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Subject[PATCH] x86: max_low_pfn_mapped fix #3
Date

try to merge the range with same page size in init_memory_mapping

so when GBpages is not there, we could do 2M pages at same time.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

---
arch/x86/mm/init_64.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
Index: linux-2.6/arch/x86/mm/init_64.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init_64.c
+++ linux-2.6/arch/x86/mm/init_64.c
@@ -763,6 +763,20 @@ unsigned long __init_refok init_memory_m
end_pfn = end>>PAGE_SHIFT;
nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0);

+ /* try to merge same page size and continuous */
+ for (i = 0; nr_range > 1 && i < nr_range - 1; i++) {
+ unsigned long old_start;
+ if (mr[i].end != mr[i+1].start ||
+ mr[i].page_size_mask != mr[i+1].page_size_mask)
+ continue;
+ /* move it */
+ old_start = mr[i].start;
+ memmove(&mr[i], &mr[i+1],
+ (nr_range - 1 - i) * sizeof (struct map_range));
+ mr[i].start = old_start;
+ nr_range--;
+ }
+
for (i = 0; i < nr_range; i++)
printk(KERN_DEBUG " %010lx - %010lx page %s\n",
mr[i].start, mr[i].end,

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