[PATCH] dmaengine: mv_xor: Add support for IO (PCIe) src/dst areas

[Thomas Petazzoni]

Hello,

On Wed, 24 Aug 2016 10:23:02 +0200, Stefan Roese wrote:

> > All errors (new ones prefixed by >>):
> > 
> >    drivers/built-in.o: In function `set_param_ifnum':  
> >>> ipmi_poweroff.c:(.text+0x10157c): undefined reference to `mvebu_mbus_get_io_win_info'  
> >    drivers/built-in.o: In function `mv_xor_add_io_win':
> >    mv_xor.c:(.text+0x11039e): undefined reference to `mvebu_mbus_get_io_win_info'  
> 
> Does it really make sense to compile this driver for all archs?
> Or should I send a v2 of this patch that removes COMPILE_TEST for
> this driver from Kconfig so that its only compiled for the
> target platforms?

I'm not sure what's the exact policy, but I believe kernel maintainers
like when the compilation coverage is as wide as possible. The MBus
driver could provide some stub functions when not enabled? I don't know
if it's worth it, since indeed mv_xor is only ever going to be used on
ARM.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com