linux-kernel - Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump labels

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Message-ID: <20151109094841.GG17308@twins.programming.kicks-ass.net>
Date:	Mon, 9 Nov 2015 10:48:41 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Brian Gerst <brgerst@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump labels

On Sat, Nov 07, 2015 at 10:16:37AM -0800, Andy Lutomirski wrote:

> >> Unfortunately, these only work if HAVE_JUMP_LABEL ....
> 
> Yeah, I don't really like that either.  I think that the real fix
> would be to compile in the runtime jump label bits unconditionally.
> Admittedly it would bloat the kernel image a little bit for
> !CONFIG_JUMP_LABEL or if build with an older gcc, and that's even less
> appropriate for 4.4 at this point.  Peter?

That is a _lot_ of code for just one user. I'll bet the tiny people
won't be happy about that.


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