linux-kernel - Re: [PATCH 2/2] tools/virtio: virtio

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Message-ID: <20101213165828.GA7182@redhat.com>
Date:	Mon, 13 Dec 2010 18:58:28 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Thiago Farina <tfransosi@...il.com>
Cc:	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] tools/virtio: virtio_test tool

On Mon, Dec 06, 2010 at 02:37:05PM -0200, Thiago Farina wrote:
> On Mon, Nov 29, 2010 at 3:16 PM, Michael S. Tsirkin <mst@...hat.com> wrote:
> > +#define container_of(ptr, type, member) ({                     \
> > +       const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
> > +       (type *)( (char *)__mptr - offsetof(type,member) );})
> > +
> > +#define uninitialized_var(x) x = x
> > +
> > +# ifndef likely
> > +#  define likely(x)    (__builtin_expect(!!(x), 1))
> > +# endif
> > +# ifndef unlikely
> > +#  define unlikely(x)  (__builtin_expect(!!(x), 0))
> > +# endif
> 
> It seems you are not using these macros. Do you really need them here?

They are used by virtio that I'm compiling in userspace here.

> Can't you include the right linux header files for these macros
> instead?

Far from trivial as linux headers aren't intended to
be built in userspace, if you try you get all kind of
conflicts with libc headers etc.

If you see a way to do this, pls send me a patch.

-- 
MST
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