At Wed, 12 May 2010 13:05:54 +1200, Eliot Blennerhassett wrote:

Hi Takashi,

since the acceptance of asihpi driver, and move to alsa-kernel, you created a couple of patch files in alsa-driver/pci/asihpi (that add conditional compilation for older kernels)

Can you tell me how these patches are generated and maintained? (I guess this applies to any driver with this kind of patch).

This is simply a diff against to the corresponding file in alsa-kernel tree. If older kernels require some changes (e.g. ifdef's), we patch it locally in alsa-driver tree at building.

In the case of asihpi, it's generated like:

% cd alsa-driver/pci/asihpi % diff -u ../../alsa-kernel/pci/asihpi/hpios.c hpios.c > hpios.patch

I think that this arrangement means that my one upstream file needs to be converted to two files (kernel .c + patch) when I submit updates?

If your change in the kernel conflicts with the existing patch, yes, it'd be appreciated if you give the patch, too. Usually I make a patch by myself.

thanks,

Takashi