to hch and arjan yesterday on irc and we though about
> > having an mm hook validate_area() that could replace the
> > is_hugepage_only_range() hack and deal with my issue as well. As for
> > having prepare in the fops, do we need it at all if we call fops->g_u_a
> > in the MAP_FIXED case ?
> 
> Nah, if we cleaned up g_u_a() so that it is always called, away goes the
> need for f_ops->prepare_unmapped_area().

Ok, I'll cook up a patch around those lines, possibly next week.

Ben.


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