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SubjectRe: error: implicit declaration of function 'zero_bytemask'
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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@ezchip.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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