linux-kernel - Re: [PATCH 8/8] virtio_ring.h: do not include <stdint.h> from exported header

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Date:   Tue, 5 Apr 2022 07:59:00 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 8/8] virtio_ring.h: do not include <stdint.h> from
 exported header

On Mon, Apr 04, 2022 at 12:44:30AM -0700, Christoph Hellwig wrote:
> On Mon, Apr 04, 2022 at 03:19:48PM +0900, Masahiro Yamada wrote:
> >  	vr->num = num;
> >  	vr->desc = p;
> >  	vr->avail = (struct vring_avail *)((char *)p + num * sizeof(struct vring_desc));
> > -	vr->used = (void *)(((uintptr_t)&vr->avail->ring[num] + sizeof(__virtio16)
> > +	vr->used = (void *)(((__kernel_uintptr_t)&vr->avail->ring[num] + sizeof(__virtio16)
> >  		+ align-1) & ~(align - 1));
> 
> This really does not look like it should be in a uapi header to start
> with.

It's a way to document a complex structure layout of virtio 0.9. It's
ugly but it's been like this for years. For virtio 1.0 we moved away
from this but a bunch of tools keep using legacy.

-- 
MST