linux-kernel - Re: [PATCH] dmaengine: ti: k3-udma: fix -Wenum-conversion warning

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Date:   Tue, 27 Oct 2020 09:02:18 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Arnd Bergmann <arnd@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Grygorii Strashko <grygorii.strashko@...com>
CC:     Arnd Bergmann <arnd@...db.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Yu Kuai <yukuai3@...wei.com>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dmaengine: ti: k3-udma: fix -Wenum-conversion warning



On 26/10/2020 18.01, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> gcc warns about a mismatch argument type when passing
> 'false' into a function that expects an enum:

Strange enough, but my gcc does not warn me (Gentoo 10.2.0-r2 p3).

> drivers/dma/ti/k3-udma-private.c: In function 'xudma_tchan_get':
> drivers/dma/ti/k3-udma-private.c:86:34: warning: implicit conversion from 'enum <anonymous>' to 'enum udma_tp_level' [-Wenum-conversion]
>   86 |  return __udma_reserve_##res(ud, false, id);   \
>      |                                  ^~~~~
> drivers/dma/ti/k3-udma-private.c:95:1: note: in expansion of macro 'XUDMA_GET_PUT_RESOURCE'
>    95 | XUDMA_GET_PUT_RESOURCE(tchan);
>       | ^~~~~~~~~~~~~~~~~~~~~~

But this is valid. The Throughput Levels got expanded with j721e from 2
to three and I failed to update this.

> In this case, false has the same numerical value as
> UDMA_TP_NORMAL, so passing that is most likely the correct
> way to avoid the warning without changing the behavior.

Yes, that's correct, thanks for fixing it!

Acked-by: Peter Ujfalusi <peter.ujfalusi@...com>

> Fixes: d70241913413 ("dmaengine: ti: k3-udma: Add glue layer for non DMAengine users")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/dma/ti/k3-udma-private.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/ti/k3-udma-private.c b/drivers/dma/ti/k3-udma-private.c
> index aa24e554f7b4..8563a392f30b 100644
> --- a/drivers/dma/ti/k3-udma-private.c
> +++ b/drivers/dma/ti/k3-udma-private.c
> @@ -83,7 +83,7 @@ EXPORT_SYMBOL(xudma_rflow_is_gp);
>  #define XUDMA_GET_PUT_RESOURCE(res)					\
>  struct udma_##res *xudma_##res##_get(struct udma_dev *ud, int id)	\
>  {									\
> -	return __udma_reserve_##res(ud, false, id);			\
> +	return __udma_reserve_##res(ud, UDMA_TP_NORMAL, id);		\
>  }									\
>  EXPORT_SYMBOL(xudma_##res##_get);					\
>  									\
> 

- Péter

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