linux-kernel - Re: [tip:perf/core] jump label: x86 support

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Message-ID: <20100924163435.GE2887@redhat.com>
Date:	Fri, 24 Sep 2010 12:34:35 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] jump label: x86 support

On Fri, Sep 24, 2010 at 09:19:36AM -0700, H. Peter Anvin wrote:
> On 09/24/2010 02:01 AM, tip-bot for Jason Baron wrote:
> > Commit-ID:  d9f5ab7b1c0a520867af389bab5d5fcdbd0e407e
> > Gitweb:     http://git.kernel.org/tip/d9f5ab7b1c0a520867af389bab5d5fcdbd0e407e
> > Author:     Jason Baron <jbaron@...hat.com>
> > AuthorDate: Fri, 17 Sep 2010 11:09:22 -0400
> > Committer:  Steven Rostedt <rostedt@...dmis.org>
> > CommitDate: Wed, 22 Sep 2010 16:33:03 -0400
> > 
> > jump label: x86 support
> > 
> > add x86 support for jump label. I'm keeping this patch separate so its clear
> > to arch maintainers what was required for x86 support this new feature.
> > Hopefully, it wouldn't be too painful for other archs.
> > 
> > Signed-off-by: Jason Baron <jbaron@...hat.com>
> > LKML-Reference: <f838f49f40fbea0254036194be66dc48b598dcea.1284733808.git.jbaron@...hat.com>
> > 
> > [ cleaned up some formatting ]
> > 
> > Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> > ---
> >  arch/x86/Kconfig                  |    1 +
> >  arch/x86/include/asm/jump_label.h |   47 ++++++++++++++++++++++++++++++++++
> >  arch/x86/kernel/Makefile          |    2 +-
> >  arch/x86/kernel/jump_label.c      |   50 +++++++++++++++++++++++++++++++++++++
> >  arch/x86/kernel/module.c          |    3 ++
> >  5 files changed, 102 insertions(+), 1 deletions(-)
> > 
> > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> > index cea0cd9..afcd663 100644
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -59,6 +59,7 @@ config X86
> >  	select ANON_INODES
> >  	select HAVE_ARCH_KMEMCHECK
> >  	select HAVE_USER_RETURN_NOTIFIER
> > +	select HAVE_ARCH_JUMP_LABEL if !CC_OPTIMIZE_FOR_SIZE
> >  
> >  config INSTRUCTION_DECODER
> >  	def_bool (KPROBES || PERF_EVENTS)
> 
> What the heck?  I had NAKed at least this chunk already...
> 
> 	-hpa
> 

The !CC_OPTIMIZE_FOR_SIZE condition is subsequently removed by a
follow-on patch as part of the commit series.

thanks,

-Jason
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