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Followup to: <m1vflp81kq.fsf@ebiederm.dsl.xmission.com> By author: ebiederm@xmission.com (Eric W. Biederman) In newsgroup: linux.dev.kernel > > I think I have accounted for the sub architectures but I don't have > the hardware to test them. For voyager and VISWS I actually changed > some code so I would appreciate a confirmation I didn't break > anything. > For VISWS I think you actually need to turn paging off explicitly. Also, you probably need to check that you didn't break 4G/4G, especially on SMP. I would also like to remove the magic %bx, which I did in the version of my patch sent to akpm and which is now in -mm (basically the SMP trampoline jumps to a different entrypoint instead.) In that patch, %ebx is still used as a flag, but it's completely internal to head.S. See ftp://ftp.kernel.org/pub/linux/kernel/people/hpa/earlymem-7.diff > Thanks to HPA who got the ball started :) :) I definitely agree that simply using no paging until we have page tables is by far the cleanest approach. I felt that is was too high risk for 2.6, basically because I'm a chicken, but more realistically because I couldn't really see the effect on all subarchitectures, and I didn't feel 100% confident that there wasn't anything that relied on memory being dual mapped; however, I'm more than happy to be proven wrong :) Oh yes, with this change you should probably just move swapper_pg_dir (and empty_zero_page?) into .bss like anything else that should be zero after boot. -hpa - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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