linux-kernel - Re: [PATCH] led-class-flash: fix -Wrestrict warning

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Date:   Mon, 27 Sep 2021 12:31:37 +0200
From:   Pavel Machek <pavel@....cz>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Isaac Hazan <isaac.hazan@...el.com>,
        Lee Jones <lee.jones@...aro.org>,
        Rikard Falkeborn <rikard.falkeborn@...il.com>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH] led-class-flash: fix -Wrestrict warning

Hi!

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/leds/led-class-flash.c | 2 +-
>  drivers/thunderbolt/xdomain.c  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/leds/led-class-flash.c b/drivers/leds/led-class-flash.c
> index 185e17055317..6fe9d700dfef 100644
> --- a/drivers/leds/led-class-flash.c
> +++ b/drivers/leds/led-class-flash.c
> @@ -207,7 +207,7 @@ static ssize_t flash_fault_show(struct device *dev,
>  		mask <<= 1;
>  	}
>  
> -	return sprintf(buf, "%s\n", buf);
> +	return strlen(strcat(buf, "\n"));
>  }
>  static DEVICE_ATTR_RO(flash_fault);
>

That's not just a warning. .. the code is crazy. I'll take it if you
split it from the thunderbolt change.

Best regards,
								Pavel

> diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
> index d66ea4d616fd..eff32499610f 100644
> --- a/drivers/thunderbolt/xdomain.c
> +++ b/drivers/thunderbolt/xdomain.c
> @@ -730,7 +730,7 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
>  
>  	/* Full buffer size except new line and null termination */
>  	get_modalias(svc, buf, PAGE_SIZE - 2);
> -	return sprintf(buf, "%s\n", buf);
> +	return strlen(strcat(buf, "\n"));
>  }
>  static DEVICE_ATTR_RO(modalias);
>  
> -- 
> 2.29.2

-- 
http://www.livejournal.com/~pavelmachek

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