[PATCH 02/10] lib: genalloc: Generic allocator improvements

Marek Szyprowski m.szyprowski at samsung.com
Fri Jun 10 08:22:05 EDT 2011


On Friday, June 10, 2011 1:25 PM Alan Cox wrote:

> I am curious about one thing
> Why do we need this allocator. Why not use allocate_resource and friends.
> The kernel generic resource handler already handles object alignment and
> subranges. It just seems to be a surplus allocator that could perhaps be
> mostly removed by using the kernel resource allocator we already have ?

genalloc was used mainly for historical reasons (in the earlier version we
were looking for direct replacement for first fit allocator).

I plan to replace it with lib/bitmap.c bitmap_* based allocator (similar like
it it is used by dma_declare_coherent_memory() and friends in
drivers/base/dma-coherent.c). We need something really simple for CMA area

IMHO allocate_resource and friends a bit too heavy here, but good to know 
that such allocator also exists.

Best regards
Marek Szyprowski
Samsung Poland R&D Center

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