linux-kernel - Re: static_branch_enable() does not work from a _

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Date:   Wed, 16 Dec 2020 14:23:12 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jessica Yu <jeyu@...nel.org>
Cc:     Dexuan Cui <decui@...rosoft.com>, Ingo Molnar <mingo@...nel.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: static_branch_enable() does not work from a __init function?

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.