From ffd10a2b77bca50dd05ba26acd5a6e68bcc8f61f Mon Sep 17 00:00:00 2001 From: Magnus Damm Date: Sat, 5 Nov 2005 17:25:54 +0100 Subject: [PATCH] [PATCH] x86_64: Make node boundaries consistent The current x86_64 NUMA memory code is inconsequent when it comes to node memory ranges. The exact behaviour varies depending on which config option that is used. setup_node_bootmem() has start and end as arguments and these are used to calculate the size of the node like this: (end - start). This is all fine if end is pointing to the first non-available byte. The problem is that the current x86_64 code sometimes treats it as the last present byte and sometimes as the first non-available byte. The result is that some configurations might lose a page at the end of the range. This patch tries to fix CONFIG_ACPI_NUMA, CONFIG_K8_NUMA and CONFIG_NUMA_EMU so they all treat the end variable as the first non-available byte. This is the same way as the single node code. The patch is boot tested on dual x86_64 hardware with the above configurations, but maybe the removed code is needed as some workaround? Signed-off-by: Magnus Damm Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- arch/x86_64/mm/k8topology.c | 1 + arch/x86_64/mm/numa.c | 2 -- arch/x86_64/mm/srat.c | 4 ---- 3 files changed, 1 insertion(+), 6 deletions(-) diff --git a/arch/x86_64/mm/k8topology.c b/arch/x86_64/mm/k8topology.c index 65417b040c..a5663e0bb0 100644 --- a/arch/x86_64/mm/k8topology.c +++ b/arch/x86_64/mm/k8topology.c @@ -108,6 +108,7 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end) limit >>= 16; limit <<= 24; limit |= (1<<24)-1; + limit++; if (limit > end_pfn << PAGE_SHIFT) limit = end_pfn << PAGE_SHIFT; diff --git a/arch/x86_64/mm/numa.c b/arch/x86_64/mm/numa.c index edd5559380..629ff0621b 100644 --- a/arch/x86_64/mm/numa.c +++ b/arch/x86_64/mm/numa.c @@ -209,8 +209,6 @@ static int numa_emulation(unsigned long start_pfn, unsigned long end_pfn) if (i == numa_fake-1) sz = (end_pfn<start = nd->end; } if (nd->end > end) { - if (!(end & 0xfff)) - end--; nd->end = end; if (nd->start > nd->end) nd->start = nd->end; @@ -166,8 +164,6 @@ acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma) if (nd->end < end) nd->end = end; } - if (!(nd->end & 0xfff)) - nd->end--; printk(KERN_INFO "SRAT: Node %u PXM %u %Lx-%Lx\n", node, pxm, nd->start, nd->end); } -- 2.39.5