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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Augusto Mecking Caringi <augustocaringi@gmail.com>
Cc: torvalds@linux-foundation.org, Kevin Hilman <khilman@kernel.org>,
        Ulf Hansson <ulf.hansson@linaro.org>, Len Brown <len.brown@intel.com>,
        Pavel Machek <pavel@ucw.cz>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] PM / domains: Fix 'may be used uninitialized' build warning
Date: Fri, 06 Jan 2017 02:28:42 +0100
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On Friday, December 30, 2016 11:34:08 AM Augusto Mecking Caringi wrote:
> This patch fixes the following gcc warning:
> 
> drivers/base/power/domain.c: In function ‘genpd_runtime_resume’:
> drivers/base/power/domain.c:642:14: warning: ‘time_start’ may be used
> uninitialized in this function [-Wmaybe-uninitialized]
>    elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)
> 
> The same problem (in another function in this same file) was fixed in
> commit d33d5a6c88fc (avoid spurious "may be used uninitialized" warning)
> 
> Signed-off-by: Augusto Mecking Caringi <augustocaringi@gmail.com>
> ---
>  drivers/base/power/domain.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index a5e1262..2997026 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -626,6 +626,7 @@ static int genpd_runtime_resume(struct device *dev)
>  
>   out:
>  	/* Measure resume latency. */
> +	time_start = 0;
>  	if (timed && runtime_pm)
>  		time_start = ktime_get();

Applied.

Thanks,
Rafael