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x86: fix WARN_ON() message: teach page_is_ram() about the special 4Kb bios data page

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This patch teaches page_is_ram() about the fact that the first
4Kb of memory are special on x86, even though the E820 table
normally doesn't exclude it.

This fixes the WARN_ON() reported by Laurent Riffard who was also
very helpful in diagnosing the issue.

[ mingo@elte.hu: we are working on doing this properly in the e820
  space, but for 2.6.25 this is the better fix. ]

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Arjan van de Ven 2008-02-18 09:54:33 -08:00 committed by Ingo Molnar
parent 7c6357da11
commit d8a9e6a51e
1 changed files with 9 additions and 0 deletions
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9
arch/x86/mm/ioremap.c
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@ -42,6 +42,15 @@ int page_is_ram(unsigned long pagenr)
unsigned long addr, end; unsigned long addr, end;
int i; int i;
/*
* A special case is the first 4Kb of memory;
* This is a BIOS owned area, not kernel ram, but generally
* not listed as such in the E820 table.
*/
if (pagenr == 0)
return 0;
for (i = 0; i < e820.nr_map; i++) { for (i = 0; i < e820.nr_map; i++) {
/* /*
* Not usable memory: * Not usable memory: