Messages in this thread | | | Date | Mon, 23 Apr 2007 09:34:47 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings |
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Eric W. Biederman wrote: > The only way to ensure this will not happen is to do what we do > on x86_64 and map the new page table page into our address space > before we write to it. Assuming the page we allocate is already > mapped is simply not robust. >
So you mean make alloc_bootmem make sure there's a mapping for the returned page? That would be simple enough, though it might interact strangely with the actual construction of the memory mappings (what if the page alloc_bootmem just allocated for the pagetable is the page pagetable_init is actually trying to map?).
I'm not sure about the issue with holes. I assume you mean that just because head.S maps a chunk of memory, it isn't necessarily available for allocation because its a hole. But does alloc_bootmem know to avoid them anyway? Has it already parsed e820 at that point?
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