linux-kernel - Re: [PATCH v2] retpoline/module: Warn for missing retpoline in module

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Date:   Tue, 16 Jan 2018 12:59:56 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Andi Kleen <andi@...stfloor.org>, dwmw@...zon.co.uk,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, arjan.van.de.ven@...el.com,
        peterz@...radead.org, Andi Kleen <ak@...ux.intel.com>,
        jeyu@...nel.org
Subject: Re: [PATCH v2] retpoline/module: Warn for missing retpoline in module

Thanks.

I just sent a v3 that changes the VERMAGIC only, based on Greg's 
earlier feedback.

It has the drawbacks that it:
- refuses loading instead of warns
- doesn't stop refusing when the feature is runtime disabled

But it's much simpler, just a few lines of ifdef.

We can either go with the v3, or rework this one into a v4?

-Andi