Re: linux-next: Tree for Feb 8 [ smp|cpufreq: WARNING: atkernel/smp.c:245 smp_call_function_single ]

[Sedat Dilek]

On Fri, Feb 8, 2013 at 12:53 PM, Hillf Danton <dhillf@xxxxxxxxx> wrote:
> Hello Sedat
>
> On Fri, Feb 8, 2013 at 4:46 PM, Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote:
>> On Fri, Feb 8, 2013 at 5:31 AM, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
>> With today's Linux-Next I see this warning:
>>
>> [    0.377442] ------------[ cut here ]------------
>> [    0.377452] WARNING: at kernel/smp.c:245
>> smp_call_function_single+0x146/0x190()
>> [    0.377455] Hardware name: 530U3BI/530U4BI/530U4BH
>> [    0.377458] Modules linked in:
>> [    0.377463] Pid: 1, comm: swapper/0 Not tainted
>> 3.8.0-rc6-next20130208-1-iniza-small #1
>> [    0.377467] Call Trace:
>> [    0.377473]  [<ffffffff8105a5ef>] warn_slowpath_common+0x7f/0xc0
>> [    0.377479]  [<ffffffff81579130>] ? acpi_cpufreq_target+0x2c0/0x2c0
>> [    0.377483]  [<ffffffff8105a64a>] warn_slowpath_null+0x1a/0x20
>> [    0.377487]  [<ffffffff810bb7e6>] smp_call_function_single+0x146/0x190
>> [    0.377492]  [<ffffffff81579130>] ? acpi_cpufreq_target+0x2c0/0x2c0
>> [    0.377496]  [<ffffffff810bb881>] smp_call_function_any+0x51/0x100
>> [    0.377500]  [<ffffffff815788c9>] get_cur_val+0x99/0x130
>> [    0.377504]  [<ffffffff81579444>] ? acpi_cpufreq_cpu_init+0x2b4/0x6a0
>> [    0.377508]  [<ffffffff81578db0>] get_cur_freq_on_cpu+0x60/0x80
>> [    0.377512]  [<ffffffff815795a2>] acpi_cpufreq_cpu_init+0x412/0x6a0
>> [    0.377517]  [<ffffffff81575bb9>] cpufreq_add_dev+0x2d9/0x4f0
>> [    0.377523]  [<ffffffff81d44b22>] ? cpufreq_gov_dbs_init+0x2c/0x2c
>> [    0.377528]  [<ffffffff8145d379>] subsys_interface_register+0x89/0xd0
>> [    0.377533]  [<ffffffff81573dee>] cpufreq_register_driver+0x8e/0x180
>> [    0.377537]  [<ffffffff81d44c18>] acpi_cpufreq_init+0xf6/0x1f8
>> [    0.377542]  [<ffffffff814608e6>] ? platform_driver_register+0x46/0x50
>> [    0.377547]  [<ffffffff8100206f>] do_one_initcall+0x3f/0x170
>> [    0.377553]  [<ffffffff81d07029>] kernel_init_freeable+0x13e/0x1cd
>> [    0.377560]  [<ffffffff81d06895>] ? do_early_param+0x86/0x86
>> [    0.377565]  [<ffffffff8169cf20>] ? rest_init+0x80/0x80
>> [    0.377569]  [<ffffffff8169cf2e>] kernel_init+0xe/0xf0
>> [    0.377575]  [<ffffffff816c722c>] ret_from_fork+0x7c/0xb0
>> [    0.377578]  [<ffffffff8169cf20>] ? rest_init+0x80/0x80
>> [    0.377581] ---[ end trace c6ec8280ce20313a ]---
>>
>> kernel/smp.c: Line #245 see [1].
>>
> Can you please try the following?
>
> --- a/kernel/smp.c      Fri Feb  8 19:25:32 2013
> +++ b/kernel/smp.c      Fri Feb  8 19:53:14 2013
> @@ -241,7 +241,7 @@ int smp_call_function_single(int cpu, sm
>          * send smp call function interrupt to this cpu and as such deadlocks
>          * can't happen.
>          */
> -       WARN_ON_ONCE(cpu_online(this_cpu) && (irqs_disabled() || in_interrupt())
> +       WARN_ON_ONCE(cpu_online(this_cpu) && irqs_disabled()
>                      && !oops_in_progress);
>
>         if (cpu == this_cpu) {
> --

NO, it doesn't.

So, you want to partly revert...

commit b29f39c7c3e75a741a7da88244ec707f293ec04c
"smp: Give WARN()ing if in_interrupt() when calling
smp_call_function_many()/single()"

...why not completely?

This patch was in last days Linux-Next and did not cause troubles (AFAICS).

- Sedat -

[1] http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=commitdiff;h=b29f39c7c3e75a741a7da88244ec707f293ec04c
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