Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch

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Subject: Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch
From: Andrew Morton (akpm_AT_osdl.org)
Date: Tue Jul 13 2004 - 12:44:23 EEST

Takashi Iwai <tiwai_AT_suse.de> wrote:
>
> > You can do unlock_kernel()/lock_kernel() in soundcore_open().
>
> I remember ioctl() is also in lock_kernel()?

yes, you'll need to do unlock_kernel/lock_kernel there too. If someone
changes the rules, or otherwise calls your ioctl withoht lock_kernel() held
it will reliably go BUG with spinlock debugging enabled, so make sure you
test with CONFIG_DEBUG_SPINLOCK=y.

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