From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 25 Jul 2007 19:30:52 +0100 Subject: [PATCH] Allow nodes to exist that only contain ZONE_MOVABLE Message-ID: <20070725183052.GB1750@skynet.ie> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline From: mel@skynet.ie (Mel Gorman) Sender: owner-linux-mm@kvack.org Return-Path: To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, apw@shadowen.org List-ID: 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 fails. 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 --- page_alloc.c | 6 +++--- 1 file 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)) { -- Mel Gorman Part-time Phd Student Linux Technology Center University of Limerick IBM Dublin Software Lab -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org