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| author |   Yinghai Lu <yhlu.kernel@gmail.com> | 2008-01-30 13:30:39 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:39 +0100 |
| commit | 3f6e5a12b8384ab9816ba6703f4b4be87ac94b5a (patch) | |
| tree | de18e4699de3eb5a0f4480974833deff66f5ad47 | |
| parent | x86: store core id bits in cpuinfo_x8 (diff) | |
| download | linux-dev-3f6e5a12b8384ab9816ba6703f4b4be87ac94b5a.tar.xz linux-dev-3f6e5a12b8384ab9816ba6703f4b4be87ac94b5a.zip | |
x86: use core id bits for apicid_to_node initialization
We shoud use core id bits instead of max cores, in case later with AMD
downcores Quad core Opteron.
[ tglx: arch/x86 adaptation ]
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/mm/k8topology_64.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/arch/x86/mm/k8topology_64.c b/arch/x86/mm/k8topology_64.c index a96006f7ae0c..3695c9e8b9b6 100644 --- a/arch/x86/mm/k8topology_64.c +++ b/arch/x86/mm/k8topology_64.c @@ -44,12 +44,14 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end) { unsigned long prevbase; struct bootnode nodes[8]; - int nodeid, i, j, nb; + int nodeid, i, nb; unsigned char nodeids[8]; int found = 0; u32 reg; unsigned numnodes; - unsigned num_cores; + unsigned cores; + unsigned bits; + int j; if (!early_pci_allowed()) return -1; @@ -60,9 +62,6 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end) printk(KERN_INFO "Scanning NUMA topology in Northbridge %d\n", nb); - num_cores = (cpuid_ecx(0x80000008) & 0xff) + 1; - printk(KERN_INFO "CPU has %d num_cores\n", num_cores); - reg = read_pci_config(0, nb, 0, 0x60); numnodes = ((reg >> 4) & 0xF) + 1; if (numnodes <= 1) @@ -168,11 +167,15 @@ int __init k8_scan_nodes(unsigned long start, unsigned long end) } printk(KERN_INFO "Using node hash shift of %d\n", memnode_shift); + /* use the coreid bits from early_identify_cpu */ + bits = boot_cpu_data.x86_coreid_bits; + cores = (1<<bits); + for (i = 0; i < 8; i++) { if (nodes[i].start != nodes[i].end) { nodeid = nodeids[i]; - for (j = 0; j < num_cores; j++) - apicid_to_node[(nodeid * num_cores) + j] = i; + for (j = 0; j < cores; j++) + apicid_to_node[(nodeid << bits) + j] = i; setup_node_bootmem(i, nodes[i].start, nodes[i].end); } } |