ext4: fix race between sync and completed io work

[linux-2.6-block.git] / mm / memblock.c

diff --git a/mm/memblock.c b/mm/memblock.c
index 2f55f19b7c86517bb5b23680c1b062f7efe2795a..77b5f227e1d86d9228ae6a67f52f18418a2beb98 100644 (file)
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -106,14 +106,17 @@ phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
        if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
                end = memblock.current_limit;
 
-       /* adjust @start to avoid underflow and allocating the first page */
-       start = max3(start, size, (phys_addr_t)PAGE_SIZE);
+       /* avoid allocating the first page */
+       start = max_t(phys_addr_t, start, PAGE_SIZE);
        end = max(start, end);
 
        for_each_free_mem_range_reverse(i, nid, &this_start, &this_end, NULL) {
                this_start = clamp(this_start, start, end);
                this_end = clamp(this_end, start, end);
 
+               if (this_end < size)
+                       continue;
+
                cand = round_down(this_end - size, align);
                if (cand >= this_start)
                        return cand;