linux-kernel - Re: [patch] ARM: qcom: silence an uninitialized variable warning

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Message-Id: <201604140353.03595.arnd@arndb.de>
Date:	Thu, 14 Apr 2016 03:53:03 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Tim Bird <tim.bird@...ymobile.com>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] ARM: qcom: silence an uninitialized variable warning

On Wednesday 13 April 2016, Dan Carpenter wrote:
> It's harmless but, if "enable" isn't set, then we pass uninitialized
> values to qcom_coincell_chgr_config().  The values aren't used, but
> let's silence the warning anyway.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

I haven't seen this warning in my tests, which means it probably doesn't show up
in the usual configurations. Are you sure this doesn't just happen with
CONFIG_PROFILE_ALL_BRANCHES, CONFIG_CC_OPTIMIZE_FOR_SIZE or CONFIG_GCOV_PROFILE_ALL,
or with versions of gcc before 4.9?

	Arnd

> diff --git a/drivers/misc/qcom-coincell.c b/drivers/misc/qcom-coincell.c
> index 7b4a2da..829a61d 100644
> --- a/drivers/misc/qcom-coincell.c
> +++ b/drivers/misc/qcom-coincell.c
> @@ -94,7 +94,8 @@ static int qcom_coincell_probe(struct platform_device *pdev)
>  {
>  	struct device_node *node = pdev->dev.of_node;
>  	struct qcom_coincell chgr;
> -	u32 rset, vset;
> +	u32 rset = 0;
> +	u32 vset = 0;
>  	bool enable;
>  	int rc;
>  
>