linux-kernel - Re: [PATCH 2/2] modpost: skip ELF local symbols by default during section mismatch check

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Message-ID: <alpine.DEB.2.21.9999.1811141126450.22477@viisi.sifive.com>
Date:   Wed, 14 Nov 2018 11:30:45 -0800 (PST)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
cc:     paul.walmsley@...ive.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>, jimw@...ive.com,
        Michal Marek <michal.lkml@...kovi.net>,
        Paul Walmsley <paul@...an.com>
Subject: Re: [PATCH 2/2] modpost: skip ELF local symbols by default during
 section mismatch check

Hello Masahiro,

On Tue, 13 Nov 2018, Masahiro Yamada wrote:

> Hi Paul,
>
> On Sat, Oct 20, 2018 at 10:21 PM Paul Walmsley <paul.walmsley@...ive.com> wrote:
>>
>> During development of a serial console driver with a RISC-V toolchain,
>> the following modpost warning appeared:
>>
>> ----
>> WARNING: vmlinux.o(.data+0x19b10): Section mismatch in reference from the variable .LANCHOR1 to the function .init.text:sifive_serial_console_setup()
>> The variable .LANCHOR1 references
>> the function __init sifive_serial_console_setup()
>> If the reference is valid then annotate the
>> variable with __init* or __refdata (see linux/init.h) or name the variable:
>> *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console
>> ----
>
> Could you provide me a little more information to reproduce it?
>
> I tried your dev/paulw/serial-v4.19-rc7,
> but I could not get that warning.
>
> I used risc64-linux-gcc (GCC 7.3, 8.1) from kernel.org

I observed this issue with gcc 8.2:

riscv64-unknown-linux-gnu-gcc (crosstool-NG 1.23.0.534-710c8) 8.2.0

This toolchain was built with mainline crosstool-NG:

https://github.com/crosstool-ng/crosstool-ng

using the "riscv64-unknown-linux-gnu" sample configuration.


- Paul