From d04659ac94528e9224dbf1aed37dd11dd952cacc Mon Sep 17 00:00:00 2001
From: Huang Shijie <shijie.huang@arm.com>
Date: Fri, 20 May 2016 17:04:33 -0700
Subject: samples/kprobes: add a new module parameter

Add 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 flexible; we
can test any functions with this module with

	# insmod kprobe_example.ko symbol="xxx"

Link: http://lkml.kernel.org/r/1463535417-29637-1-git-send-email-shijie.huang@arm.com
Signed-off-by: Huang Shijie <shijie.huang@arm.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steve Capper <steve.capper@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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 */
-- 
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