Re: [PATCH -next] MIPS: Netlogic: Fix build error

From: Guenter Roeck
Date: Tue Aug 25 2015 - 13:14:24 EST

On 08/25/2015 09:29 AM, Guenter Roeck wrote:
dma_alloc_from_coherent is defined as (0) if HAVE_GENERIC_DMA_COHERENT
is not configured. This results in the following build error, seen
with nlm_xlp_defconfig.

arch/mips/netlogic/common/nlm-dma.c: In function 'nlm_dma_alloc_coherent':
arch/mips/netlogic/common/nlm-dma.c:50:8: error: unused variable 'ret'

Add __maybe_unused to the variable declaration to fix the problem.

Fixes: 79f8511c83f1 ("MIPS: Netlogic: SWIOTLB dma ops for 32-bit DMA")

Upon reflection, I think the problem may have been introduced by changes
in the definition of dma_alloc_from_coherent(), not by the above patch.
Not sure how to fix that properly.


Cc: Jayachandran C <jchandra@xxxxxxxxxxxx>
Cc: Ganesan Ramalingam <ganesanr@xxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
arch/mips/netlogic/common/nlm-dma.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/netlogic/common/nlm-dma.c b/arch/mips/netlogic/common/nlm-dma.c
index f3d4ae87abc7..4982d97d279f 100644
--- a/arch/mips/netlogic/common/nlm-dma.c
+++ b/arch/mips/netlogic/common/nlm-dma.c
@@ -47,7 +47,7 @@ static char *nlm_swiotlb;
static void *nlm_dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, struct dma_attrs *attrs)
- void *ret;
+ void __maybe_unused *ret;

if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
return ret;

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