linux-kernel - Re: acpi_cpu_freq

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Date:	Mon, 5 May 2008 23:47:41 -0700
From:	Greg KH <gregkh@...e.de>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Len Brown <lenb@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-acpi <linux-acpi@...r.kernel.org>
Subject: Re: acpi_cpu_freq_init warning...

On Tue, May 06, 2008 at 03:29:55PM +0900, OGAWA Hirofumi wrote:
> > calling  acpi_cpufreq_init+0x0/0x68()
> > sysdev: class cpu: driver (ffffffff80da0110) has already been
> > registered to a class, something is wrong, but will forge on!
> > ------------[ cut here ]------------
> > WARNING: at drivers/base/sys.c:183 sysdev_driver_register+0x82/0x150()
> > Modules linked in:
> > Pid: 1, comm: swapper Not tainted
> > 2.6.26-rc1-sched-devel.git-x86-latest.git-00485-g253148c-dirty #333
> 
> I've seen this too. The following patch seems to work for me.
> -- 
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
> 
> 
> [PATCH] Fix bogus warning in sysdev_driver_register()
> 
> 	if ((drv->entry.next != drv->entry.prev) ||
> 	    (drv->entry.next != NULL)) {
> 
> warns list_empty(&drv->entry).

should we just call list_empty() here to make sure it is correct?

thanks,

greg k-h
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