linux-kernel - Re: linux-next: build warning after merge of the drivers-x86 tree

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Date:   Wed, 14 Dec 2016 14:21:38 -0800
From:   Darren Hart <dvhart@...radead.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lyude <lyude@...hat.com>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: linux-next: build warning after merge of the drivers-x86 tree

On Wed, Dec 14, 2016 at 01:50:44PM +1100, Stephen Rothwell wrote:
> Hi Darren,
> 
> After merging the drivers-x86 tree, today's linux-next build (x86_64
> allmodconfig) produced this warning:
> 
> In file included from include/linux/kernel.h:13:0,
>                  from drivers/platform/x86/thinkpad_acpi.c:52:
> drivers/platform/x86/thinkpad_acpi.c: In function 'hotkey_init':
> include/linux/printk.h:299:2: warning: 'type' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
>   ^
> drivers/platform/x86/thinkpad_acpi.c:3147:8: note: 'type' was declared here
>   char *type;
>         ^
> In file included from include/linux/kernel.h:13:0,
>                  from drivers/platform/x86/thinkpad_acpi.c:52:
> include/linux/printk.h:299:2: warning: 'in_tablet_mode' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
>   ^
> drivers/platform/x86/thinkpad_acpi.c:3146:6: note: 'in_tablet_mode' was declared here
>   int in_tablet_mode, res;
>       ^
> 
> Introduced by commit
> 
>   b31800283868 ("platform/x86: thinkpad_acpi: Move tablet detection into separate function")
> 
> I can't tell if this is a false positive or not.

That's an uninitialized local variable. Not sure how I missed that. I'll
fix it up today. Thank you for the report.

-- 
Darren Hart
Intel Open Source Technology Center