On Thu, 24 Feb 2000, Ingo Molnar wrote:
>
> (the bug was that we allocated and initialized secondary PAE page tables
> outside the 8MB initial virtual memory - bootmem_alloc_pages() prefers to
> return addresses above 16MB on x86.)
Ingo, there are other problems with the "map only a limited part of the
physical memory" approach: the SMP tables are in high memory on newer
systems from intel etc. Instead of this patch, I'd much rather get a patch
that moves "paging_init()" from init/main.c into setup_arch().
As far as I can see, moving paging_init() into setup_arch() (just before
"init_smp_config()"), should work, and should mean that we have access to
the whole physical address space earlier so that these workarounds
wouldn't be needed. Would you mind taking a look at that alternate
approach instead?
("paging_init()" is really an arch-specific thing anyway: many
architectures do not need any page table setup at all due to having a 1:1
hardware mapping for the kernel address space already, so this makes sense
from a bigger architectural standpoint too, I think).
Linus
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