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authorYinghai Lu <yinghai@kernel.org>2010-02-10 01:20:17 -0800
committerH. Peter Anvin <hpa@zytor.com>2010-02-10 17:47:18 -0800
commit28b1c57d3c1f8df69c958f2ae7b9e4b67538ff4d (patch)
treef4893e9e715a73d32e1f1ed6f27c689cd730e35e /arch/x86/kernel/e820.c
parent264ebb182e85f30aa473fa2189d5d5ea173ec3ab (diff)
x86: Dynamically increase early_res array size
Use early_res_count to track the num, and use find_e820 to get a new buffer, then copy from the old to the new one. Also, clear early_res to prevent later invalid usage. -v2 _check_and_double_early_res should take new start Signed-off-by: Yinghai Lu <yinghai@kernel.org> LKML-Reference: <1265793639-15071-14-git-send-email-yinghai@kernel.org> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/kernel/e820.c')
-rw-r--r--arch/x86/kernel/e820.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 7053f4adb8e..e09c18c8f3c 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -916,6 +916,48 @@ void __init reserve_early_overlap_ok(u64 start, u64 end, char *name)
__reserve_early(start, end, name, 1);
}
+static void __init __check_and_double_early_res(u64 start)
+{
+ u64 end, size, mem;
+ struct early_res *new;
+
+ /* do we have enough slots left ? */
+ if ((max_early_res - early_res_count) > max(max_early_res/8, 2))
+ return;
+
+ /* double it */
+ end = max_pfn_mapped << PAGE_SHIFT;
+ size = sizeof(struct early_res) * max_early_res * 2;
+ mem = find_e820_area(start, end, size, sizeof(struct early_res));
+
+ if (mem == -1ULL)
+ panic("can not find more space for early_res array");
+
+ new = __va(mem);
+ /* save the first one for own */
+ new[0].start = mem;
+ new[0].end = mem + size;
+ new[0].overlap_ok = 0;
+ /* copy old to new */
+ if (early_res == early_res_x) {
+ memcpy(&new[1], &early_res[0],
+ sizeof(struct early_res) * max_early_res);
+ memset(&new[max_early_res+1], 0,
+ sizeof(struct early_res) * (max_early_res - 1));
+ early_res_count++;
+ } else {
+ memcpy(&new[1], &early_res[1],
+ sizeof(struct early_res) * (max_early_res - 1));
+ memset(&new[max_early_res], 0,
+ sizeof(struct early_res) * max_early_res);
+ }
+ memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
+ early_res = new;
+ max_early_res *= 2;
+ printk(KERN_DEBUG "early_res array is doubled to %d at [%llx - %llx]\n",
+ max_early_res, mem, mem + size - 1);
+}
+
/*
* Most early reservations come here.
*
@@ -929,6 +971,8 @@ void __init reserve_early(u64 start, u64 end, char *name)
if (start >= end)
return;
+ __check_and_double_early_res(end);
+
drop_overlaps_that_are_ok(start, end);
__reserve_early(start, end, name, 0);
}
@@ -957,6 +1001,10 @@ void __init early_res_to_bootmem(u64 start, u64 end)
for (i = 0; i < max_early_res && early_res[i].end; i++)
count++;
+ /* need to skip first one ?*/
+ if (early_res != early_res_x)
+ idx = 1;
+
printk(KERN_INFO "(%d/%d early reservations) ==> bootmem [%010llx - %010llx]\n",
count - idx, max_early_res, start, end);
for (i = idx; i < count; i++) {
@@ -974,6 +1022,11 @@ void __init early_res_to_bootmem(u64 start, u64 end)
reserve_bootmem_generic(final_start, final_end - final_start,
BOOTMEM_DEFAULT);
}
+ /* clear them */
+ memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res);
+ early_res = NULL;
+ max_early_res = 0;
+ early_res_count = 0;
}
/* Check for already reserved areas */