selftests/bpf: Add a test for objects stuck in free_by_rcu_ttracegrafted

Delete all elements of BPF_F_NO_PREALLOC hash map in one batch. The first
free_bulk() starts RCU tasks trace GP and the rest of the elements are
freed while it's in flight. Wait for call_rcu_ttrace_in_progress to clear
in bpf_mem_cache of every cpu and check that free_by_rcu_ttrace and
waiting_for_gp_ttrace lists are empty.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20260930095920.601738-4-alexei.starovoitov@gmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/s390/char/keyboard.h b/drivers/s390/char/keyboard.h
new file mode 100644
index 000000000..c06d399b9
--- /dev/null
+++ b/drivers/s390/char/keyboard.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *    ebcdic keycode functions for s390 console drivers
+ *
+ *    Copyright IBM Corp. 2003
+ *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
+ */
+
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/keyboard.h>
+
+#define NR_FN_HANDLER	20
+
+struct kbd_data;
+
+extern int ebc_funcbufsize, ebc_funcbufleft;
+extern char *ebc_func_table[MAX_NR_FUNC];
+extern char ebc_func_buf[];
+extern char *ebc_funcbufptr;
+extern unsigned int ebc_keymap_count;
+
+extern struct kbdiacruc ebc_accent_table[];
+extern unsigned int ebc_accent_table_size;
+extern unsigned short *ebc_key_maps[MAX_NR_KEYMAPS];
+extern unsigned short ebc_plain_map[NR_KEYS];
+
+typedef void (fn_handler_fn)(struct kbd_data *);
+
+/*
+ * FIXME: explain key_maps tricks.
+ */
+
+struct kbd_data {
+	struct tty_port *port;
+	unsigned short **key_maps;
+	char **func_table;
+	fn_handler_fn **fn_handler;
+	struct kbdiacruc *accent_table;
+	unsigned int accent_table_size;
+	unsigned int diacr;
+	unsigned short sysrq;
+};
+
+struct kbd_data *kbd_alloc(void);
+void kbd_free(struct kbd_data *);
+void kbd_ascebc(struct kbd_data *, unsigned char *);
+
+void kbd_keycode(struct kbd_data *, unsigned int);
+int kbd_ioctl(struct kbd_data *, unsigned int, unsigned long);
+
+/*
+ * Helper Functions.
+ */
+static inline void
+kbd_put_queue(struct tty_port *port, int ch)
+{
+	tty_insert_flip_char(port, ch, 0);
+	tty_flip_buffer_push(port);
+}
+
+static inline void
+kbd_puts_queue(struct tty_port *port, char *cp)
+{
+	while (*cp)
+		tty_insert_flip_char(port, *cp++, 0);
+	tty_flip_buffer_push(port);
+}