![]() Fix panic seen on some IBM and HP systems on 2.6.32-rc6: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff8120bf3f>] find_next_bit+0x77/0x9c [...] [<ffffffff8120bbde>] cpumask_next_and+0x2e/0x3b [<ffffffff81225c62>] pci_device_probe+0x8e/0xf5 [<ffffffff812b9be6>] ? driver_sysfs_add+0x47/0x6c [<ffffffff812b9da5>] driver_probe_device+0xd9/0x1f9 [<ffffffff812b9f1d>] __driver_attach+0x58/0x7c [<ffffffff812b9ec5>] ? __driver_attach+0x0/0x7c [<ffffffff812b9298>] bus_for_each_dev+0x54/0x89 [<ffffffff812b9b4f>] driver_attach+0x19/0x1b [<ffffffff812b97ae>] bus_add_driver+0xd3/0x23d [<ffffffff812ba1e7>] driver_register+0x98/0x109 [<ffffffff81225ed0>] __pci_register_driver+0x63/0xd3 [<ffffffff81072776>] ? up_read+0x26/0x2a [<ffffffffa0081000>] ? k8temp_init+0x0/0x20 [k8temp] [<ffffffffa008101e>] k8temp_init+0x1e/0x20 [k8temp] [<ffffffff8100a073>] do_one_initcall+0x6d/0x185 [<ffffffff8108d765>] sys_init_module+0xd3/0x236 [<ffffffff81011ac2>] system_call_fastpath+0x16/0x1b I put in a printk and commented out the set_dev_node() call when and got this output: quirk_amd_nb_node: current numa_node = 0x0, would set to val & 7 = 0x0 quirk_amd_nb_node: current numa_node = 0x0, would set to val & 7 = 0x1 quirk_amd_nb_node: current numa_node = 0x0, would set to val & 7 = 0x2 quirk_amd_nb_node: current numa_node = 0x0, would set to val & 7 = 0x3 I.e. the issue appears to be that the HW has set val to a valid value, however, the system is only configured for a single node -- 0, the others are offline. Check to see if the node is actually online before setting the numa node for an AMD northbridge in quirk_amd_nb_node(). Signed-off-by: Prarit Bhargava <prarit@redhat.com> Cc: bhavna.sarathy@amd.com Cc: jbarnes@virtuousgeek.org Cc: andreas.herrmann3@amd.com LKML-Reference: <20091112180933.12532.98685.sendpatchset@prarit.bos.redhat.com> [ v2: clean up the code and add comments ] Signed-off-by: Ingo Molnar <mingo@elte.hu> |
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.. | ||
boot | ||
configs | ||
crypto | ||
ia32 | ||
include/asm | ||
kernel | ||
kvm | ||
lguest | ||
lib | ||
math-emu | ||
mm | ||
oprofile | ||
pci | ||
power | ||
vdso | ||
video | ||
xen | ||
Kbuild | ||
Kconfig | ||
Kconfig.cpu | ||
Kconfig.debug | ||
Makefile | ||
Makefile_32.cpu |