x86, memblock: Fix early_node_mem with big reserved region.

Xen can reserve huge amounts of memory for pre-ballooning, but that
still shows as RAM in the e820 memory map.  early_node_mem could not
find range because of start/end adjusting, and will go through the
fallback path.  However, the fallback patch is still using
memblock_x86_find_range_node(), and it is partially top-down because
it go through active_range entries from low to high.

Let's use memblock_find_in_range instead memblock_x86_find_range_node.
So get real top down in fallback path.

We may still need to make memblock_x86_find_range_node to do overall
top_down work.

Reported-by: Jeremy Fitzhardinge <jeremy@goop.org>
Tested-by: Jeremy Fitzhardinge <jeremy@goop.org>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <4CC9A9C9.8020700@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 60f498511dd60b01a9eee62fdc0a69ba80d3082c..7ffc9b727efdc95ee6748acd1a1b646c8e164ffb 100644 (file)
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -178,11 +178,8 @@ static void * __init early_node_mem(int nodeid, unsigned long start,
 
        /* extend the search scope */
        end = max_pfn_mapped << PAGE_SHIFT;
-       if (end > (MAX_DMA32_PFN<<PAGE_SHIFT))
-               start = MAX_DMA32_PFN<<PAGE_SHIFT;
-       else
-               start = MAX_DMA_PFN<<PAGE_SHIFT;
-       mem = memblock_x86_find_in_range_node(nodeid, start, end, size, align);
+       start = MAX_DMA_PFN << PAGE_SHIFT;
+       mem = memblock_find_in_range(start, end, size, align);
        if (mem != MEMBLOCK_ERROR)
                return __va(mem);