Hi Andrew,

After merging the akpm-current tree, today's linux-next build (arm
defconfig) failed like this:

In file included from /scratch/sfr/next/arch/arm/mm/dma-mapping.c:29:0:
/scratch/sfr/next/include/linux/cma.h:8:28: error: 'CONFIG_CMA_AREAS' undeclared here (not in a function)
 #define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS)
                            ^
/scratch/sfr/next/arch/arm/mm/dma-mapping.c:434:54: note: in expansion of macro 'MAX_CMA_AREAS'
 static struct dma_contig_early_reserve dma_mmu_remap[MAX_CMA_AREAS] __initdata;
                                                      ^

Caused by commit f495d267b2e0 ("CMA: generalize CMA reserved area
management functionality").

I have reverted that commit and these commits that depend on it

57d551e70a38 ("mm, CMA: clean-up log message")
d75ab106aef5 ("mm, CMA: change cma_declare_contiguous() to obey coding convention")
f693a5424631 ("mm, CMA: clean-up CMA allocation error path")
e58e263e5254 ("PPC, KVM, CMA: use general CMA reserved area management framework")

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au