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

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Date:   Wed, 21 Nov 2018 16:14:47 -0500
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Nadav Amit <namit@...are.com>
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Out of tree module build errors since v4.20-rc1

* Nadav Amit <namit@...are.com> [181121 16:12]:
> > On Nov 21, 2018, at 12:56 PM, Liam R. Howlett <Liam.Howlett@...cle.com> wrote:
> > 
> > 
> > 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?
> 
> Do you see HAVE_ARCH_JUMP_LABEL_RELATIVE set in your kernel config?
> 

Yes:
 $ grep HAVE_ARCH_JUMP_LABEL_RELATIVE .config
 CONFIG_HAVE_ARCH_JUMP_LABEL_RELATIVE=y


I should have mentioned I ran 'make defoldconfig' between each bisect.