From: Ingo Molnar Date: Wed, 9 May 2012 11:31:47 +0000 (+0200) Subject: x86/numa: Check for nonsensical topologies on real hw as well X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=ad7687dde8780a0d618a3e3b5a62bb383696fc22;p=linux-beck.git x86/numa: Check for nonsensical topologies on real hw as well Instead of only checking nonsensical topologies on numa-emu, do it on real hardware as well, and print a warning. Acked-by: Peter Zijlstra Cc: Tejun Heo Cc: Yinghai Lu Cc: x86@kernel.org Link: http://lkml.kernel.org/n/tip-re15l0jqjtpz709oxozt2zoh@git.kernel.org Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index edfd03a9e390..7c53d96d44ab 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -337,10 +337,10 @@ void __cpuinit set_cpu_sibling_map(int cpu) for_each_cpu(i, cpu_sibling_setup_mask) { struct cpuinfo_x86 *o = &cpu_data(i); -#ifdef CONFIG_NUMA_EMU - if (cpu_to_node(cpu) != cpu_to_node(i)) + if (cpu_to_node(cpu) != cpu_to_node(i)) { + WARN_ONCE(1, "sched: CPU #%d's thread-sibling CPU #%d not on the same node! [node %d != %d]. Ignoring sibling dependency.\n", cpu, i, cpu_to_node(cpu), cpu_to_node(i)); continue; -#endif + } if (cpu_has(c, X86_FEATURE_TOPOEXT)) { if (c->phys_proc_id == o->phys_proc_id && @@ -365,10 +365,10 @@ void __cpuinit set_cpu_sibling_map(int cpu) } for_each_cpu(i, cpu_sibling_setup_mask) { -#ifdef CONFIG_NUMA_EMU - if (cpu_to_node(cpu) != cpu_to_node(i)) + if (cpu_to_node(cpu) != cpu_to_node(i)) { + WARN_ONCE(1, "sched: CPU #%d's core-sibling CPU #%d not on the same node! [node %d != %d]. Ignoring sibling dependency.\n", cpu, i, cpu_to_node(cpu), cpu_to_node(i)); continue; -#endif + } if (per_cpu(cpu_llc_id, cpu) != BAD_APICID && per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) {