linux-kernel - Re: [PATCH reset-next 2/2] reset: brcmstb: Fix 32-bit build with 64-bit resource_size

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Date:   Wed, 23 Jan 2019 10:39:26 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Brian Norris <computersforpeace@...il.com>,
        Gregory Fong <gregory.0xf0@...il.com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>, rdunlap@...radead.org,
        linux-next@...r.kernel.org, sfr@...b.auug.org.au,
        paul.gortmaker@...driver.com
Subject: Re: [PATCH reset-next 2/2] reset: brcmstb: Fix 32-bit build with
 64-bit resource_size_t

Hi Florian,

On Tue, 2019-01-22 at 16:33 -0800, Florian Fainelli wrote:
> On 32-bit architectures defining resource_size_t as 64-bit (because of
> PAE), we can run into a linker failure because of the modulo and the
> division against resource_size(), replace the two problematic operations
> with an alignment check on the register resource (instead of modulo),
> and the division with DIV_ROUND_CLOSEST_ULL().
> 
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Fixes: c196cdc7659d ("reset: Add Broadcom STB SW_INIT reset controller driver")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/reset/reset-brcmstb.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/reset/reset-brcmstb.c b/drivers/reset/reset-brcmstb.c
> index 01ab1f71518b..c4cab8b5052d 100644
> --- a/drivers/reset/reset-brcmstb.c
> +++ b/drivers/reset/reset-brcmstb.c
> @@ -91,7 +91,8 @@ static int brcmstb_reset_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	if (resource_size(res) % SW_INIT_BANK_SIZE) {
> +	if (!IS_ALIGNED(res->start, SW_INIT_BANK_SIZE) ||
> +	    !IS_AGLINED(resource_size(res), SW_INIT_BANK_SIZE)) {

Typo.

>  		dev_err(kdev, "incorrect register range\n");
>  		return -EINVAL;
>  	}
> @@ -103,7 +104,8 @@ static int brcmstb_reset_probe(struct platform_device *pdev)
>  	dev_set_drvdata(kdev, priv);
>  
>  	priv->rcdev.owner = THIS_MODULE;
> -	priv->rcdev.nr_resets = (resource_size(res) / SW_INIT_BANK_SIZE) * 32;
> +	priv->rcdev.nr_resets = DIV_ROUND_CLOSEST_ULL(resource_size(res),
> +						      SW_INIT_BANK_SIZE) * 32;

This should be DIV_ROUND_DOWN_ULL.

regards
Philipp