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Date: Sat, 19 Jan 2008 16:15:22 +0100 From: Ingo Molnar <mingo@...e.hu> To: travis@....com Cc: Andrew Morton <akpm@...ux-foundation.org>, Andi Kleen <ak@...e.de>, Christoph Lameter <clameter@....com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 4/5] x86: Add config variables for SMP_MAX * Ingo Molnar <mingo@...e.hu> wrote: > > NR_CPUS: max limit now 4096 > > NODES_SHIFT: max limit now 9 > > THREAD_ORDER: max limit now 3 > > X86_SMP_MAX: say Y to enable possible cpus == NR_CPUS > > > > Signed-off-by: Mike Travis <travis@....com> > > i've bisected a boot failure down to this patch (sans the THREAD_ORDER > bits): it causes an instant reboot of the 64-bit kernel upon bootup. > Failing config attached. and then it crashes with: [ 0.000000] Bootmem setup node 0 0000000000000000-000000003fff0000 [ 0.000000] KERN_NOTICE cpu_to_node(0): usage too early! PANIC: early exception 06 rip 10:ffffffff81f77f30 error 0 cr2 f06f53 [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.24-rc8 #422 [ 0.000000] [ 0.000000] Call Trace: [ 0.000000] [<ffffffff81f76b4a>] ? setup_node_bootmem+0x1a0/0x1b8 [ 0.000000] [<ffffffff81f77f30>] ? acpi_scan_nodes+0x204/0x255 [ 0.000000] [<ffffffff81f77f30>] ? acpi_scan_nodes+0x204/0x255 [ 0.000000] [<ffffffff81f77103>] ? numa_initmem_init+0x343/0x471 moral: PLEASE do not use BUG() on in early init code, unless absolutely necessary. Ingo --- include/asm-x86/topology.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) Index: linux/include/asm-x86/topology.h =================================================================== --- linux.orig/include/asm-x86/topology.h +++ linux/include/asm-x86/topology.h @@ -70,10 +70,11 @@ static inline int cpu_to_node(int cpu) if(x86_cpu_to_node_map_early_ptr) { printk("KERN_NOTICE cpu_to_node(%d): usage too early!\n", (int)cpu); - BUG(); + dump_stack(); + return 0; } #endif - if(per_cpu_offset(cpu)) + if (per_cpu_offset(cpu)) return per_cpu(x86_cpu_to_node_map, cpu); else return NUMA_NO_NODE; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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