linux-kernel - Re: bugs in _

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Date:	Tue, 26 Jun 2007 13:55:01 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	gshan <gshan@...atel-lucent.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: bugs in __schedule()

Hi Gavin,

On 6/26/07, gshan <gshan@...atel-lucent.com> wrote:
> Here is the all output I have:
>
> # ifconfig mgt0 10.0.51.27
> BUG: scheduling while atomic: exe/0x00000101/752

Yup, you can't sleep in taskets, they're atomic.

> caller is schedule+0x4c/0xe4
> Call trace:
>  [c02dc4dc] __schedule+0x654/0x788
>  [c02dc6f4] schedule+0x4c/0xe4
>  [c02dbe24] __compat_down+0xc8/0x12c

So, you can't use / acquire semaphores in them. Use spinlocks.
If the shared data is also accessed from process context, use
spin_lock_bh() from the process context code.

Satyam
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