Hi,About two weeks ago I sent Richard Henderson the attached email detailing a problem with the 2.6.16 kernel booting on my dual processor Alpha system. Today I was able to track down the problem to the call to topology_cpu_callback() in drivers/base/topology.c--specifically, in that function the call to get_cpu_sysdev() is returning NULL. I have tracked down the reason and created a small patch that solves the problem on my system. Basically for the Alpha architecture, register_cpu is never being called, so get_cpu_sysdev() has nothing to return. Using ppc_init() in arch/ppc/kernel/setup.c, I created a similiar function for the Alpha architecture that just registers the CPU devices. Attached are two versions of the patch: one against 2.6.16.1 and the other against 2.6.17-rc1.
Regards, Brian Uhrain
--- linux-2.6.16.1/arch/alpha/kernel/setup.c.old 2006-04-05 13:01:38.585051580 +0100
+++ linux-2.6.16.1/arch/alpha/kernel/setup.c 2006-04-05 13:02:24.412099456 +0100
@@ -24,6 +24,7 @@
#include <linux/config.h> /* CONFIG_ALPHA_LCA etc */
#include <linux/mc146818rtc.h>
#include <linux/console.h>
+#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/string.h>
@@ -477,6 +478,22 @@
#undef PFN_PHYS
#undef PFN_MAX
+static struct cpu cpu_devices[NR_CPUS];
+
+int __init alpha_init(void)
+{
+ int i;
+
+ /* register CPU devices */
+ for (i = 0; i < NR_CPUS; i++)
+ if (cpu_possible(i))
+ register_cpu(&cpu_devices[i], i, NULL);
+
+ return 0;
+}
+
+arch_initcall(alpha_init);
+
void __init
setup_arch(char **cmdline_p)
{
--- linux-2.6.17-rc1/arch/alpha/kernel/setup.c.old 2006-04-05 12:52:25.636715545 +0100
+++ linux-2.6.17-rc1/arch/alpha/kernel/setup.c 2006-04-05 12:53:01.645504167 +0100
@@ -24,6 +24,7 @@
#include <linux/config.h> /* CONFIG_ALPHA_LCA etc */
#include <linux/mc146818rtc.h>
#include <linux/console.h>
+#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/string.h>
@@ -471,6 +472,21 @@
return 0;
}
+static struct cpu cpu_devices[NR_CPUS];
+
+int __init alpha_init(void)
+{
+ int i;
+
+ /* register CPU devices */
+ for_each_possible_cpu(i)
+ register_cpu(&cpu_devices[i], i, NULL);
+
+ return 0;
+}
+
+arch_initcall(alpha_init);
+
void __init
setup_arch(char **cmdline_p)
{
--- Begin Message ---
- To: [email protected]
- Subject: PROBLEM: Kernel 2.6.16 fails to boot on API CS20
- From: Brian Uhrain <[email protected]>
- Date: Tue, 21 Mar 2006 10:50:40 +0000
- User-agent: Mozilla Thunderbird 1.0.7 (X11/20060302)
Hi,When trying to boot a 2.6.16 kernel (kernel.org sources with the only patch being for Reiser4 FS support), the kernel dies on bootup on my dual-processor Alpha system, with the error "Unable to handle kernel paging request at virtual address 0000000000000058". The system is an API CS20 with 2 833MHz 21264b processors and 1 GB of RAM (8 x 128 MB). I have attached all of the output from the serial console, including the error message, along with a gzipped version of the .config used to compile the kernel and the output of "lspci -vvv". Looking at the kernel output prior to the kernel panic, I noticed it only activated one processor even though it probed two.Here is the output of the ver_linux script: mantheren:/usr/src/linux-2.6.16# sh ./scripts/ver_linux If some fields are empty or look unusual you may have an old version. Compare to the current minimal requirements in Documentation/Changes.Linux mantheren 2.6.15.6-mantheren #1 SMP Tue Mar 7 09:03:30 GMT 2006 alpha unknown unknown GNU/LinuxGnu C 4.1.0 Gnu make 3.80 binutils 2.16.91.0.7 util-linux 2.13-pre7 mount 2.13-pre7 module-init-tools 3.3-pre1 e2fsprogs 1.38 reiserfsprogs 3.6.19 reiser4progs 1.0.5 xfsprogs 2.7.3 Linux C Library 2.3.6 Dynamic linker (ldd) 2.3.6 Procps 3.2.6 Net-tools 1.60 Kbd 83: Sh-utils 5.2.1 udev 087Modules Loaded alim15x3 snd_usb_audio sg snd_pcm snd_timer snd_page_alloc generic snd_usb_lib snd_rawmidi snd_hwdep snd sr_mod cdrom ide_core soundcore e100 mii i2c_ali1535 i2c_ali15x3 zd1211 i2c_dev i2c_coreAnd of /proc/cpuinfo: cpu : Alpha cpu model : EV68AL cpu variation : 7 cpu revision : 0 cpu serial number : system type : Tsunami system variation : Clipper system revision : 0 system serial number : cycle frequency [Hz] : 833333333 timer frequency [Hz] : 1024.00 page size [bytes] : 8192 phys. address bits : 