linux-kernel - Out of tree module build errors since v4.20-rc1

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Date:   Wed, 21 Nov 2018 15:56:34 -0500
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Nadav Amit <namit@...are.com>, linux-kernel@...r.kernel.org
Subject: Out of tree module build errors since v4.20-rc1


My out of tree driver build is now reporting issues with the jump table:

./include/linux/jump_label.h: In function ‘jump_entry_code’:
./include/linux/jump_label.h:153:14: error: dereferencing pointer to incomplete type ‘const struct jump_entry’
  return entry->code;
              ^~
./include/linux/jump_label.h: In function ‘jump_entry_set_init’:
./include/linux/jump_label.h:180:7: error: dereferencing pointer to incomplete type ‘struct jump_entry’
  entry->key |= 2;
       ^~
./include/linux/jump_label.h: At top level:
./include/linux/jump_label.h:212:26: error: array type has incomplete element type ‘struct jump_entry’
 extern struct jump_entry __start___jump_table[];
                          ^~~~~~~~~~~~~~~~~~~~
./include/linux/jump_label.h:213:26: error: array type has incomplete element type ‘struct jump_entry’
 extern struct jump_entry __stop___jump_table[];
                          ^~~~~~~~~~~~~~~~~~~


This happens in v4.20-rc3 as well, so I bisected between v4.19 to
v4.20-rc1 which resulted in the following commit:

b34006c4258c9c86597b6b7123d6a9a3513d6cd7 is the first bad commit
commit b34006c4258c9c86597b6b7123d6a9a3513d6cd7
Author: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Date:   Tue Sep 18 23:51:41 2018 -0700

    x86/jump_table: Use relative references




Initially I assumed this was my own fault, but my module does not have
these issues when using v4.19.  Is there anything I should try/change in
my module makefile, includes, etc to support this relative reference
code?



Thank you,
Liam