linux-kernel - Re: [PATCH] xenbus: avoid stack overflow warning

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Date:   Wed, 6 May 2020 07:12:24 +0200
From:   Jürgen Groß <jgross@...e.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Yan Yankovskyi <yyankovskyi@...il.com>, Wei Liu <wl@....org>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] xenbus: avoid stack overflow warning

On 05.05.20 22:57, Arnd Bergmann wrote:
> On Tue, May 5, 2020 at 6:02 PM Jürgen Groß <jgross@...e.com> wrote:
>> On 05.05.20 17:01, Arnd Bergmann wrote:
>>> On Tue, May 5, 2020 at 4:34 PM Jürgen Groß <jgross@...e.com> wrote:
>>>> On 05.05.20 16:15, Arnd Bergmann wrote:
>>>
>>> I considered that as well, and don't really mind either way. I think it does
>>> get a bit ugly whatever we do. If you prefer the union, I can respin the
>>> patch that way.
>>
>> Hmm, thinking more about it I think the real clean solution would be to
>> extend struct map_ring_valloc_hvm to cover the pv case, too, to add the
>> map and unmap arrays (possibly as a union) to it and to allocate it
>> dynamically instead of having it on the stack.
>>
>> Would you be fine doing this?
> 
> This is a little more complex than I'd want to do without doing any testing
> (and no, I don't want to do the testing either) ;-)
> 
> It does sound like a better approach though.

I take this as you are fine with me writing the patch and adding you as
"Reported-by:"?


Juergen