From b92e9fac400d4ae5bc7a75c568e9844ec53ea329 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Wed, 2 May 2007 19:27:11 +0200 Subject: [PATCH] x86: fix amd64-agp aperture validation 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 Signed-off-by: Andi Kleen Acked-by: Mark Langsdorf --- arch/i386/kernel/e820.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'arch/i386') diff --git a/arch/i386/kernel/e820.c b/arch/i386/kernel/e820.c index 31f4670ef740..829beec9247e 100644 --- a/arch/i386/kernel/e820.c +++ b/arch/i386/kernel/e820.c @@ -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 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 is mapped with type. * -- cgit v1.2.2