[PATCH V2] arm: mm: Remove hugetlb warning from Coherent DMA allocator

[Russell King - ARM Linux]

On Tue, Feb 18, 2014 at 03:45:51PM +0000, Steve Capper wrote:
> On Thu, Jan 16, 2014 at 10:07:43AM +0000, Steve Capper wrote:
> > The Coherant DMA allocator allocates pages of high order then splits
> > them up into smaller pages.
> > 
> > This splitting logic would run into problems if the allocator was
> > given compound pages. Thus the Coherant DMA allocator was originally
> > incompatible with compound pages existing and, by extension, huge
> > pages. A compile #error was put in place whenever huge pages were
> > enabled.
> > 
> > Compatibility with compound pages has since been introduced by the
> > following commit (which merely excludes GFP_COMP pages from being
> > requested by the coherant DMA allocator):
> >   ea2e705 ARM: 7172/1: dma: Drop GFP_COMP for DMA memory allocations
> > 
> > When huge page support was introduced to ARM, the compile #error in
> > dma-mapping.c was replaced by a #warning when it should have been
> > removed instead.
> > 
> > This patch removes the compile #warning in dma-mapping.c when huge
> > pages are enabled.
> > 
> > Signed-off-by: Steve Capper <steve.capper at linaro.org>
> > ---
> > Changed in V2: commit message completely re-written to give a better
> > justification.
> > ---
> >  arch/arm/mm/dma-mapping.c | 3 ---
> >  1 file changed, 3 deletions(-)
> 
> Would anyone object to this going into Russell's patch system?

It's been a month, no one's objected, so please put it in the patch
system anyway, thanks.

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