Re: [PATCH] sfc_ef100: Fix build failure on powerpc

On Thu, Aug 13, 2020 at 02:39:10PM +0000, Christophe Leroy wrote:

ppc6xx_defconfig fails building sfc.ko module, complaining
about the lack of _umoddi3 symbol.

This is due to the following test

 		if (EFX_MIN_DMAQ_SIZE % reader->value) {

Because reader->value is u64.

As EFX_MIN_DMAQ_SIZE value is 512, reader->value is obviously small
enough for an u32 calculation, so cast it as (u32) for the test, to
avoid the need for _umoddi3.

That isn't the same e.g. if reader->value is 2**32 + small.  Which
probably cannot happen, but :-)


Segher