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    SubjectRe: [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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