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[PATCH] x86: fix amd64-agp aperture validation

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Under CONFIG_DISCONTIGMEM, assuming that a !pfn_valid() implies all
subsequent pfn-s are also invalid is wrong. Thus replace this by
explicitly checking against the E820 map.

AK: make e820 on x86-64 not initdata

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Mark Langsdorf <mark.langsdorf@amd.com>
This commit is contained in:
Jan Beulich
2007-05-02 19:27:11 +02:00
committed by Andi Kleen
parent b00742d399
commit b92e9fac40
4 changed files with 28 additions and 11 deletions
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20
arch/i386/kernel/e820.c
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@@ -825,6 +825,26 @@ void __init limit_regions(unsigned long long size)
print_memory_map("limit_regions endfunc");
}
/*
* This function checks if any part of the range <start,end> is mapped
* with type.
*/
int
e820_any_mapped(u64 start, u64 end, unsigned type)
{
int i;
for (i = 0; i < e820.nr_map; i++) {
const struct e820entry *ei = &e820.map[i];
if (type && ei->type != type)
continue;
if (ei->addr >= end || ei->addr + ei->size <= start)
continue;
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(e820_any_mapped);
/*
* This function checks if the entire range <start,end> is mapped with type.
*