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| author | Yinghai Lu <yinghai@kernel.org> | 2010-12-16 19:09:58 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-12-23 13:16:18 -0800 |
| commit | d3bd058826aa8b79590cca6c8e6d1557bf576ada (patch) | |
| tree | de8d614d11ddf2d8c337740e00c64d5e6707ead6 /arch/x86/mm | |
| parent | 56d91f132c9be66e98cce1b1e77a28027048bb26 (diff) | |
| download | linux-d3bd058826aa8b79590cca6c8e6d1557bf576ada.tar.gz linux-d3bd058826aa8b79590cca6c8e6d1557bf576ada.tar.bz2 linux-d3bd058826aa8b79590cca6c8e6d1557bf576ada.zip | |
x86, acpi: Parse all SRAT cpu entries even above the cpu number limitation
Recent Intel new system have different order in MADT, aka will list all thread0
at first, then all thread1.
But SRAT table still old order, it will list cpus in one socket all together.
If the user have compiled limited NR_CPUS or boot with nr_cpus=, could have missed
to put some cpus apic id to node mapping into apicid_to_node[].
for example for 4 sockets system with 64 cpus with nr_cpus=32 will get crash...
[ 9.106288] Total of 32 processors activated (136190.88 BogoMIPS).
[ 9.235021] divide error: 0000 [#1] SMP
[ 9.235315] last sysfs file:
[ 9.235481] CPU 1
[ 9.235592] Modules linked in:
[ 9.245398]
[ 9.245478] Pid: 2, comm: kthreadd Not tainted 2.6.37-rc1-tip-yh-01782-ge92ef79-dirty #274 /Sun Fire x4800
[ 9.265415] RIP: 0010:[<ffffffff81075a8f>] [<ffffffff81075a8f>] select_task_rq_fair+0x4f0/0x623
...
[ 9.645938] RIP [<ffffffff81075a8f>] select_task_rq_fair+0x4f0/0x623
[ 9.665356] RSP <ffff88103f8d1c40>
[ 9.665568] ---[ end trace 2296156d35fdfc87 ]---
So let just parse all cpu entries in SRAT.
Also add apicid checking with MAX_LOCAL_APIC, in case We could out of boundaries of
apicid_to_node[].
it fixes following bug too.
https://bugzilla.kernel.org/show_bug.cgi?id=22662
-v2: expand to 32bit according to hpa
need to add MAX_LOCAL_APIC for 32bit
Reported-and-Tested-by: Wu Fengguang <fengguang.wu@intel.com>
Reported-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Tested-by: Myron Stowe <myron.stowe@hp.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <4D0AD486.9020704@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/srat_32.c | 1 | ||||
| -rw-r--r-- | arch/x86/mm/srat_64.c | 10 |
2 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/mm/srat_32.c b/arch/x86/mm/srat_32.c index a17dffd136c1..f16434568a51 100644 --- a/arch/x86/mm/srat_32.c +++ b/arch/x86/mm/srat_32.c @@ -92,6 +92,7 @@ acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *cpu_affinity) /* mark this node as "seen" in node bitmap */ BMAP_SET(pxm_bitmap, cpu_affinity->proximity_domain_lo); + /* don't need to check apic_id here, because it is always 8 bits */ apicid_to_pxm[cpu_affinity->apic_id] = cpu_affinity->proximity_domain_lo; printk(KERN_DEBUG "CPU %02x in proximity domain %02x\n", diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c index a35cb9d8b060..171a0aacb99a 100644 --- a/arch/x86/mm/srat_64.c +++ b/arch/x86/mm/srat_64.c @@ -134,6 +134,10 @@ acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa) } apic_id = pa->apic_id; + if (apic_id >= MAX_LOCAL_APIC) { + printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%04x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node); + return; + } apicid_to_node[apic_id] = node; node_set(node, cpu_nodes_parsed); acpi_numa = 1; @@ -168,6 +172,12 @@ acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa) apic_id = (pa->apic_id << 8) | pa->local_sapic_eid; else apic_id = pa->apic_id; + + if (apic_id >= MAX_LOCAL_APIC) { + printk(KERN_INFO "SRAT: PXM %u -> APIC 0x%02x -> Node %u skipped apicid that is too big\n", pxm, apic_id, node); + return; + } + apicid_to_node[apic_id] = node; node_set(node, cpu_nodes_parsed); acpi_numa = 1; |