linux-kernel - [RFC PATCH v4 34/34] early kprobes: enable optimization of kprobes on ftrace before ftrace is ready.

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Date:	Mon, 2 Mar 2015 22:25:12 +0800
From:	Wang Nan <wangnan0@...wei.com>
To:	<rostedt@...dmis.org>, <masami.hiramatsu.pt@...achi.com>,
	<mingo@...e.hu>, <linux@....linux.org.uk>, <tixy@...aro.org>
CC:	<lizefan@...wei.com>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: [RFC PATCH v4 34/34] early kprobes: enable optimization of kprobes on ftrace before ftrace is ready.

Uses ftrace_process_loc_early() introduced by previous patch to
convert ftrace entries to nops before ftrace_init(). For x86, original
kprobe entries are 'call' and are optimizable only after this conversion.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
 kernel/kprobes.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 56fb8c8..1ec8e6e 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1602,6 +1602,9 @@ int register_kprobe(struct kprobe *p)
 		goto out;
 	}
 
+	if (p->flags & KPROBE_FLAG_FTRACE_EARLY)
+		ftrace_process_loc_early((unsigned long)p->addr);
+
 	mutex_lock(&text_mutex);	/* Avoiding text modification */
 	ret = prepare_kprobe(p);
 	mutex_unlock(&text_mutex);
-- 
1.8.4

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