[PATCH v2] kprobes: add a new module parameter

[Huang Shijie]

This patch adds a new module parameter which can be used as the
symbol name. Without this patch, we can only test the "_do_fork" function
with this kernel module. With this patch, the module becomes more flexable,
we can test any functions with this module with:
   #insmod kprobe_example.ko symbol="xxx"

Signed-off-by: Huang Shijie <shijie.huang@xxxxxxx>
---
v1 -- > v2:
	Add more comment for this patch.
---
 samples/kprobes/kprobe_example.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
index 727eb21..2bb190d 100644
--- a/samples/kprobes/kprobe_example.c
+++ b/samples/kprobes/kprobe_example.c
@@ -14,9 +14,13 @@
 #include <linux/module.h>
 #include <linux/kprobes.h>
 
+#define MAX_SYMBOL_LEN	64
+static char symbol[MAX_SYMBOL_LEN] = "_do_fork";
+module_param_string(symbol, symbol, sizeof(symbol), 0644);
+
 /* For each probe you need to allocate a kprobe structure */
 static struct kprobe kp = {
-	.symbol_name	= "_do_fork",
+	.symbol_name	= symbol,
 };
 
 /* kprobe pre_handler: called just before the probed instruction is executed */
-- 
2.5.5