Subject: [Bug 203609] New: Build error: implicit declaration of function 'cpu_mitigations_off'

From: [email-masked]
Date: Wed, 15 May 2019 13:36:41 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=203609

            Bug ID: 203609
           Summary: Build error: implicit declaration of function
                    'cpu_mitigations_off'
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 4.19.43 and 4.14.119
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-64
          Assignee: [email-masked]
          Reporter: [email-masked]
        Regression: No

Created attachment 282765
  --> https://bugzilla.kernel.org/attachment.cgi?id=282765&action=edit
Build log

This just showed up in 4.19.43 and 4.14.119. 4.19.42 and 4.14.118 were fine.
I'm building with GCC 8.3 for ppc64el. 4.19.43 and 4.14.119 also build fine for
32- and 64-bit x86.

arch/powerpc/kernel/security.c: In function 'setup_barrier_nospec':
arch/powerpc/kernel/security.c:59:21: error: implicit declaration of function
'cpu_mitigations_off' [-Werror=implicit-function-declaration]
  if (!no_nospec && !cpu_mitigations_off())
                     ^~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
scripts/Makefile.build:303: recipe for target 'arch/powerpc/kernel/security.o'
failed
make[1]: *** [arch/powerpc/kernel/security.o] Error 1
Makefile:1051: recipe for target 'arch/powerpc/kernel' failed
make: *** [arch/powerpc/kernel] Error 2

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