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Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in port
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code |
Date: |
Mon, 27 May 2013 00:42:13 +0300 |
On Sun, May 26, 2013 at 03:49:53PM -0500, Anthony Liguori wrote:
> Paolo Bonzini <address@hidden> writes:
>
> > Il 26/05/2013 22:02, Michael S. Tsirkin ha scritto:
> >> > My fault. I should have looked at linux/types.h (actually asm-generic/).
> >>
> >> Not really, __uX appear in the headers that were posted.
>
> Which is a problem because this is a reserved namespace in C99.
>
> >> What I'm saying is - a chance of a conflict is very remote,
> >> if it happens it's a build failure so easy to debug.
> >
> > I'm sure that others will complain, :) but you can go ahead.
>
> I think we should clean up the virtio headers in the kernel first.
> Seems like a good thing to do given the standardization effort too.
> There are lots of headers in uapi that use the C99 int types
I found 4:
$ grep -l uint include/uapi/linux/*h
include/uapi/linux/dm-log-userspace.h
include/uapi/linux/fuse.h
include/uapi/linux/jffs2.h
include/uapi/linux/pps.h
include/uapi/linux/rds.h
include/uapi/linux/sctp.h
That's not really lots.
> so there
> doesn't seem to be a reason they couldn't be used in virtio. fuse.h
> even has a:
>
> #ifdef __KERNEL__
> #include <linux/types.h>
> #else
> #include <stdint.h>
> #endif
>
> Which seems like a reasonable thing to do.
In kernel, we really want to use things like endian-ness
checks (and, we really should have them in userspace too!).
So we want __le32 and other kernel goodies
like that. stdint.h won't cut it.
> The only other kernel dependency is linux/if_ether.h to define
> ETH_ALEN. But it seems completely reasonable to define a
> VIRTIO_NET_MAC_ALEN or something like that.
Ugh. Not really reasonable IMO. We also use ETH_P_IP in code,
would like to get rid of redefining that too.
But we can have our own linux/if_ether.h for non-linux hosts,
just with a
couple of macros like that, it's not a big deal.
> This would make the virtio headers completely stand alone and includable
> in userspace (without violating C99).
>
> Perhaps it's even worth moving the headers from uapi/linux to
> uapi/virtio. Rusty, what do you think?
>
> Regards,
>
> Anhtony Liguori
>
> >
> > Paolo
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, (continued)
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Peter Maydell, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Michael S. Tsirkin, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Peter Maydell, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Michael S. Tsirkin, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Paolo Bonzini, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Michael S. Tsirkin, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Paolo Bonzini, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Michael S. Tsirkin, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Paolo Bonzini, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Anthony Liguori, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Anthony Liguori, 2013/05/26
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Michael S. Tsirkin, 2013/05/27
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Anthony Liguori, 2013/05/27
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Michael S. Tsirkin, 2013/05/28
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Rusty Russell, 2013/05/29
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Anthony Liguori, 2013/05/29
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Michael S. Tsirkin, 2013/05/29
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Anthony Liguori, 2013/05/29
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Rusty Russell, 2013/05/27
- Re: [Qemu-devel] [PATCH v2 00/11] qemu: use virtio linux headers in portable code, Anthony Liguori, 2013/05/27