Messages in this thread Patch in this message | | | Date | Tue, 17 May 2016 16:56:48 +0200 | From | Jiri Olsa <> | Subject | [RFC][WARNING] warning in uncore_pci_probe |
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hi, I'm hitting following warning:
[ 2.766466] WARNING: CPU: 0 PID: 1 at arch/x86/events/intel/uncore.c:894 uncore_pci_probe+0x2a8/0x2b0 [ 2.776749] Modules linked in: [ 2.780166] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.6.0tip+ #7 [ 2.787060] Hardware name: Dell Inc. PowerEdge R520/08DM12, BIOS 2.1.2 01/20/2014 [ 2.795409] 0000000000000286 00000000893ec9e0 ffff880624607bb0 ffffffff8134913c [ 2.803698] 0000000000000000 0000000000000000 ffff880624607bf0 ffffffff8108c761 [ 2.811988] 0000037effffffff ffffffff81802d20 0000000000000000 ffff88062436e000 [ 2.820275] Call Trace: [ 2.823006] [<ffffffff8134913c>] dump_stack+0x63/0x87 [ 2.828730] [<ffffffff8108c761>] __warn+0xd1/0xf0 [ 2.834074] [<ffffffff8108c89d>] warn_slowpath_null+0x1d/0x20 [ 2.840581] [<ffffffff81015208>] uncore_pci_probe+0x2a8/0x2b0 [ 2.847093] [<ffffffff8138af25>] local_pci_probe+0x45/0xa0 [ 2.853310] [<ffffffff8135e749>] ? find_next_bit+0x19/0x20 [ 2.859525] [<ffffffff8138c3a6>] pci_device_probe+0x136/0x140 [ 2.866034] [<ffffffff81478be9>] driver_probe_device+0x239/0x460 [ 2.872831] [<ffffffff81478ed9>] __driver_attach+0xc9/0xf0 [ 2.879046] [<ffffffff81478e10>] ? driver_probe_device+0x460/0x460 [ 2.886038] [<ffffffff8147676c>] bus_for_each_dev+0x6c/0xc0 [ 2.892350] [<ffffffff8147845e>] driver_attach+0x1e/0x20 [ 2.898373] [<ffffffff81477ed0>] bus_add_driver+0x1d0/0x290 [ 2.904686] [<ffffffff81d85785>] ? uncore_cpu_setup+0x17/0x17 [ 2.911195] [<ffffffff81479980>] driver_register+0x60/0xe0 [ 2.917412] [<ffffffff8138a85c>] __pci_register_driver+0x4c/0x50 [ 2.924210] [<ffffffff81d859fc>] intel_uncore_init+0x277/0x2dd [ 2.930813] [<ffffffff81d85785>] ? uncore_cpu_setup+0x17/0x17 [ 2.937322] [<ffffffff8100213d>] do_one_initcall+0xcd/0x1f0 [ 2.943636] [<ffffffff810ab933>] ? parse_args+0x293/0x480 [ 2.949755] [<ffffffff81d80360>] kernel_init_freeable+0x1a5/0x249 [ 2.956650] [<ffffffff81d7fa35>] ? set_debug_rodata+0x12/0x12 [ 2.963161] [<ffffffff816b5f0e>] kernel_init+0xe/0x110 [ 2.968991] [<ffffffff816c2c3f>] ret_from_fork+0x1f/0x40 [ 2.975012] [<ffffffff816b5f00>] ? rest_init+0x80/0x80
I'm booting with nr_cpus=1, which impact physical_to_logical_pkg setup.. the map will not be initialized because the rest of cpus is never initialized and set in cpu_present_mask
it seems to me we should remove the warning, because it's valid to have only single cpu allowed
thanks, jirka
--- diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c index 7012d18bb293..f921a1ed43f7 100644 --- a/arch/x86/events/intel/uncore.c +++ b/arch/x86/events/intel/uncore.c @@ -888,7 +888,7 @@ static int uncore_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id return -ENODEV; pkg = topology_phys_to_logical_pkg(phys_id); - if (WARN_ON_ONCE(pkg < 0)) + if (pkg < 0) return -EINVAL; if (UNCORE_PCI_DEV_TYPE(id->driver_data) == UNCORE_EXTRA_PCI_DEV) {
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