linux-kernel - Re: current->sched_class->yield

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Message-ID: <CAP=VYLp61h_i+RyuUfowO9CqjV6ohMZ=FSgqQbxv6WQjXR1_6g@mail.gmail.com>
Date:	Sat, 19 Apr 2014 12:21:28 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Lin Ming <minggr@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: current->sched_class->yield_task is NULL, any hint?

On Wed, Apr 9, 2014 at 5:39 PM, Lin Ming <minggr@...il.com> wrote:
> On Wed, Apr 9, 2014 at 1:08 PM, Peter Zijlstra <peterz@...radead.org> wrote:

[...]

>>>
>>> Look at that, its calling yield() from a non-preemptible context as
>>> well.
>>>
>>> That code is full of fail.
>>
>> *phew* none of that br_igmp_* muck lives in any kernel tree near me so I
>> can stop worrying :-)
>
> It's our internal code.

In the future, please don't simply call it 3.4-rt when there are a bunch of
vendor/project/SDK patches also applied, as that can be very misleading
to the people you are asking for help from.  If it is a hybrid franken-kernel
then please at least indicate that right at the very beginning.

Paul.
--

>
>>
>> In any case, it wrongly passes a GFP_WAIT along to netlink_broadcast.
>
> I'll fix it.
> Thanks very much.
> --
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