PLEA: Please fix mach/gpio.h includes (was: Re: [RFC PATCH 2/2] GPIO: add gpiolib and irqchip for CSR SiRFprimaII GPIO controller)

[arnd@arndb.de (Arnd Bergmann)]

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