linux-kernel - Re: [PATCH] make CALLER

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Date:	Wed, 25 Feb 2009 22:13:41 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] make CALLER_ADDRx overwriteable


On Thu, 26 Feb 2009, Ingo Molnar wrote:

> 
> * Uwe Kleine-K?nig <u.kleine-koenig@...gutronix.de> wrote:
> 
> > The current definition of CALLER_ADDRx isn't suitable for all platforms.
> > E.g. for ARM __builtin_return_address(N) doesn't work for N > 0 and
> > AFAIK for powerpc there are no frame pointers needed to have a working
> > __builtin_return_address.  This patch allows defining the CALLER_ADDRx
> > macros in <asm/ftrace.h> and let these take precedence.
> > 
> > Signed-off-by: Uwe Kleine-K?nig <u.kleine-koenig@...gutronix.de>
> > ---
> > Hello,
> > 
> > I think I don't break any architecture with this patch:
> > 
> > 	$ for arch in $(ls arch/); do if test ! -d arch/$arch; then continue; fi; test -f arch/$arch/include/asm/ftrace.h || test -f include/asm-$arch/ftrace.h || { echo -n "$arch: "; git grep FTRACE arch/$arch | wc -l; } done
> > 	alpha: 0
> > 	avr32: 0
> > 	blackfin: 0
> > 	cris: 0
> > 	frv: 0
> > 	h8300: 0
> > 	m32r: 0
> > 	m68k: 0
> > 	m68knommu: 0
> > 	mips: 0
> > 	mn10300: 0
> > 	parisc: 0
> > 	um: 0
> > 	xtensa: 0
> > 
> > So all archs that don't have <asm/ftrace.h> seem not to use FTRACE.
> > 
> > Best regards
> > Uwe
> > 
> >  include/linux/ftrace.h |   41 +++++++++++++++++++++--------------------
> >  1 files changed, 21 insertions(+), 20 deletions(-)
> > 
> > diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
> > index 847bb3c..9d8d362 100644
> > --- a/include/linux/ftrace.h
> > +++ b/include/linux/ftrace.h
> > @@ -11,6 +11,8 @@
> >  #include <linux/bitops.h>
> >  #include <linux/sched.h>
> >  
> > +#include <asm/ftrace.h>
> > +
> >  #ifdef CONFIG_FUNCTION_TRACER
> >  
> >  extern int ftrace_enabled;
> > @@ -103,8 +105,6 @@ struct ftrace_func_command {
> >  };
> >  
> >  #ifdef CONFIG_DYNAMIC_FTRACE
> > -/* asm/ftrace.h must be defined for archs supporting dynamic ftrace */
> > -#include <asm/ftrace.h>
> >  
> >  int ftrace_arch_code_modify_prepare(void);
> >  int ftrace_arch_code_modify_post_process(void);
> > @@ -282,24 +282,25 @@ static inline void __ftrace_enabled_restore(int enabled)
> >  #endif
> >  }
> >  
> > -#ifdef CONFIG_FRAME_POINTER
> > -/* TODO: need to fix this for ARM */
> > -# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
> > -# define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
> > -# define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
> > -# define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
> > -# define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
> > -# define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
> > -# define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
> > -#else
> > -# define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
> > -# define CALLER_ADDR1 0UL
> > -# define CALLER_ADDR2 0UL
> > -# define CALLER_ADDR3 0UL
> > -# define CALLER_ADDR4 0UL
> > -# define CALLER_ADDR5 0UL
> > -# define CALLER_ADDR6 0UL
> > -#endif
> > +#ifndef CALLER_ADDR0
> > +# ifdef CONFIG_FRAME_POINTER
> > +#  define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
> > +#  define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1))
> > +#  define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2))
> > +#  define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3))
> > +#  define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4))
> > +#  define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5))
> > +#  define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6))
> > +# else
> > +#  define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
> > +#  define CALLER_ADDR1 0UL
> > +#  define CALLER_ADDR2 0UL
> > +#  define CALLER_ADDR3 0UL
> > +#  define CALLER_ADDR4 0UL
> > +#  define CALLER_ADDR5 0UL
> > +#  define CALLER_ADDR6 0UL
> > +# endif
> > +#endif /* ifndef CALLER_ADDR0 */
> 
> Makes sense!
> 
> Acked-by: Ingo Molnar <mingo@...e.hu>

Thanks Ingo,

Uwe, I never got your email (but I can get it from my LKML mail box). I'm 
not sure if my ISP blocked you (I've been having issues with Hover.com 
ever since they bought out domaindirect.com), or my own email server.

But I'll grab it from LKML and test it out.

Thanks,

-- Steve

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