linux-kernel - Re: [PATCH 1/4] of: also handle dma-noncoherent in of_dma_is

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Message-ID: <20220620060127.GA10297@lst.de>
Date:   Mon, 20 Jun 2022 08:01:27 +0200
From:   Christoph Hellwig <hch@....de>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     palmer@...belt.com, paul.walmsley@...ive.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        wefu@...hat.com, guoren@...nel.org, cmuellner@...ux.com,
        philipp.tomsich@...ll.eu, hch@....de, samuel@...lland.org,
        atishp@...shpatra.org, anup@...infault.org, mick@....forth.gr,
        robh+dt@...nel.org, krzk+dt@...nel.org, devicetree@...r.kernel.org,
        drew@...gleboard.org, rdunlap@...radead.org
Subject: Re: [PATCH 1/4] of: also handle dma-noncoherent in
 of_dma_is_coherent()

On Sun, Jun 19, 2022 at 10:32:09PM +0200, Heiko Stuebner wrote:
>  bool of_dma_is_coherent(struct device_node *np)
>  {
>  	struct device_node *node;
> +	bool ret = false;

I'd rename this to coherent or is_coherent.

>  
>  	if (IS_ENABLED(CONFIG_OF_DMA_DEFAULT_COHERENT))
> -		return true;
> +		ret = true;

And then do this at initialization time:

	bool is_coherent = IS_ENABLED(CONFIG_OF_DMA_DEFAULT_COHERENT);

but otherwise this looks good to me.