linux-kernel - Re: error: implicit declaration of function 'zero

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Message-ID: <56151E38.5030006@ezchip.com>
Date:	Wed, 7 Oct 2015 09:29:28 -0400
From:	Chris Metcalf <cmetcalf@...hip.com>
To:	Michal Sojka <sojkam1@....cvut.cz>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: error: implicit declaration of function 'zero_bytemask'

On 10/07/2015 08:53 AM, Michal Sojka wrote:
> Dear Chris,
>
> the following commit breaks my Linux build.
>
>      commit 990486c8af044f89bddfbde1d1cf9fde449bedbf
>      Author: Chris Metcalf <cmetcalf@...hip.com>
>      Date:   Tue Oct 6 12:37:41 2015 -0400
>       
>          strscpy: zero any trailing garbage bytes in the destination
>          
>          It's possible that the destination can be shadowed in userspace
>          (as, for example, the perf buffers are now).  So we should take
>          care not to leak data that could be inspected by userspace.
>
> The error message is:
>
>      lib/string.c: In function 'strscpy':
>      lib/string.c:209:4: error: implicit declaration of function 'zero_bytemask' [-Werror=implicit-function-declaration]
>      cc1: some warnings being treated as errors
>
> I compile the kernel for PowerPC (32 bit) with the attached config.

Ah, it appears that big-endian powerpc does not provide
zero_bytemask(), only little-endian.  I'll fix this in v3 of
the patch series - thanks!

-- 
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com

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