early_res: Enhance check_and_double_early_res
... to make it always try to start from low at first.
This makes it less likely for early_memtest to reserve a bad range, in
particular it puts new early_res in a range that is already tested.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1265793639-15071-24-git-send-email-yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/x86/kernel/early_res.c b/arch/x86/kernel/early_res.c
index 1b99a26..dbf08bd 100644
--- a/arch/x86/kernel/early_res.c
+++ b/arch/x86/kernel/early_res.c
@@ -180,9 +180,9 @@
__reserve_early(start, end, name, 1);
}
-static void __init __check_and_double_early_res(u64 start)
+static void __init __check_and_double_early_res(u64 ex_start, u64 ex_end)
{
- u64 end, size, mem;
+ u64 start, end, size, mem;
struct early_res *new;
/* do we have enough slots left ? */
@@ -190,10 +190,23 @@
return;
/* double it */
- end = max_pfn_mapped << PAGE_SHIFT;
+ mem = -1ULL;
size = sizeof(struct early_res) * max_early_res * 2;
- mem = find_e820_area(start, end, size, sizeof(struct early_res));
-
+ if (early_res == early_res_x)
+ start = 0;
+ else
+ start = early_res[0].end;
+ end = ex_start;
+ if (start + size < end)
+ mem = find_e820_area(start, end, size,
+ sizeof(struct early_res));
+ if (mem == -1ULL) {
+ start = ex_end;
+ end = max_pfn_mapped << PAGE_SHIFT;
+ if (start + size < end)
+ mem = find_e820_area(start, end, size,
+ sizeof(struct early_res));
+ }
if (mem == -1ULL)
panic("can not find more space for early_res array");
@@ -235,7 +248,7 @@
if (start >= end)
return;
- __check_and_double_early_res(end);
+ __check_and_double_early_res(start, end);
drop_overlaps_that_are_ok(start, end);
__reserve_early(start, end, name, 0);
@@ -248,7 +261,7 @@
if (start >= end)
return;
- __check_and_double_early_res(end);
+ __check_and_double_early_res(start, end);
r = &early_res[early_res_count];
