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

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Date:	Tue, 25 Aug 2015 10:14:17 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Ralf Baechle <ralf@...ux-mips.org>
CC:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	Jayachandran C <jchandra@...adcom.com>,
	Ganesan Ramalingam <ganesanr@...adcom.com>
Subject: Re: [PATCH -next] MIPS: Netlogic: Fix build error

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.

Guenter

> Cc: Jayachandran C <jchandra@...adcom.com>
> Cc: Ganesan Ramalingam <ganesanr@...adcom.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>   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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