linux-kernel - Re: [PATCH] vhost-scsi: Depend on NET for memcpy

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Message-ID: <20130516021636.GA24175@hj.localdomain>
Date:	Thu, 16 May 2013 10:16:36 +0800
From:	Asias He <asias@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	"Michael S. Tsirkin" <mst@...hat.com>, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	target-devel@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Randy Dunlap <rdunlap@...radead.org>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] vhost-scsi: Depend on NET for memcpy_fromiovec

On Thu, May 16, 2013 at 09:05:38AM +0930, Rusty Russell wrote:
> "Nicholas A. Bellinger" <nab@...ux-iscsi.org> writes:
> > On Wed, 2013-05-15 at 14:47 +0930, Rusty Russell wrote:
> >> Asias He <asias@...hat.com> writes:
> >> > scsi.c includes vhost.c which uses memcpy_fromiovec.
> >> >
> >> > This patch fixes this build failure.
> >> >
> >> >    From Randy Dunlap:
> >> >    '''
> >> >    on x86_64:
> >> >
> >> >    ERROR: "memcpy_fromiovec" [drivers/vhost/vhost_scsi.ko] undefined!
> >> >
> >> >    It needs to depend on NET since net/core/ provides that function.
> >> >    '''
> >> 
> >> Proper fix please.
> >> 
> >> Though I can't see why you thought this was a good idea.  Nonetheless, I
> >> shan't highlight why: I have far too much respect for your intellects
> >> and abilities.
> >> 
> >> No, don't thank me!
> >
> > Hi Rusty & Asias,
> >
> > I assume you mean something like the following patch to allow kbuild to
> > work when VHOST_NET + VHOST_SCSI are both enabled and sharing vhost.o,
> > yes..?
> 
> No, that's a separate issue.
> 
> memcpy_fromiovec() has nothing to do with networking: that was just the
> first user.  Note that crypto/algif_skcipher.c also uses it.  The
> obvious answer is to move it into lib/.

That's true. I also want this.

> OTOH making vhost_scsi depend on CONFIG_NET is breathtakingly lazy.  I
> expect better from experienced kernel hackers :(

But do you think moving the memcpy_fromiovec stuff is a 3.10 material?

> Rusty.

-- 
Asias
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