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x86: introduce max_low_pfn_mapped for 64-bit

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when more than 4g memory is installed, don't map the big hole below 4g.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu
2008-07-10 20:38:26 -07:00
committed by Ingo Molnar
parent f302a5bbe5
commit f361a450bf
12 changed files with 74 additions and 17 deletions
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arch/x86/kernel/acpi/boot.c
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@@ -130,7 +130,7 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size)
if (!phys || !size)
return NULL;
if (phys+size <= (max_pfn_mapped << PAGE_SHIFT))
if (phys+size <= (max_low_pfn_mapped << PAGE_SHIFT))
return __va(phys);
offset = phys & (PAGE_SIZE - 1);