possible incorrect warning in arch/arm/mm/dma-mapping.c

[Ben Dooks <ben.dooks@xxxxxxxxxxxxxxx>]

We see the following when building arm kernel:

arch/arm/mm/dma-mapping.c:738:52: warning: Using plain integer as NULL 
pointer

The function starts with:

static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t 
*handle,
			 gfp_t gfp, pgprot_t prot, bool is_coherent,
			 unsigned long attrs, const void *caller)
{
	u64 mask = get_coherent_dma_mask(dev);
	struct page *page = NULL;
	void *addr;
	bool allowblock, cma;


The line at 738 is:

	cma = allowblock ? dev_get_cma_area(dev) : false;


Which looks fine, dev_get_cma_area() takes a "struct device *" so not
sure where sparse can be finding an integer, as cma and allowblock are
both "bool" types.

--
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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