linux-kernel - Re: [PATCH] clocksource/drivers/exynos_mct: Revert commits causing section mismatches

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Message-ID: <a345528b-1641-4f10-a9ae-6b853f625df4@linaro.org>
Date: Fri, 25 Jul 2025 11:47:39 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Daniel Lezcano <daniel.lezcano@...aro.org>,
 Thomas Gleixner <tglx@...utronix.de>, Krzysztof Kozlowski <krzk@...nel.org>,
 Alim Akhtar <alim.akhtar@...sung.com>,
 Will McVicker <willmcvicker@...gle.com>,
 Youngmin Nam <youngmin.nam@...sung.com>, Donghoon Yu <hoony.yu@...sung.com>,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH] clocksource/drivers/exynos_mct: Revert commits causing
 section mismatches

On 25/07/2025 11:35, Krzysztof Kozlowski wrote:
> On 25/07/2025 11:28, Daniel Lezcano wrote:
>> On 25/07/2025 11:03, Krzysztof Kozlowski wrote:
>>> Commit 5d86e479193b ("clocksource/drivers/exynos_mct: Add module
>>> support") introduced section mismatch failures.
>>> Commit 7e477e9c4eb4 ("clocksource/drivers/exynos_mct: Fix section
>>> mismatch from the module conversion") replaced these to other section
>>> mismatch failures:
>>>
>>>    WARNING: modpost: vmlinux: section mismatch in reference: mct_init_dt+0x164 (section: .text) -> register_current_timer_delay (section: .init.text)
>>>    WARNING: modpost: vmlinux: section mismatch in reference: mct_init_dt+0x20c (section: .text) -> register_current_timer_delay (section: .init.text)
>>>    ERROR: modpost: Section mismatches detected.
>>>
>>> No progress on real fixing of these happened (intermediary fix was still
>>> not tested), so revert both commits till the work is prepared correctly.
>>
>> Please don't claim the fix was not tested. I reproduced the section 
> 
> 
> section mismatch code MUST BE tested with enabled DEBUG_SECTION_MISMATCH
> and disabled SECTION_MISMATCH_WARN_ONLY. If you have warnings which you
> missed (although if you have warnings what did you fix?), means you did
> not prepare testing setup.
> 
>> mismatch, tested it and figured out it was indeed fixing the issue. I 
>> just missed the error because it sounds very close to the first one 
>> reported initially and I did the confusion.
>>
>> The driver is not supposed to be compiled as a module on ARM32.
>>
>> The option tristate "Exynos multi core timer driver" if ARM64 is 
>> misleading. From this change, the defconfig on ARM can do 
>> CONFIG_EXYNOS_MCT=m which should not be allowed.
>>
>> Before getting wild and revert everything, let's try to find a proper 
>> fix for that.
> 
> I am not wild here. The issue is there since 9 days.
BTW, merge window will start anytime soon, so if you do not apply this
revert and do not fix it soon, it means NOTHING during merge window will
be tested on Exynos.

Why?

Because my builds for Exynos rely on correct sections and they fail.
Failed builds means: no boots.

No boots means no testing.

And if this reaches rc1 (imagine you send fixes AFTER rc1), then all my
branches will be non-booting as well.

Time to "not be wild" was 9 days ago when you received reply from Arnd.
Now reverting these is the appropriate step. None of this work was
tested on arm32 Exynos, BTW.

Best regards,
Krzysztof