linux-kernel - Re: [PATCH] rtc: armada38x: hide maybe-uninitialized warning

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Date:   Thu, 12 Jan 2017 12:28:18 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        linux-arm-kernel@...ts.infradead.org, rtc-linux@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: armada38x: hide maybe-uninitialized warning

Hi Arnd,

On 11/01/2017 at 15:50:31 +0100, Arnd Bergmann wrote :
> The function is too complicated for gcc to realize that this variable
> does eventually get initialized, causing a harmless warning:
> 
> drivers/rtc/rtc-armada38x.c: In function 'read_rtc_register_wa':
> drivers/rtc/rtc-armada38x.c:131:25: warning: 'index_max' may be used uninitialized in this function [-Wmaybe-uninitialized]
> 
> This adds an explicit initializion at the start of the function.
> I generally try to avoid that, but it seems appropriate here,
> as we start out with max=0 as well.
> 
> Fixes: 61cffa2438e3 ("rtc: armada38x: Follow the new recommendation for errata implementation")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Actually, I fixed that one directly in the commit yesterday as it has
been reported to me multiple times already.


-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com