44 max. addr. space # : 255 BogoMIPS : 1657.40 kernel unaligned acc : 963348 (pc=fffffc0000447340,va=fffffc003f8ddff2) user unaligned acc : 0 (pc=0,va=0) platform string : API CS20D 833 MHz cpus detected : 2 cpus active : 2 cpu active mask : 0000000000000003 L1 Icache : 64K, 2-way, 64b line L1 Dcache : 64K, 2-way, 64b line L2 cache : 4096K, 1-way, 64b line L3 cache : n/aIf you need any other information or would like me to test anything, please let me know.Regards, Brian UhrainP.S. The system is running a home-brew "distro" with everything compiled from scratch, and running a 2.6.15.6 kernel it has not given any problems even through recompiles of all of the installed software (glibc through firefox).aboot> 2 aboot: loading compressed vmlinux-custom.gz... aboot: zero-filling 132648 bytes at 0xfffffc0000764710 aboot: starting kernel vmlinux-custom.gz with arguments root=/dev/sda2 console=ttyS0 console=tty0 Linux version 2.6.16-mantheren (root@mantheren) (gcc version 4.1.0) #1 SMP Mon Mar 20 23:11:35 GMT 6 Booting on Tsunami variation Clipper using machine vector Clipper from SRM Major Options: SMP EV67 LEGACY_START VERBOSE_MCHECK MAGIC_SYSRQ Command line: root=/dev/sda2 console=ttyS0 console=tty0 memcluster 0, usage 1, start 0, end 256 memcluster 1, usage 0, start 256, end 130981 memcluster 2, usage 1, start 130981, end 131072 freeing pages 256:384 freeing pages 965:130981 reserving pages 965:967 4096K Bcache detected; load hit latency 18 cycles, load miss latency 164 cycles SMP: 2 CPUs probed -- cpu_present_mask = 1 Built 1 zonelists Kernel command line: root=/dev/sda2 console=ttyS0 console=tty0 PID hash table entries: 4096 (order: 12, 131072 bytes) Using epoch = 2000 Console: colour VGA+ 80x25 Dentry cache hash table entries: 262144 (order: 8, 2097152 bytes) Inode-cache hash table entries: 131072 (order: 7, 1048576 bytes) Memory: 1027944k/1047848k available (3258k kernel code, 17200k reserved, 395k data, 144k init) Mount-cache hash table entries: 512 SMP starting up secondaries. Brought up 1 CPUs SMP: Total of 1 processors activated (1646.17 BogoMIPS). migration_cost=0 NET: Registered protocol family 16 PCI quirk: region 7e20-7e3f claimed by ali7101 SMB Linux Plug and Play Support v0.97 (c) Adam Belay SCSI subsystem initialized usbcore: registered new driver usbfs usbcore: registered new driver hub TC classifier action (bugs to [email protected] cc [email protected]) srm_env: version 0.0.5 loaded successfully Loading Reiser4. See www.namesys.com for a description of Reiser4. SGI XFS with large block/inode numbers, no debug enabled Initializing Cryptographic API io scheduler noop registered io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered (default) Activating ISA DMA hang workarounds. isapnp: Scanning for PnP cards... isapnp: No Plug & Play device found rtc: SRM (post-2000) epoch (2000) detected Real Time Clock Driver v1.12ac Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A Unable to handle kernel paging request at virtual address 0000000000000058 CPU 0 swapper(1): Oops 0 pc = [<fffffc00003cdbb8>] ra = [<fffffc00006ee128>] ps = 0000 Not tainted pc is at sysfs_create_group+0x28/0x160 ra is at topology_cpu_callback+0x68/0xc0 v0 = 0000000000000000 t0 = 0000000000000000 t1 = 0000000000000001 t2 = 0000000000000001 t3 = fffffc003fd73170 t4 = fffffc003fd730c8 t5 = fffffc003fd730c8 t6 = 0000000000000002 t7 = fffffc0000244000 s0 = 0000000000000001 s1 = fffffc0000764828 s2 = fffffc0000722b00 s3 = fffffc000071f048 s4 = fffffc00006f4fb8 s5 = fffffc0000652b00 s6 = fffffc0000652b00 a0 = 0000000000000010 a1 = fffffc000071f048 a2 = 0000000000000000 a3 = 0000000000008080 a4 = 0000000000000004 a5 = 0000000000000000 t8 = 0000000000000001 t9 = fffffc000063c2a0 t10= fffffc00006f70c0 t11= 0000000000000004 pv = fffffc00003cdb90 at = 0000000000000000 gp = fffffc0000762b00 sp = fffffc0000247df8 Trace: [<fffffc00003102b8>] init+0x198/0x5c0 [<fffffc0000311868>] kernel_thread+0x28/0x90 Code: b75e0000 47f1040c b53e0008 b55e0010 b57e0018 e6000043 <a4300048> e4200041 Kernel panic - not syncing: Attempted to kill init!Attachment: config.gz
Description: application/gzipAttachment: pci-devs.txt.gz
Description: application/gzip
--- End Message ---
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