On Tue, Jan 11, 2005 at 04:07:09PM -0800, Linus Torvalds wrote: > On Tue, 11 Jan 2005, Russell King wrote: > > Any responses on this? Didn't get any last time I mailed this out. > > I don't have any real objections. I'd like it verified that gcc can > compile away all the overhead on the architectures that don't use the pfn, > since "page_to_pfn()" can be a bit expensive otherwise.. But I don't see > anything wrong with the approach.
Thanks for the response. However, apart from Ralph, Paul and yourself, it seems none of the other architecture maintainers care about this patch - the original mail was BCC'd to the architecture list. Maybe that's an implicit acceptance of this patch, I don't know. I do know that page_to_pfn() will generate code on some platforms which don't require it due to them declaring flush_cache_page() as a function. However, I assert that if they don't need this overhead, that's for them to fix up. I don't know all their quirks so it isn't something I can tackle. In other words, unless I actually receive some real help from the other architecture maintainers on this to address your concerns, ARM version 6 CPUs with aliasing L1 caches (== >16K) will remain a dead dodo with mainline Linux kernels. (This mail BCC'd to the architecture list again in the vain hope that someone will offer assistance.) -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/ 2.6 Serial core
