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Date:   Fri, 8 Oct 2021 14:37:12 +0200
From:   Arnd Bergmann <>
Cc:     Arnd Bergmann <>,
        Michael Forney <>,
        ALSA Development Mailing List <>,
        Takashi Iwai <>,
        Baolin Wang <>,
        y2038 Mailman List <>,
        Linux Kernel Mailing List <>,
        Mark Brown <>,
        Baolin Wang <>
Subject: Re: [musl] Re: [alsa-devel] [PATCH v7 8/9] ALSA: add new 32-bit
 layout for snd_pcm_mmap_status/control

On Fri, Oct 8, 2021 at 2:06 PM Rich Felker <> wrote:
> On Fri, Oct 08, 2021 at 11:24:39AM +0200, Arnd Bergmann wrote:
> >
> > I've tried to understand this part of musl's convert_ioctl_struct(), but I just
> > can't figure out whether it does the conversion based the on the layout that
> > is currently used in the kernel, or based on the layout we should have been
> > using, and would use with the above fix. Rich, can you help me here?
> If the attempted 64-bit ioctl is missing (ENOTTY), it does the
> conversion to the legacy 32-bit one and retries with that, then
> converts the results back to the 64-bit form.

I understand that it tries to do that.

The part that I'm not sure about is which of the two possible
64-bit forms it's using -- the broken one we have defined in the
kernel headers, or the one we were trying to define but failed.


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