linux-kernel - Re: RTL9300 (mips) fails to boot with commit d4a7f2510ff4 ("vmlinux.lds.h: Adjust symbol ordering in text output section")

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Message-ID: <c6719149-8531-4174-824e-a3caf4bc6d0e@alliedtelesis.co.nz>
Date: Sun, 24 Nov 2024 20:40:09 +0000
From: Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To: Rong Xu <xur@...gle.com>
CC: "Han Yao Yeo (atg)" <hanyao.yeo@...iedtelesis.com.sg>, Thomas Bogendoerfer
	<tsbogend@...ha.franken.de>, Masahiro Gotoh <gotoh@...ied-telesis.co.jp>,
	"linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: RTL9300 (mips) fails to boot with commit d4a7f2510ff4
 ("vmlinux.lds.h: Adjust symbol ordering in text output section")

Hi Rong,

On 22/11/24 18:02, Rong Xu wrote:
> Does the following patch fix your issue?
> https://lore.kernel.org/lkml/CAK7LNAQSpM2hh2=Wgribb92nHF5_peRb+gxdO1Bt1MkeL8N+hw@mail.gmail.com/t/
>
> Masahiro Yamada already applied the patch to kbuild-tree.
>
> I also proposed a similar fix as yours. But we believe the above patch
> should also work (and probably is better).
>
> Please try and let us know.

Looks like linux-next already has that patch and no it doesn't fix my 
issue. For the record here's the start of my System.map

$ head System.map
ffffffff80100000 T __split_text_end
ffffffff80100000 T __split_text_start
ffffffff80100000 T __unlikely_text_start
ffffffff80100000 T _stext
ffffffff80100000 T _text
ffffffff80100000 t run_init_process
ffffffff80100138 t try_to_run_init_process
ffffffff8010018c t put_page
ffffffff801001d0 t nr_blocks.isra.0
ffffffff80100208 T ack_bad_irq

It does look like whatever is supposed to put head.o first isn't kicking 
in for me.

>
> Thanks!
>
> -Rong
>
> On Thu, Nov 21, 2024 at 6:29 PM Chris Packham
> <chris.packham@...iedtelesis.co.nz> wrote:
>>
>> On 22/11/24 14:58, Chris Packham wrote:
>>> Hi Rong,
>>>
>>> I was just trying some of my in-flight changes against linux-next and
>>> found that my RTL9300* based board no longer boots (nothing on the
>>> serial console after U-Boot hands off to the kernel).
>>>
>>> A bisect between Linus's tree and linux-next/master points to commit
>>> d4a7f2510ff4 ("vmlinux.lds.h: Adjust symbol ordering in text output
>>> section"). A build on d4a7f2510ff4^ boots successfully. That series is
>>> well beyond my area of knowledge, there may be something that the MIPS
>>> SoCs are doing (or not doing) that is being affected by the sections
>>> moving.
>> Based on the sparc change that accompanied this commit the following
>> does seem to restore working order for me:
>>
>> diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
>> index d575f945d422..e90b0f68290c 100644
>> --- a/arch/mips/kernel/vmlinux.lds.S
>> +++ b/arch/mips/kernel/vmlinux.lds.S
>> @@ -62,6 +62,8 @@ SECTIONS
>>           _text = .;      /* Text and read-only data */
>>           _stext = .;
>>           .text : {
>> +               /* Match text section symbols in head.S first */
>> +               *head.o(.text)
>>                   TEXT_TEXT
>>                   SCHED_TEXT
>>                   LOCK_TEXT
>>
>> No idea if that's appropriate
>>