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authorMagnus Damm <magnus@valinux.co.jp>2005-11-05 17:25:54 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-14 19:55:17 -0800
commitffd10a2b77bca50dd05ba26acd5a6e68bcc8f61f (patch)
tree92bd5c702cde0c6582950ff66f648e59bf5fb2cd
parente583538f077d5f70191670b47a046ba436ec3428 (diff)
downloadop-kernel-dev-ffd10a2b77bca50dd05ba26acd5a6e68bcc8f61f.zip
op-kernel-dev-ffd10a2b77bca50dd05ba26acd5a6e68bcc8f61f.tar.gz
[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 <magnus@valinux.co.jp> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/x86_64/mm/k8topology.c1
-rw-r--r--arch/x86_64/mm/numa.c2
-rw-r--r--arch/x86_64/mm/srat.c4
3 files changed, 1 insertions, 6 deletions
diff --git a/arch/x86_64/mm/k8topology.c b/arch/x86_64/mm/k8topology.c
index 65417b0..a5663e0b 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 edd5559..629ff06 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<<PAGE_SHIFT) - nodes[i].start;
nodes[i].end = nodes[i].start + sz;
- if (i != numa_fake-1)
- nodes[i].end--;
printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n",
i,
nodes[i].start, nodes[i].end,
diff --git a/arch/x86_64/mm/srat.c b/arch/x86_64/mm/srat.c
index c7aa08a..33340bd 100644
--- a/arch/x86_64/mm/srat.c
+++ b/arch/x86_64/mm/srat.c
@@ -71,8 +71,6 @@ static __init void cutoff_node(int i, unsigned long start, unsigned long end)
nd->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);
}
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