linux-kernel - Re: [Xen-devel] [PATCH 09/10] xen/swiotlb: Fix compile warnings when using plain integer instead of NULL pointer.

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Date:	Thu, 13 Sep 2012 16:53:49 +0100
From:	Ian Jackson <Ian.Jackson@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xensource.com>,
	<stefano.stabellini@...citrix.com>
Subject: Re: [Xen-devel] [PATCH 09/10] xen/swiotlb: Fix compile warnings when
	using plain integer instead of NULL pointer.

Konrad Rzeszutek Wilk writes ("[Xen-devel] [PATCH 09/10] xen/swiotlb: Fix compile warnings when using plain integer instead of NULL pointer."):
> arch/x86/xen/pci-swiotlb-xen.c:96:1: warning: Using plain integer as NULL pointer
> arch/x86/xen/pci-swiotlb-xen.c:96:1: warning: Using plain integer as NULL pointer

This warning is simply wrong for this code:

>  IOMMU_INIT_FINISH(pci_xen_swiotlb_detect,
> -		  0,
> +		  NULL,

There is (according to the C language specifications) nothing wrong
with writing 0 for a null pointer.

Nor does CODING_STYLE say that it is forbidden to just write 0.

Ian.
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