linux-kernel - Re: Section mismatches in arch/powerpc/kernel/head

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Message-ID: <CAOJe8K2BSY8C6xcLpHszkbZ4dPTWg9Ckn_fubCX+pi8PtJ1oGw@mail.gmail.com>
Date:	Mon, 16 Nov 2015 14:42:36 +0300
From:	Denis Kirjanov <kda@...ux-powerpc.org>
To:	Laura Abbott <labbott@...hat.com>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Scott Wood <scottwood@...escale.com>,
	Tiejun Chen <tiejun.chen@...driver.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Section mismatches in arch/powerpc/kernel/head_64.S

On 11/13/15, Laura Abbott <labbott@...hat.com> wrote:
> Hi,
>
> There seem to be section mismatches coming from head_64.S
>
> WARNING: vmlinux.o(.text+0x8994): Section mismatch in reference from the
> variable __boot_from_prom to the function .init.text:prom_init()
> The function __boot_from_prom() references
> the function __init prom_init().
> This is often because __boot_from_prom lacks a __init
> annotation or the annotation of prom_init is wrong.
>
> WARNING: vmlinux.o(.text+0x8c30): Section mismatch in reference from the
> variable start_here_multiplatform to the function .init.text:early_setup()
> The function start_here_multiplatform() references
> the function __init early_setup().
> This is often because start_here_multiplatform lacks a __init
> annotation or the annotation of early_setup is wrong.
>
> WARNING: vmlinux.o(.text+0x8c54): Section mismatch in reference from the
> variable start_here_common to the function .init.text:setup_system()
> The function start_here_common() references
> the function __init setup_system().
> This is often because start_here_common lacks a __init
> annotation or the annotation of setup_system is wrong.
>
> WARNING: vmlinux.o(.text+0x8c68): Section mismatch in reference from the
> variable start_here_common to the function .init.text:start_kernel()
> The function start_here_common() references
> the function __init start_kernel().
> This is often because start_here_common lacks a __init
> annotation or the annotation of start_kernel is wrong.
>
> FATAL: modpost: Section mismatches detected.
> Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.
> scripts/Makefile.modpost:97: recipe for target 'vmlinux.o' failed
>
> These were noticed when I accidentally turned off
> CONFIG_SECTION_MISMATCH_WARN_ONLY
> (see https://bugzilla.redhat.com/show_bug.cgi?id=1281446) which now
> makes them a compilation failure. Config attached. Currently just working
> around this by keeping that option on.

Looks like something new because I haven't seen these warnings. I'll
check what can be done here...

Thanks!
>
> Thanks,
> Laura
>
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