linux-kernel - Re: [PATCH v5 2/3] kprobes: copy ainsn after alloc aggr kprobe

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Date:	Thu, 28 Aug 2014 18:39:40 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	Russell King <linux@....linux.org.uk>,
	"David A. Long" <dave.long@...aro.org>,
	Jon Medhurst <tixy@...aro.org>,
	Taras Kondratiuk <taras.kondratiuk@...aro.org>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Will Deacon <will.deacon@....com>,
	Pei Feiyue <peifeiyue@...wei.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/3] kprobes: copy ainsn after alloc aggr kprobe

(2014/08/27 22:02), Wang Nan wrote:
> Copy old kprobe to newly alloced optimized_kprobe before
> arch_prepare_optimized_kprobe(). Original kprove can brings more
> information to optimizer.
> 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: "David A. Long" <dave.long@...aro.org> 
> Cc: Jon Medhurst <tixy@...aro.org>
> Cc: Taras Kondratiuk <taras.kondratiuk@...aro.org>
> Cc: Ben Dooks <ben.dooks@...ethink.co.uk>
> Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Will Deacon <will.deacon@....com>
> ---
>  kernel/kprobes.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> index 3995f54..33cf568 100644
> --- a/kernel/kprobes.c
> +++ b/kernel/kprobes.c
> @@ -730,7 +730,12 @@ static struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
>  		return NULL;
>  
>  	INIT_LIST_HEAD(&op->list);
> -	op->kp.addr = p->addr;

Do not remove this, since copy_kprobe() doesn't copy kp.addr.

static inline void copy_kprobe(struct kprobe *ap, struct kprobe *p)
{
        memcpy(&p->opcode, &ap->opcode, sizeof(kprobe_opcode_t));
        memcpy(&p->ainsn, &ap->ainsn, sizeof(struct arch_specific_insn));
}

Thank you,

> +
> +	/*
> +	 * copy gives arch_prepare_optimized_kprobe
> +	 * more information
> +	 */
> +	copy_kprobe(p, &op->kp);
>  	arch_prepare_optimized_kprobe(op);
>  
>  	return &op->kp;
> 


-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Research Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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