[PATCH] arm: dma-mapping: fix build warning with new DMA_ERROR_CODE definition
Russell King - ARM Linux
linux at arm.linux.org.uk
Mon Sep 14 09:31:55 PDT 2015
On Mon, Sep 14, 2015 at 05:13:18PM +0100, Andre Przywara wrote:
> Commit 96231b2686b5: ("ARM: 8419/1: dma-mapping: harmonize definition
> of DMA_ERROR_CODE") changed the definition of DMA_ERROR_CODE to use
> dma_addr_t, which makes the compiler barf on assigning this to an
> "int" variable on ARM with LPAE enabled:
> In file included from /src/linux/include/linux/dma-mapping.h:86:0,
> from /src/linux/arch/arm/mm/dma-mapping.c:21:
> /src/linux/arch/arm/mm/dma-mapping.c: In function '__iommu_create_mapping':
> /src/linux/arch/arm/include/asm/dma-mapping.h:16:24: warning:
> overflow in implicit constant conversion [-Woverflow]
> #define DMA_ERROR_CODE (~(dma_addr_t)0x0)
> /src/linux/arch/arm/mm/dma-mapping.c:1252:15: note: in expansion of
> macro DMA_ERROR_CODE'
> int i, ret = DMA_ERROR_CODE;
It's absolutely right to barf on this. DMA_ERROR_CODE is _supposed_
to be a dma_addr_t cookie. It isn't an int.
> Remove the actually unneeded initialization of "ret" in
> __iommu_create_mapping() and move the variable declaration inside the
> for-loop to make the scope of this variable more clear.
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> arch/arm/mm/dma-mapping.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
> Hi Russell,
> I hope that hasn't turned up before, but this triggers with my config.
> Please apply for 4.3.
The patch looks correct, please put it in the patch system, thanks.
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