Commit:     b5445f956ec3c8c19b760775e9ff92a160e3a167
Parent:     ee2077d97b2f392cfc0b884775ac58aa9b9b8c8f
Author:     Mel Gorman <[EMAIL PROTECTED]>
AuthorDate: Thu Jul 26 10:41:18 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Jul 26 11:35:19 2007 -0700

    Allow nodes to exist that only contain ZONE_MOVABLE
    With the introduction of kernelcore=, a configurable zone is created on
    request.  In some cases, this value will be small enough that some nodes
    contain only ZONE_MOVABLE.  On some NUMA configurations when this occurs,
    arch-independent zone-sizing will get the size of the memory holes within
    the node incorrect.  The value of present_pages goes negative and the boot
    This patch fixes the bug in the calculation of the size of the hole.  The
    test case is to boot test a NUMA machine with a low value of kernelcore=
    before and after the patch is applied.  While this bug exists in early
    kernel it cannot be triggered in practice.
    This patch has been boot-tested on a variety machines with and without
    kernelcore= set.
    Signed-off-by: Mel Gorman <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
 mm/page_alloc.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 40954fb..6d3550c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2775,11 +2775,11 @@ unsigned long __meminit __absent_pages_in_range(int nid,
        if (i == -1)
                return 0;
+       prev_end_pfn = min(early_node_map[i].start_pfn, range_end_pfn);
        /* Account for ranges before physical memory on this node */
        if (early_node_map[i].start_pfn > range_start_pfn)
-               hole_pages = early_node_map[i].start_pfn - range_start_pfn;
-       prev_end_pfn = early_node_map[i].start_pfn;
+               hole_pages = prev_end_pfn - range_start_pfn;
        /* Find all holes for the zone within the node */
        for (; i != -1; i = next_active_region_index_in_nid(i, nid)) {
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