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

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Date:	Wed, 27 Aug 2014 21:02:31 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	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>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Will Deacon <will.deacon@....com>
CC:	Wang Nan <wangnan0@...wei.com>, Pei Feiyue <peifeiyue@...wei.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v5 2/3] kprobes: copy ainsn after alloc aggr kprobe

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;
+
+	/*
+	 * copy gives arch_prepare_optimized_kprobe
+	 * more information
+	 */
+	copy_kprobe(p, &op->kp);
 	arch_prepare_optimized_kprobe(op);
 
 	return &op->kp;
-- 
1.8.4

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