[Xen-devel] Re: [PATCH 2/3] mm: Add SECTION_ALIGN_UP() and SECTION_ALIGN_DOWN() macro

[David Rientjes <rientjes@xxxxxxxxxx>]

On Tue, 29 Mar 2011, Daniel Kiper wrote:

> > These are only valid for CONFIG_SPARSEMEM, so they need to be defined 
> > conditionally.
> 
> OK, however, I think that pfn_to_section_nr()/section_nr_to_pfn()
> should be defined conditionally, too.
> 

Yes, and you could try removing this from include/linux/mm.h:

#ifndef PFN_SECTION_SHIFT
#define PFN_SECTION_SHIFT 0 
#endif

then we'll reveal anything using these conversion macros that don't rely 
on sparsemem.

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