linux-kernel - [RFC PATCH v4 05/34] early kprobes: introduce kprobe_is

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Date:	Mon, 2 Mar 2015 22:24:43 +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 05/34] early kprobes: introduce kprobe_is_early for futher early kprobe use.

Following early kprobe patches will enable kprobe registering very
early, even before kprobe system initialized. kprobe_is_early() can be
used to check whether we are working on early kprobes.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
 include/linux/kprobes.h | 2 ++
 kernel/kprobes.c        | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 1ab5475..a3de759 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -50,6 +50,8 @@
 #define KPROBE_REENTER		0x00000004
 #define KPROBE_HIT_SSDONE	0x00000008
 
+extern bool kprobes_is_early(void);
+
 #else /* CONFIG_KPROBES */
 typedef int kprobe_opcode_t;
 struct arch_specific_insn {
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 427d761..2e728a4 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -69,6 +69,12 @@
 
 static int kprobes_initialized;
 static int kprobes_blacklist_initialized;
+
+bool kprobes_is_early(void)
+{
+	return !(kprobes_initialized && kprobes_blacklist_initialized);
+}
+
 static struct hlist_head kprobe_table[KPROBE_TABLE_SIZE];
 static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];
 
-- 
1.8.4

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