x86, pat: fix warn_on_once() while mapping 0-1MB range with /dev/mem

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Jeff Mahoney reported:

> With Suse's hwinfo tool, on -tip:
> WARNING: at arch/x86/mm/pat.c:637 reserve_pfn_range+0x5b/0x26d()

reserve_pfn_range() is not tracking the memory range below 1MB
as non-RAM and as such is inconsistent with similar checks in
reserve_memtype() and free_memtype()

Rename the pagerange_is_ram() to pat_pagerange_is_ram() and add the
"track legacy 1MB region as non RAM" condition.

And also, fix reserve_pfn_range() to return -EINVAL, when the pfn
range is RAM. This is to be consistent with this API design.

Reported-and-tested-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Suresh Siddha 2009-02-11 11:20:23 -08:00 • committed by Ingo Molnar

parent 4f06b0436b

commit be03d9e802

3 changed files with 45 additions and 58 deletions

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1

arch/x86/include/asm/page.h

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19

arch/x86/mm/ioremap.c

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83

arch/x86/mm/pat.c

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