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Mike Travis wrote:
> Ingo Molnar wrote:
>> * Mike Travis <travis@sgi.com> wrote:
>>
>>> [Ingo - please replace "PATCH 07/11" with this one.]
>>>
>>> * Remove 544k bytes from the kernel by removing the boot_cpu_pda
>>> array from the data section and allocating it during startup.
>>>
>>> Fixed panic in setup_per_cpu_areas when HOTPLUG_CPU not set.
>>>
>>> For inclusion into sched-devel/latest tree.
>> sched-devel.git randconfig testing found another crash with your queue:
>>
>> [ 0.111060] Brought up 1 CPUs
>> [ 0.111986] Total of 1 processors activated (4022.73 BogoMIPS).
>> [ 0.112987] Testing NMI watchdog ... <1>BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
>> [ 0.114982] IP: [<ffffffff8180d4a0>] check_nmi_watchdog+0xb0/0x210
>> [ 0.114982] PGD 0
>> [ 0.114982] Oops: 0000 [1] SMP
>> [ 0.114982] CPU 0
>> [............]
>>
>> http://redhat.com/~mingo/misc/config-Mon_Apr_28_23_25_25_CEST_2008.bad
>> http://redhat.com/~mingo/misc/log-Mon_Apr_28_23_25_25_CEST_2008.bad
>>
>> Ingo
>
> Hi Ingo,
>
> I need a bit more information on your hardware configuration. Building a
> kernel with the above config file started up fine on both the Intel and AMD
> boxes.
>
> Based on the above output it looks like it might be a UP machine?
...
Ok, I think I found it. In check_nmi_watchdog():
for (cpu = 0; cpu < NR_CPUS; cpu++)
prev_nmi_count[cpu] = cpu_pda(cpu)->__nmi_count;
As I mentioned it works fine on both of my systems so could you try it out?
Thanks!
Mike
--
* Change function check_nmi_watchdog() to use nr_cpu_ids instead of NR_CPUS.
Based on:
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
+ sched-devel/latest .../mingo/linux-2.6-sched-devel.git
Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
7496b60654