selftests/ftrace: Fix unique symbol check in kprobe_non_uniq_symbol.tcgrafted

The current regex also matches symbols in modules, which makes the
test fail on s390 where name_show is present only once in the kernel,
but also multiple times in modules:

000001b1401cdc20 t name_show
000001b0c05e6c40 t name_show    [mdev]
000001b0c0495f30 t name_show    [i2c_core]

Fix this by changing the regular expression to only match the function
name.

Link: https://lore.kernel.org/all/20260909092954.2200558-1-svens@linux.ibm.com/

Fixes: 03b80ff8023a ("selftests/ftrace: Add new test case which checks non unique symbol")
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

1 files changed, 34 insertions, 0 deletions

diff --git a/lib/memcat_p.c b/lib/memcat_p.c
new file mode 100644
index 000000000..b810fbc66
--- /dev/null
+++ b/lib/memcat_p.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/slab.h>
+
+/*
+ * Merge two NULL-terminated pointer arrays into a newly allocated
+ * array, which is also NULL-terminated. Nomenclature is inspired by
+ * memset_p() and memcat() found elsewhere in the kernel source tree.
+ */
+void **__memcat_p(void **a, void **b)
+{
+	void **p = a, **new;
+	int nr;
+
+	/* count the elements in both arrays */
+	for (nr = 0, p = a; *p; nr++, p++)
+		;
+	for (p = b; *p; nr++, p++)
+		;
+	/* one for the NULL-terminator */
+	nr++;
+
+	new = kmalloc_array(nr, sizeof(void *), GFP_KERNEL);
+	if (!new)
+		return NULL;
+
+	/* nr -> last index; p points to NULL in b[] */
+	for (nr--; nr >= 0; nr--, p = p == b ? &a[nr] : p - 1)
+		new[nr] = *p;
+
+	return new;
+}
+EXPORT_SYMBOL_GPL(__memcat_p);
+