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SubjectRe: [PATCH V2 2/2] mm/highmem: Lift memcpy_[to|from]_page to core
On Tue, Dec 08, 2020 at 12:23:16PM +0000, Matthew Wilcox wrote:
> On Mon, Dec 07, 2020 at 02:57:03PM -0800, ira.weiny@intel.com wrote:
> > Placing these functions in 'highmem.h' is suboptimal especially with the
> > changes being proposed in the functionality of kmap. From a caller
> > perspective including/using 'highmem.h' implies that the functions
> > defined in that header are only required when highmem is in use which is
> > increasingly not the case with modern processors. Some headers like
> > mm.h or string.h seem ok but don't really portray the functionality
> > well. 'pagemap.h', on the other hand, makes sense and is already
> > included in many of the places we want to convert.
>
> pagemap.h is for the page cache. It's not for "random page
> functionality". Yes, I know it's badly named. No, I don't want to
> rename it. These helpers should go in highmem.h along with zero_user().

I could have sworn you suggested pagemap.h. But I can't find the evidence on
lore. :-/ hehehe...

In the end the code does not care. I have a distaste for highmem.h because it
is no longer for 'high memory'. And I think a number of driver writers who are
targeting 64bit platforms just don't care any more. So as we head toward
memory not being mapped by the kernel for other reasons I think highmem needs
to be 'rebranded' if not renamed.

Ira

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