samples/kretprobe: fix the wrong type

The regs_return_value() returns "unsigned long" or "long" value.  But the
retval is int type now, it may cause overflow, the log may becomes:

    [ 2911.078869] do_brk returned -2003877888 and took 4620 ns to execute

This patch converts the retval to "unsigned long" type, and fixes the
overflow issue.

Link: http://lkml.kernel.org/r/1464143083-3877-4-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>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/samples/kprobes/kretprobe_example.c b/samples/kprobes/kretprobe_example.c
index adc83e9f59d0..7f9060f435cd 100644
--- a/samples/kprobes/kretprobe_example.c
+++ b/samples/kprobes/kretprobe_example.c
@@ -55,14 +55,14 @@ static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
  */
 static int ret_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
 {
-        int retval = regs_return_value(regs);
+        unsigned long retval = regs_return_value(regs);
         struct my_data *data = (struct my_data *)ri->data;
         s64 delta;
         ktime_t now;
 
         now = ktime_get();
         delta = ktime_to_ns(ktime_sub(now, data->entry_stamp));
-        pr_info("%s returned %d and took %lld ns to execute\n",
+        pr_info("%s returned %lu and took %lld ns to execute\n",
                         func_name, retval, (long long)delta);
         return 0;
 }