linux-kernel - Re: [PATCH] ARM: OMAP: Fix use of possibly uninitialized irq variable

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Message-ID: <YKNfgRWM9MK1MY9O@atomide.com>
Date:   Tue, 18 May 2021 09:32:33 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Maciej Falkowski <maciej.falkowski9@...il.com>
Cc:     khilman@...nel.org, aaro.koskinen@....fi, linux@...linux.org.uk,
        linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] ARM: OMAP: Fix use of possibly uninitialized irq variable

* Maciej Falkowski <maciej.falkowski9@...il.com> [210401 19:13]:
> The current control flow of IRQ number assignment to `irq` variable
> allows a request of IRQ of unspecified value,
> generating a warning under Clang compilation with omap1_defconfig on linux-next:
> 
> arch/arm/mach-omap1/pm.c:656:11: warning: variable 'irq' is used uninitialized whenever
> 'if' condition is false [-Wsometimes-uninitialized]
>         else if (cpu_is_omap16xx())
>                  ^~~~~~~~~~~~~~~~~
> ./arch/arm/mach-omap1/include/mach/soc.h:123:30: note: expanded from macro 'cpu_is_omap16xx'
>                                         ^~~~~~~~~~~~~
> arch/arm/mach-omap1/pm.c:658:18: note: uninitialized use occurs here
>         if (request_irq(irq, omap_wakeup_interrupt, 0, "peripheral wakeup",
>                         ^~~
> arch/arm/mach-omap1/pm.c:656:7: note: remove the 'if' if its condition is always true
>         else if (cpu_is_omap16xx())
>              ^~~~~~~~~~~~~~~~~~~~~~
> arch/arm/mach-omap1/pm.c:611:9: note: initialize the variable 'irq' to silence this warning
>         int irq;
>                ^
>                 = 0

Thanks applying into fixes.

Tony