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

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Date:	Sun, 8 Nov 2015 08:16:11 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	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>, Peter Zijlstra <peterz@...radead.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 7, 2015 at 9:08 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Sat, 7 Nov 2015, Andy Lutomirski wrote:
>> On Sat, Nov 7, 2015 at 8:58 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
>> True.  But I hid it in a header file, too, but it was just a different
>> header file -- I had it all hidden away as CALL_ENTER_FROM_USER_MODE.
>
> It probably does not really make a difference :)
>
> I just got triggered by you saying:
>
>> Unfortunately, these only work if HAVE_JUMP_LABEL ....
>

Looking again, my patch is crappy is one obvious respect: on
non-HAVE_JUMP_LABEL kernels, I'm still generating a macro that will
compile but do the wrong thing.  I'll add better comments and the
correct ifdef in v2.  That will make it much harder to screw up
without causing a compiler error.

--Andy
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