Blackfin: kgdb_test: rework code to avoid -O0 usage

__kfree_rcu() in rcupdate.h bugs when parameter offset is not a constant
at compile time.  Since we build the kgdb_test module with -O0 and it
includes this header file, we hit the bug.  So drop the -O0 and mark the
one func we need for the test as noinline (so we can set a breakpoint on
it and have it be hit).

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/kernel/kgdb_test.c b/arch/blackfin/kernel/kgdb_test.c
index 2a6e9db..4a7dcfe 100644
--- a/arch/blackfin/kernel/kgdb_test.c
+++ b/arch/blackfin/kernel/kgdb_test.c
@@ -50,8 +50,7 @@
 
 #endif
 
-
-int kgdb_test(char *name, int len, int count, int z)
+noinline int kgdb_test(char *name, int len, int count, int z)
 {
 	pr_alert("kgdb name(%d): %s, %d, %d\n", len, name, count, z);
 	count = z;