linux-kernel - Re: [PATCH 1/3] Make struct jprobe.entry a void *

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Message-ID: <20070626035146.GA16713@in.ibm.com>
Date:	Tue, 26 Jun 2007 09:21:46 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...abs.org>,
	<linux-ia64@...r.kernel.org>, <linux-arch@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Christoph Hellwig <hch@....de>,
	<anil.s.keshavamurthy@...el.com>
Subject: Re: [PATCH 1/3] Make struct jprobe.entry a void *

On Tue, Jun 26, 2007 at 11:48:50AM +1000, Michael Ellerman wrote:
> Currently jprobe.entry is a kprobe_opcode_t *, but that's a lie. On some
> platforms it doesn't point to an opcode at all, it points to a function
> descriptor.
> 
> It's really a pointer to something that the arch code can turn into a
> function entry point. And that's what actually happens, none of the
> generic code ever looks at jprobe.entry, it's only ever dereferenced
> by arch code.
> 
> So just make it a void *.
> 
> Signed-off-by: Michael Ellerman <michael@...erman.id.au>

Tested on powerpc. Ack to all three patches plus Andrew's declaration
fixup.

Thanks Michael for the patches.

Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>

> ---
> 
> It isn't obvious where kprobes patches should go, is anyone "the" maintainer?
> Instead I've just sent this to everyone who'd touched the code lately, or
> might be otherwise interested.
> 
> 
>  include/linux/kprobes.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
> index 23adf60..f4e53b7 100644
> --- a/include/linux/kprobes.h
> +++ b/include/linux/kprobes.h
> @@ -116,7 +116,7 @@ struct kprobe {
>   */
>  struct jprobe {
>  	struct kprobe kp;
> -	kprobe_opcode_t *entry;	/* probe handling code to jump to */
> +	void *entry;	/* probe handling code to jump to */
>  };
> 
>  DECLARE_PER_CPU(struct kprobe *, current_kprobe);
> -- 
> 1.5.1.3.g7a33b
-
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