On Tue, 2009-11-24 at 12:53 +0000, Ralf Baechle wrote: > On Tue, Nov 24, 2009 at 01:39:48PM +1100, Michael Ellerman wrote: > > > Having just hit a build-break caused by a distro building with > > PCI_MSI=n, I set out to make it default y for powerpc. Unfortunately > > that's not possible, because it's in drivers/pci/Kconfig. > > > > So is it time to make it default y for everyone? It seems to me having > > it off is more likely to cause problems than having it on these days, > > though I'm not sure if that is true for all archs. > > > > An arch that really didn't want it default y could conditionally select > > ARCH_SUPPORTS_MSI, like x86 does already. > > On MIPS the age of MSI only recently started; once single platform (Cavium) > out of all the many uses it. Cavium does a "select ARCH_SUPPORTS_MSI" but > not "select PCI_MSI" because not all platform variants actually have PCI. > > We should not give a user a chance to select something wrong in kconfig > thus automatically as many options for a platform as possible is a good > thing - after all the kconfig dialog for any given platfrom has become > painfully long. And we really should have to avoid users having to know > that the Frobnic 2000 they're trying to upgrade the kernel for requires > MSI to work ... Still... select has nasty issues. I think default y is fine here. For platforms that don't need it, make sure their defconfigs don't have it set... Or maybe default y if (X86 || PPC) Cheers, Ben.
