linux-kernel - Re: [PATCH 2/2] sunbmac: Fix compiler warning

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Message-Id: <20161118.142949.2261138244816252418.davem@davemloft.net>
Date:   Fri, 18 Nov 2016 14:29:49 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     tushar.n.dave@...cle.com
Cc:     sparclinux@...r.kernel.org, chris.hyser@...cle.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] sunbmac: Fix compiler warning

From: Tushar Dave <tushar.n.dave@...cle.com>
Date: Mon, 17 Oct 2016 13:57:00 -0700

> sunbmac uses '__u32' for dma handle while invoking kernel DMA APIs,
> instead of using dma_addr_t. This hasn't caused any 'incompatible
> pointer type' warning on SPARC because until now dma_addr_t is of
> type u32. However, recent changes in SPARC ATU (iommu) enables 64bit
> DMA and therefore dma_addr_t becomes of type u64. This makes
> 'incompatible pointer type' warnings inevitable.
> 
> e.g.
> drivers/net/ethernet/sun/sunbmac.c: In function ‘bigmac_ether_init’:
> drivers/net/ethernet/sun/sunbmac.c:1166: warning: passing argument 3 of ‘dma_alloc_coherent’ from incompatible pointer type
> ./include/linux/dma-mapping.h:445: note: expected ‘dma_addr_t *’ but argument is of type ‘__u32 *’
> 
> This patch resolves above compiler warning.
> 
> Signed-off-by: Tushar Dave <tushar.n.dave@...cle.com>
> Reviewed-by: chris hyser <chris.hyser@...cle.com>

Applied.