Re: error: implicit declaration of function 'zero_bytemask'

[Michal Sojka]

On 7. ÅÃjna 2015 15:29:28 CEST, Chris Metcalf <cmetcalf@xxxxxxxxxx> wrote:
>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@xxxxxxxxxx>
>>      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!

The patch is already in mainline so I guess a fixup patch would be more appropriate.

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