linux-kernel - Re: next-0519 on thinkpad x60: sound related? window manager crash

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Message-ID: <20200609114059.GA1228@lst.de>
Date:   Tue, 9 Jun 2020 13:40:59 +0200
From:   Christoph Hellwig <hch@....de>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     Christoph Hellwig <hch@....de>,
        David Rientjes <rientjes@...gle.com>,
        "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>,
        alsa-devel@...a-project.org, bp@...en8.de, hch@...radead.org,
        hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...hat.com,
        Pavel Machek <pavel@....cz>, perex@...ex.cz,
        tglx@...utronix.de, tiwai@...e.com, x86@...nel.org
Subject: Re: next-0519 on thinkpad x60: sound related? window manager crash

On Tue, Jun 09, 2020 at 01:38:46PM +0200, Takashi Iwai wrote:
> On Tue, 09 Jun 2020 13:31:23 +0200,
> Christoph Hellwig wrote:
> > 
> > On Tue, Jun 09, 2020 at 11:31:20AM +0200, Takashi Iwai wrote:
> > > > > How would be a proper way to get the virtually mapped SG-buffer pages
> > > > > with coherent memory?  (Also allowing user-space mmap, too)
> > > > 
> > > > dma_mmap_coherent / dma_mmap_attrs for userspace.  We don't really
> > > > have a good way for kernel space mappings.
> > > 
> > > And that's the missing piece right now...  :-<
> > 
> > Can you point me to the relevant places (allocation and vmap mostly)
> > so that I can take a look at how to fix this mess?
> 
> Found in sound/core/sgbuf.c.  It's specific to x86.

So it looks like we could just turn off CONFIG_SND_DMA_SGBUF and
be done with it?  After all this works on other architectures
just fine..