Messages in this thread Patch in this message | | | Date | Thu, 15 May 2003 02:48:34 -0700 | From | William Lee Irwin III <> | Subject | Re: 2.5 kernels fail to start second CPU |
| |
On Thu, May 15, 2003 at 09:57:42AM +0100, David Howells wrote: > I've got a computer here with a pair of Pentium Pro CPUs in it. 2.4 kernels > have no problem starting both CPUs, only later 2.5 kernels (with or without > noapic passed on the kernel cmdline). > Can anyone suggest what might need to be done to fix the problem? > The motherboard sports a fairly standard Intel chipset and there's a Matrox > graphics card plugged in:
Sparse physical APIC ID's are not handled properly. This should correct them.
-- wli
diff -prauN linux-2.5.69-1/arch/i386/kernel/smpboot.c dhowells-2.5.69-1/arch/i386/kernel/smpboot.c --- linux-2.5.69-1/arch/i386/kernel/smpboot.c Mon May 12 11:09:21 2003 +++ dhowells-2.5.69-1/arch/i386/kernel/smpboot.c Thu May 15 02:46:59 2003 @@ -935,7 +935,7 @@ static void __init smp_boot_cpus(unsigned int max_cpus) { - int apicid, cpu, bit; + int apicid, cpu, bit, kicked; /* * Setup boot CPU information @@ -1018,7 +1018,8 @@ */ Dprintk("CPU present map: %lx\n", phys_cpu_present_map); - for (bit = 0; bit < NR_CPUS; bit++) { + kicked = 0; + for (bit = 0; kicked < NR_CPUS && bit < BITS_PER_LONG; bit++) { apicid = cpu_present_to_apicid(bit); /* * Don't even attempt to start the boot CPU! @@ -1034,6 +1035,8 @@ if (do_boot_cpu(apicid)) printk("CPU #%d not responding - cannot use it.\n", apicid); + else + ++kicked; } /* - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |