Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings

Eric W. Biederman wrote:

I happened to be looking at this stretch of code and I have realized
that this is quite simply the wrong fix.

The problem is that it depends intimately on the details of
alloc_bootmem_pages_low.  Essentially the problem is that when
we are setting up the identity mappings in paging_init we assume
the identity mappings already exist.

If there are holes in the memory map or someone changes the way
pages are returned from alloc_bootmem_pages_low() this code
will break again.

How would holes in the memory map affect it?

	-hpa
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• References:
  • [PATCH 00/28] Updates for firstfloor paravirt-ops patches
    • From: Jeremy Fitzhardinge <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: Andi Kleen <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: Andi Kleen <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: Chuck Ebbert <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: Jeremy Fitzhardinge <[email protected]>
  • Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings
    • From: [email protected] (Eric W. Biederman)

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