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x86: fix warning in e820_reserve_resources with 32bit

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when 64bit resource is not enabled, we get:

arch/x86/kernel/e820.c: In function ‘e820_reserve_resources’:
arch/x86/kernel/e820.c:1217: warning: comparison is always false due to limited range of data type

because res->start/end is resource_t aka u32. it will overflow.

fix it with temp end of u64

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-06-28 17:49:59 -07:00 committed by Ingo Molnar
parent 7482b0e962
commit b4df32f4ae
1 changed files with 6 additions and 3 deletions
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9
arch/x86/kernel/e820.c
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@ -1202,6 +1202,7 @@ void __init e820_reserve_resources(void)
{
int i;
struct resource *res;
u64 end;
res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
for (i = 0; i < e820.nr_map; i++) {
@ -1211,14 +1212,16 @@ void __init e820_reserve_resources(void)
case E820_NVS: res->name = "ACPI Non-volatile Storage"; break;
default: res->name = "reserved";
}
res->start = e820.map[i].addr;
res->end = res->start + e820.map[i].size - 1;
end = e820.map[i].addr + e820.map[i].size - 1;
#ifndef CONFIG_RESOURCES_64BIT
if (res->end > 0x100000000ULL) {
if (end > 0x100000000ULL) {
res++;
continue;
}
#endif
res->start = e820.map[i].addr;
res->end = end;
res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
insert_resource(&iomem_resource, res);
res++;