linux-kernel - Re: [PATCH v7 2/2] ARM: ftrace: Add MODULE

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Message-ID: <e726be33-bc03-0515-f430-c5a34ebc3619@nokia.com>
Date:   Wed, 10 Mar 2021 18:17:54 +0100
From:   Alexander Sverdlin <alexander.sverdlin@...ia.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Qais Yousef <qais.yousef@....com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH v7 2/2] ARM: ftrace: Add MODULE_PLTS support

Hi!

On 10/03/2021 17:14, Florian Fainelli wrote:
>>>>> I tried on 5.12-rc2 and 5.11 but couldn't reproduce the problem using your
>>> I still can't reproduce on 5.12-rc2.
>>>
>>> I do have CONFIG_ARM_MODULE_PLTS=y. Do you need to do something else after
>>> loading the module? I tried starting ftrace, but maybe there's a particular
>>> combination required?
>> You need to load a BIG module, so big that it has no place in the modules area
>> any more and goes to vmalloc area.
> You absolutely need a very big module maybe more than one. When I tested
> this, I could use the two proprietary modules (*sigh*) that I needed to
> exercise against and loading one but not the other was not enough to
> make the second module loading spill into vmalloc space.

Here is what I use instead of these real world "proprietary" modules (which of course
were the real trigger for the patch):

https://www.spinics.net/lists/arm-kernel/msg878599.html

-- 
Best regards,
Alexander Sverdlin.