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

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump labels
Date 2015-11-09 10:50 +0100
Message-ID <qsRfj-4E2-9@gated-at.bofh.it> (permalink)
References (3 earlier) <qsf0m-4OL-13@gated-at.bofh.it> <qsf0m-4OL-11@gated-at.bofh.it> <qsfa2-58t-17@gated-at.bofh.it> <qsfa2-58t-15@gated-at.bofh.it> <qsgfM-5MQ-3@gated-at.bofh.it>
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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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Thread

[PATCH 0/4] x86 entry stuff, maybe for 4.4 Andy Lutomirski <luto@kernel.org> - 2015-11-07 00:20 +0100
  [PATCH 4/4] x86/entry/64: Bypass enter_from_user_mode on non-context-tracking boots Andy Lutomirski <luto@kernel.org> - 2015-11-07 00:20 +0100
    Re: [PATCH 4/4] x86/entry/64: Bypass enter_from_user_mode on  non-context-tracking boots Ingo Molnar <mingo@kernel.org> - 2015-11-09 10:00 +0100
  [PATCH 3/4] x86/asm: Add asm macros for static keys/jump labels Andy Lutomirski <luto@kernel.org> - 2015-11-07 00:20 +0100
    Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump  labels Thomas Gleixner <tglx@linutronix.de> - 2015-11-07 12:30 +0100
      Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump  labels Thomas Gleixner <tglx@linutronix.de> - 2015-11-07 18:00 +0100
        Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump  labels Thomas Gleixner <tglx@linutronix.de> - 2015-11-07 18:10 +0100
          Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump labels Andy Lutomirski <luto@amacapital.net> - 2015-11-07 19:20 +0100
            Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump labels Peter Zijlstra <peterz@infradead.org> - 2015-11-09 10:50 +0100
          Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump labels Andy Lutomirski <luto@amacapital.net> - 2015-11-08 17:20 +0100
        Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump labels Andy Lutomirski <luto@amacapital.net> - 2015-11-07 18:10 +0100
      Re: [PATCH 3/4] x86/asm: Add asm macros for static keys/jump labels Andy Lutomirski <luto@amacapital.net> - 2015-11-07 18:00 +0100

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