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x86: make e820_update_range() handle small range update

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Impact: enhance e820 code to handle more cases

Try to handle new range which could be covered by one entry.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: jbeulich@novell.com
LKML-Reference: <49B9F0C1.10402@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2009-03-12 22:36:01 -07:00 committed by Ingo Molnar
parent 773e673de2
commit 78a8b35bc7
1 changed files with 19 additions and 4 deletions
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23
arch/x86/kernel/e820.c
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@ -427,6 +427,7 @@ static u64 __init __e820_update_range(struct e820map *e820x, u64 start,
u64 size, unsigned old_type,
unsigned new_type)
{
u64 end;
unsigned int i;
u64 real_updated_size = 0;
@ -435,21 +436,35 @@ static u64 __init __e820_update_range(struct e820map *e820x, u64 start,
if (size > (ULLONG_MAX - start))
size = ULLONG_MAX - start;
end = start + size;
for (i = 0; i < e820x->nr_map; i++) {
struct e820entry *ei = &e820x->map[i];
u64 final_start, final_end;
u64 ei_end;
if (ei->type != old_type)
continue;
/* totally covered? */
if (ei->addr >= start &&
(ei->addr + ei->size) <= (start + size)) {
ei_end = ei->addr + ei->size;
/* totally covered by new range? */
if (ei->addr >= start && ei_end <= end) {
ei->type = new_type;
real_updated_size += ei->size;
continue;
}
/* new range is totally covered? */
if (ei->addr < start && ei_end > end) {
__e820_add_region(e820x, start, size, new_type);
__e820_add_region(e820x, end, ei_end - end, ei->type);
ei->size = start - ei->addr;
real_updated_size += size;
continue;
}
/* partially covered */
final_start = max(start, ei->addr);
final_end = min(start + size, ei->addr + ei->size);
final_end = min(end, ei_end);
if (final_start >= final_end)
continue;