On Tuesday 09 August 2011, Barry Song wrote:

I guess same issues exist for other hardwares except GPIO. For
example, almost every different SoC has different DMA API, for
example:
mach-bcmring/dma.c:EXPORT_SYMBOL(dma_alloc_descriptor_ring);
mach-davinci/dma.c:EXPORT_SYMBOL(edma_alloc_channel);
mach-davinci/dma.c:EXPORT_SYMBOL(edma_clear_event);
mach-imx/dma-v1.c:EXPORT_SYMBOL(imx_dma_setup_single);
mach-s3c64xx/dma.c:EXPORT_SYMBOL(s3c2410_dma_enqueue);

Do we also want to delete all arch/arm/mach-xxx/include/mach/dma.h?

We need to eliminate all header files that have conflicting names
and that are used by drivers or other header files outside of mach-*.
How we get there is very different for each of these headers.

Or do we want to delete the whole arch/arm/mach-xxx/include/mach directory?

Ideally, yes. However, that will take a lot of time. Meanwhile, we should
rename the individual header files to have unique names for each API,
and ensure that the symbols don't clash.

If not, it is probably that SoC can still hold some chip-specific APIs
in arch/arm/mach-xxx/include/mach/yyy.h.

Can you name an example? Most of the ones I can think of will not work
in a multiplatform kernel.

	Arnd