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

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Date:	Mon, 23 Sep 2013 14:42:50 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next: build warning after merge of the random tree

Hi Ted,

On Mon, 23 Sep 2013 14:39:24 +1000 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> After merging the random tree, today's linux-next build (powerpc64
> allnoconfig) produced this warning:
> 
> In file included from include/linux/kernel.h:10:0,
>                  from include/linux/sched.h:15,
>                  from include/linux/utsname.h:5,
>                  from drivers/char/random.c:238:
> drivers/char/random.c: In function 'add_interrupt_randomness':
> include/linux/bitops.h:96:2: warning: 'input[3]' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   return (word << shift) | (word >> (32 - shift));
>   ^
> drivers/char/random.c:827:10: note: 'input[3]' was declared here
>   __u32   input[4], cycles = random_get_entropy();
>           ^
> In file included from include/linux/kernel.h:10:0,
>                  from include/linux/sched.h:15,
>                  from include/linux/utsname.h:5,
>                  from drivers/char/random.c:238:
> include/linux/bitops.h:96:2: warning: 'input[2]' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   return (word << shift) | (word >> (32 - shift));
>   ^
> drivers/char/random.c:827:10: note: 'input[2]' was declared here
>   __u32   input[4], cycles = random_get_entropy();
>           ^
> 
> Probably introduced by commit d5693ae494f2 ("random: speed up the
> fast_mix function by a factor of four").

i386 defconfig produces similar (to make testing easier).

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

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