[RFC,v4,05/34] early kprobes: introduce kprobe_is_early for futher early kprobe use.

Commit Message

Wang Nan March 2, 2015, 2:24 p.m. UTC

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 <[e-mail]>
---
 include/linux/kprobes.h | 2 ++
 kernel/kprobes.c        | 6 ++++++
 2 files changed, 8 insertions(+)

Patch

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];