linux-kernel - Re: [x86/mm/pat, drivers/media/ivtv] WARNING: CPU: 0 PID: 1 at drivers/media/pci/ivtv/ivtvfb.c:1270 ivtvfb

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Date:	Sat, 20 Jun 2015 13:08:44 +0200
From:	Borislav Petkov <bp@...e.de>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Ingo Molnar <mingo@...nel.org>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, LKP <lkp@...org>
Subject: Re: [x86/mm/pat, drivers/media/ivtv]  WARNING: CPU: 0 PID: 1 at
 drivers/media/pci/ivtv/ivtvfb.c:1270 ivtvfb_init()

On Sat, Jun 20, 2015 at 03:17:56PM +0800, Fengguang Wu wrote:
> Greetings,
> 
> 0day kernel testing robot got the below dmesg and the first bad commit is
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> 
> commit 1bf1735b478008c30acaff18ec6f4a3ff211c28a
> Author:     Luis R. Rodriguez <mcgrof@...e.com>
> AuthorDate: Mon Jun 15 10:28:16 2015 +0200
> Commit:     Ingo Molnar <mingo@...nel.org>
> CommitDate: Thu Jun 18 11:23:41 2015 +0200
> 
>     x86/mm/pat, drivers/media/ivtv: Use arch_phys_wc_add() and require PAT disabled

...

> [   12.956506] ivtv: Start initialization, version 1.4.3
> [   12.958238] ivtv: End initialization
> [   12.959438] ------------[ cut here ]------------
> [   12.974076] WARNING: CPU: 0 PID: 1 at drivers/media/pci/ivtv/ivtvfb.c:1270 ivtvfb_init+0x32/0xa3()
> [   12.978017] ivtvfb needs PAT disabled, boot with nopat kernel parameter

Warning says it all. You need to boot with "nopat". Apparently, those
devices are very seldom now and users should boot with "nopat".

Luis, what is the plan, is this driver supposed to be converted to
reserve_memtype(..., _PAGE_CACHE_MODE_WC, ...) at some point?

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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