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

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Date:	Thu, 16 May 2013 09:05:38 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	Asias He <asias@...hat.com>, "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

"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/.

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

Rusty.
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