[PATCH 2/3] trace/kprobes: allow return probes with offsets and absolute addresses

[Naveen N. Rao]

Since the kernel includes many non-global functions with same names, we
will need to use offsets from other symbols (typically _text/_stext) or
absolute addresses to place return probes on specific functions. Also,
the core register_kretprobe() API never forbid use of offsets or
absolute addresses with kretprobes.

Allow its use with the trace infrastructure.

Signed-off-by: Naveen N. Rao <naveen.n....@linux.vnet.ibm.com>
---
 kernel/trace/trace_kprobe.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 7ad9e53ad174..2768cb60ebd7 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -679,10 +679,6 @@ static int create_trace_kprobe(int argc, char **argv)
                return -EINVAL;
        }
        if (isdigit(argv[1][0])) {
-               if (is_return) {
-                       pr_info("Return probe point must be a symbol.\n");
-                       return -EINVAL;
-               }
                /* an address specified */
                ret = kstrtoul(&argv[1][0], 0, (unsigned long *)&addr);
                if (ret) {
@@ -698,10 +694,6 @@ static int create_trace_kprobe(int argc, char **argv)
                        pr_info("Failed to parse symbol.\n");
                        return ret;
                }
-               if (offset && is_return) {
-                       pr_info("Return probe must be used without offset.\n");
-                       return -EINVAL;
-               }
        }
        argc -= 2; argv += 2;
 
-- 
2.11.0