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Date:   Wed, 16 Dec 2020 14:27:42 +0100
From:   Jessica Yu <>
To:     Peter Zijlstra <>
Cc:     Dexuan Cui <>, Ingo Molnar <>,
        Daniel Bristot de Oliveira <>,
        "" <>,
        "" <>,
        Josh Poimboeuf <>
Subject: Re: static_branch_enable() does not work from a __init function?

+++ Peter Zijlstra [16/12/20 14:23 +0100]:
>On Wed, Dec 16, 2020 at 02:10:16PM +0100, Jessica Yu wrote:
>> +++ Peter Zijlstra [16/12/20 13:47 +0100]:
>> > Only because we're having .init=false, incorrectly. See the other email.
>> Ah yeah, you're right. I also misread the intention of the if
>> conditional :/ If we're currently running an init function it's fine,
>> but after that it will be unsafe.
>Exactly, seeing how it'll end up being freed and such ;-)
>> Btw, your patch seems to work for me, using the test module provided
>> by Dexuan.
>Ah, excellent. I couldn't be bothered to figure out how to build a
>module ;-)
>I'll add your Tested-by and go queue it for /urgent I suppose.

That's fine by me :-)

    Tested-by: Jessica Yu <>

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