Re: [patch 2/5] sparse-vmemmap: specify vmemmap population rangein bytes

[David Miller]

From: Johannes Weiner <hannes@xxxxxxxxxxx>
Date: Wed, 20 Mar 2013 14:03:29 -0400

> The sparse code, when asking the architecture to populate the vmemmap,
> specifies the section range as a starting page and a number of pages.
> 
> This is an awkward interface, because none of the arch-specific code
> actually thinks of the range in terms of 'struct page' units and
> always translates it to bytes first.
> 
> In addition, later patches mix huge page and regular page backing for
> the vmemmap.  For this, they need to call vmemmap_populate_basepages()
> on sub-section ranges with PAGE_SIZE and PMD_SIZE in mind.  But these
> are not necessarily multiples of the 'struct page' size and so this
> unit is too coarse.
> 
> Just translate the section range into bytes once in the generic sparse
> code, then pass byte ranges down the stack.
> 
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>

Boot tested on sparc64:

Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
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