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Message-ID: <479286CA.3080705@sgi.com> Date: Sat, 19 Jan 2008 15:24:58 -0800 From: Mike Travis <travis@....com> To: Ingo Molnar <mingo@...e.hu> 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 wrote: > * Ingo Molnar <mingo@...e.hu> wrote: > >> 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. > > the right fix is below. > > Ingo > > --- > include/asm-x86/topology.h | 4 ++-- > 1 file changed, 2 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 +70,10 @@ 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(); > } > #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/ Except the function needs to return a valid node id if it's to continue: --- linux.orig/include/asm-x86/topology.h 2008-01-19 15:23:04.996551867 -0800 +++ linux/include/asm-x86/topology.h 2008-01-19 15:23:05.208564537 -0800 @@ -67,10 +67,11 @@ static inline int early_cpu_to_node(int static inline int cpu_to_node(int cpu) { #ifdef CONFIG_DEBUG_PER_CPU_MAPS - if(x86_cpu_to_node_map_early_ptr) { + if (x86_cpu_to_node_map_early_ptr) { printk("KERN_NOTICE cpu_to_node(%d): usage too early!\n", (int)cpu); dump_stack(); + return ((numanode_t *)x86_cpu_to_node_map_early_ptr)[cpu]; } #endif if (per_cpu_offset(cpu)) ?? Thannks, Mike -- 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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