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

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Date:	Wed, 07 Oct 2015 14:53:18 +0200
From:	Michal Sojka <sojkam1@....cvut.cz>
To:	Chris Metcalf <cmetcalf@...hip.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: error: implicit declaration of function 'zero_bytemask'

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.

Best regards,
-Michal



Download attachment ".config" of type "application/octet-stream" (31882 bytes)