linux-kernel - Re: [PATCH 1/2] kprobes: Introduce kprobe_handle

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Date:	Fri, 29 Feb 2008 08:30:43 -0800
From:	"Harvey Harrison" <harvey.harrison@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	linux-arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] kprobes: Introduce kprobe_handle_fault()

On Fri, Feb 29, 2008 at 3:16 AM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Sat, 02 Feb 2008 19:00:23 -0800 Harvey Harrison <harvey.harrison@...il.com> wrote:
>
>  > Use a central kprobe_handle_fault() inline in kprobes.h to remove
>  > all of the arch-dependant, practically identical implementations in
>  > avr32, ia64, powerpc, s390, sparc64, and x86.
>  >
>  > avr32 was the only arch without the preempt_disable/enable pair
>  > in its notify_page_fault implementation.
>  >
>  > This uncovered a possible bug in the s390 version as that purely
>  > copied the x86 version unconditionally passing 14 as the trapnr
>  > rather than the error_code parameter.  s390 is changed to pass
>  > error_code in this patch.
>  >
>  > Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
>  > ---
>  > Andrew, 1/2 is low risk, 2/2 has been tested on x86-32 and 64,
>  > but the !preemptible invariant seems correct.
>  >
>  >  arch/arm/mm/fault.c     |   25 +------------------------
>  >  arch/avr32/mm/fault.c   |   21 +--------------------
>  >  arch/ia64/mm/fault.c    |   24 +-----------------------
>  >  arch/powerpc/mm/fault.c |   25 +------------------------
>  >  arch/s390/mm/fault.c    |   25 +------------------------
>  >  arch/sparc64/mm/fault.c |   23 +----------------------
>  >  arch/x86/mm/fault.c     |   26 ++------------------------
>  >  include/linux/kprobes.h |   20 ++++++++++++++++++++
>  >  8 files changed, 28 insertions(+), 161 deletions(-)
>
>  Breaks the ia64 build:
>
>  include/linux/kprobes.h: In function `kprobe_handle_fault':
>  include/linux/kprobes.h:234: error: implicit declaration of function `kprobe_fault_handler'
>
>  and ia64 doesn't implement kprobe_fault_handler() so there's no easy fix
>  here.

Yes there is, ia64 apparently called theirs kprobes_handle_fault, sorry I didn't
notice the extra 's'.  Want a new patch, or will you change the three
occurances?

Harvey
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