linux-kernel - Re: Problem with VMAP

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Message-ID: <alpine.LNX.2.00.1610070952010.31629@cbobk.fhfr.pm>
Date:   Fri, 7 Oct 2016 09:52:56 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Mauro Carvalho Chehab <mchehab@...pensource.com>
cc:     Jörg Otte <jrg.otte@...il.com>,
        Johannes Stezenbach <js@...uxtv.org>,
        Patrick Boettcher <patrick.boettcher@...teo.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Michael Krufky <mkrufky@...uxtv.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>
Subject: Re: Problem with VMAP_STACK=y

On Thu, 6 Oct 2016, Mauro Carvalho Chehab wrote:

> I can't see any other obvious error on the conversion. You could try to 
> enable debug options at DVB core/dvb-usb and/or add some printk's to the 
> driver and see what's happening.

Mauro, also please don't forget that there are many more places in 
drivers/media that still perform DMA on stack, and so have to be fixed for 
4.9 (as VMAP_STACK makes that to be immediately visible problem even on 
x86_64, which it wasn't the case before).

Thanks,

-- 
Jiri Kosina
SUSE Labs