linux-kernel - Re: [PATCH 1/2] jump label: introduce static

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Date:	Fri, 11 Mar 2011 03:05:40 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jason Baron <jbaron@...hat.com>, peterz@...radead.org,
	hpa@...or.com, mathieu.desnoyers@...ymtl.ca, mingo@...e.hu,
	tglx@...utronix.de, andi@...stfloor.org, roland@...hat.com,
	rth@...hat.com, masami.hiramatsu.pt@...achi.com,
	fweisbec@...il.com, avi@...hat.com, davem@...emloft.net,
	sam@...nborg.org, ddaney@...iumnetworks.com,
	michael@...erman.id.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] jump label: introduce static_branch() interface

On Thu, Mar 10, 2011 at 03:56:56PM -0500, Steven Rostedt wrote:

> On Wed, 2011-03-09 at 15:47 -0500, Jason Baron wrote:
> 
> >  arch/mips/include/asm/jump_label.h  |   22 +-
> >  arch/mips/kernel/jump_label.c       |    2 +-
> >  arch/sparc/include/asm/jump_label.h |   25 +-
> >  arch/x86/include/asm/alternative.h  |    3 +-
> >  arch/x86/include/asm/jump_label.h   |   26 +-
> >  arch/x86/kernel/alternative.c       |    2 +-
> >  arch/x86/kernel/jump_label.c        |    2 +-
> >  arch/x86/kernel/module.c            |    1 +
> >  include/asm-generic/vmlinux.lds.h   |   14 +-
> >  include/linux/dynamic_debug.h       |    2 -
> >  include/linux/jump_label.h          |   86 ++++---
> >  include/linux/jump_label_ref.h      |   44 ---
> >  include/linux/perf_event.h          |   26 +-
> >  include/linux/tracepoint.h          |   22 +-
> >  kernel/jump_label.c                 |  537 ++++++++++++++---------------------
> >  kernel/perf_event.c                 |    4 +-
> >  kernel/tracepoint.c                 |   23 +-
> >  17 files changed, 352 insertions(+), 489 deletions(-)
> >  delete mode 100644 include/linux/jump_label_ref.h
> > 
> > diff --git a/arch/mips/include/asm/jump_label.h b/arch/mips/include/asm/jump_label.h
> > index 7622ccf..1881b31 100644
> > --- a/arch/mips/include/asm/jump_label.h
> > +++ b/arch/mips/include/asm/jump_label.h
> > @@ -20,16 +20,18 @@
> >  #define WORD_INSN ".word"
> >  #endif
> >  
> > -#define JUMP_LABEL(key, label)						\
> > -	do {								\
> > -		asm goto("1:\tnop\n\t"					\
> > -			"nop\n\t"					\
> > -			".pushsection __jump_table,  \"a\"\n\t"		\
> > -			WORD_INSN " 1b, %l[" #label "], %0\n\t"		\
> > -			".popsection\n\t"				\
> > -			: :  "i" (key) :  : label);			\
> > -	} while (0)
> > -
> > +static __always_inline bool arch_static_branch(struct jump_label_key *key)
> > +{
> > +	asm goto("1:\tnop\n\t"
> > +		"nop\n\t"
> > +		".pushsection __jump_table,  \"aw\"\n\t"
> > +		WORD_INSN " 1b, %l[l_yes], %0\n\t"
> > +		".popsection\n\t"
> > +		: :  "i" (key) : : l_yes);
> > +	return false;
> > +l_yes:
> > +	return true;
> > +}
> >  
> >  #endif /* __KERNEL__ */
> >  
> > diff --git a/arch/mips/kernel/jump_label.c b/arch/mips/kernel/jump_label.c
> > index 6001610..09ac7ca 100644
> > --- a/arch/mips/kernel/jump_label.c
> > +++ b/arch/mips/kernel/jump_label.c
> > @@ -6,11 +6,11 @@
> >   * Copyright (c) 2010 Cavium Networks, Inc.
> >   */
> >  
> > -#include <linux/jump_label.h>
> >  #include <linux/kernel.h>
> >  #include <linux/memory.h>
> >  #include <linux/mutex.h>
> >  #include <linux/types.h>
> > +#include <linux/jump_label.h>
> >  #include <linux/cpu.h>
> >  
> >  #include <asm/cacheflush.h>
> 
> Hi Ralf,
> 
> Can I get your Acked-by on this patch.

You could have gotten it quicker if I had been on cc ...

I'm happy with the change to arch/mips/include/asm/jump_label.h and
assuming that the change to arch/mips/kernel/jump_label.c will be dropped

Acked-by: Ralf Baechle <ralf@...ux-mips.org>

  Ralf
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