linux-kernel - Re: [RFC PATCH 4/8 v2] IB/odp/hmm: prepare for HMM code path.

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Date:	Thu, 13 Aug 2015 14:13:35 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Jérôme Glisse <jglisse@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
	Christophe Harle <charle@...dia.com>,
	Duncan Poole <dpoole@...dia.com>,
	Sherry Cheung <SCheung@...dia.com>,
	Subhash Gutti <sgutti@...dia.com>,
	John Hubbard <jhubbard@...dia.com>,
	Mark Hairgrove <mhairgrove@...dia.com>,
	Lucien Dunning <ldunning@...dia.com>,
	Cameron Buschardt <cabuschardt@...dia.com>,
	Arvind Gopalakrishnan <arvindg@...dia.com>,
	Haggai Eran <haggaie@...lanox.com>,
	Shachar Raindel <raindel@...lanox.com>,
	Liran Liss <liranl@...lanox.com>
Subject: Re: [RFC PATCH 4/8 v2] IB/odp/hmm: prepare for HMM code path.

On Thu, Aug 13, 2015 at 03:20:49PM -0400, Jérôme Glisse wrote:
  
> +#if IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM)
> +#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM */

Yuk, what is wrong with

 #if !IS_ENABLED(...)

?

> -#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
> +#if IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING)
> +#if IS_ENABLED(CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM)
> +#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING_HMM */

Double yuk

 #if !(IS_ENABLED(..) && IS_ENABLED(..))

?

And the #ifdefs suck, as many as possible should be normal if
statements, and one should think carefully if we really need to remove
fields from structures..

Jason
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