linux-kernel - Re: [PATCH 1/1] scsi: storvsc: Fix a build issue reported by kbuild test robot

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Date:	Thu, 28 Jan 2016 11:22:23 -0800
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	KY Srinivasan <kys@...rosoft.com>, Olaf Hering <olaf@...fle.de>
Cc:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"hch@...radead.org" <hch@...radead.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"hare@...e.de" <hare@...e.de>
Subject: Re: [PATCH 1/1] scsi: storvsc: Fix a build issue reported by kbuild
 test robot

On Thu, 2016-01-28 at 19:07 +0000, KY Srinivasan wrote:
> 
> > -----Original Message-----
> > From: Olaf Hering [mailto:olaf@...fle.de]
> > Sent: Thursday, January 28, 2016 7:56 AM
> > To: KY Srinivasan <kys@...rosoft.com>
> > Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> > devel@...uxdriverproject.org; ohering@...e.com;
> > jbottomley@...allels.com; hch@...radead.org; 
> > linux-scsi@...r.kernel.org;
> > apw@...onical.com; vkuznets@...hat.com; jasowang@...hat.com;
> > martin.petersen@...cle.com; hare@...e.de
> > Subject: Re: [PATCH 1/1] scsi: storvsc: Fix a build issue reported
> > by kbuild test
> > robot
> > 
> > On Wed, Jan 27, K. Y. Srinivasan wrote:
> > 
> > > +	depends on SCSI_FC_ATTRS
> > 
> > I think 'depends' instead of 'select' will cause HYPERV_STORAGE to
> > disapepar during make oldconfig if SCSI_FC_ATTRS was not set
> > before.
> > Not sure what the policy of 'depends' vs.  'select' actually is. 
> >  If
> > SCSI_FC_ATTRS is supposed to be a library kind of thing then
> > 'select'
> > might be the correct way.
> 
> The current build issue is because the Hyper-V storage is configured
> to be built with
> the kernel while the SCSI_FC_AATRS is configured as a module. This
> patch fixes that issue.
> I too am not sure what the policy of using "depends" vs " select" is.
> James, what would be your recommendation here.

Oh, you don't care if FC_ATTRS are enabled, but if they are you need to
exclude the case where storvsc is built in but FC_ATTRS is a module? 
 This is the accepted way of doing it:

depends on m || SCSI_FC_ATTRS != m

James