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

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Date:   Wed, 14 Dec 2016 08:24:11 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Artem Bityutskiy <dedekind1@...il.com>,
        linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
        Richard Weinberger <richard@....at>
Subject: Re: linux-next: build warning after merge of the tip tree


* Stephen Rothwell <sfr@...b.auug.org.au> wrote:

> Hi all,
> 
> After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> produced this warning:
> 
> fs/ubifs/dir.c: In function 'ubifs_readdir':
> fs/ubifs/dir.c:629:13: warning: 'fstr_real_len' may be used uninitialized in this function [-Wmaybe-uninitialized]
>     fstr.len = fstr_real_len;
>              ^
> 
> Introduced by commit
> 
>   f4f61d2cc6d8 ("ubifs: Implement encrypted filenames")
> 
> This is a false positive because assignment and use are both protected by
> "if (encrypted)".
> 
> I have no idea why this did not turn up earlier in my builds.

FYI, f4f61d2cc6d8 is not in the -tip tree, so it cannot possibly have introduced 
this warning.

Thanks,

	Ingo