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, 83 insertions, 0 deletions

diff --git a/include/sound/seq_oss.h b/include/sound/seq_oss.h
new file mode 100644
index 000000000..7bf10a0fa
--- /dev/null
+++ b/include/sound/seq_oss.h
@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __SOUND_SEQ_OSS_H
+#define __SOUND_SEQ_OSS_H
+
+/*
+ * OSS compatible sequencer driver
+ *
+ * Copyright (C) 1998,99 Takashi Iwai
+ */
+
+#include <sound/asequencer.h>
+#include <sound/seq_kernel.h>
+
+/*
+ * argument structure for synthesizer operations
+ */
+struct snd_seq_oss_arg {
+	/* given by OSS sequencer */
+	int app_index;	/* application unique index */
+	int file_mode;	/* file mode - see below */
+	int seq_mode;	/* sequencer mode - see below */
+
+	/* following must be initialized in open callback */
+	struct snd_seq_addr addr;	/* opened port address */
+	void *private_data;	/* private data for lowlevel drivers */
+
+	/* note-on event passing mode: initially given by OSS seq,
+	 * but configurable by drivers - see below
+	 */
+	int event_passing;
+};
+
+
+/*
+ * synthesizer operation callbacks
+ */
+struct snd_seq_oss_callback {
+	struct module *owner;
+	int (*open)(struct snd_seq_oss_arg *p, void *closure);
+	int (*close)(struct snd_seq_oss_arg *p);
+	int (*ioctl)(struct snd_seq_oss_arg *p, unsigned int cmd, unsigned long arg);
+	int (*load_patch)(struct snd_seq_oss_arg *p, int format, const char __user *buf, int offs, int count);
+	int (*reset)(struct snd_seq_oss_arg *p);
+	int (*raw_event)(struct snd_seq_oss_arg *p, unsigned char *data);
+};
+
+/* flag: file_mode */
+#define SNDRV_SEQ_OSS_FILE_ACMODE		3
+#define SNDRV_SEQ_OSS_FILE_READ		1
+#define SNDRV_SEQ_OSS_FILE_WRITE		2
+#define SNDRV_SEQ_OSS_FILE_NONBLOCK	4
+
+/* flag: seq_mode */
+#define SNDRV_SEQ_OSS_MODE_SYNTH		0
+#define SNDRV_SEQ_OSS_MODE_MUSIC		1
+
+/* flag: event_passing */
+#define SNDRV_SEQ_OSS_PROCESS_EVENTS	0	/* key == 255 is processed as velocity change */
+#define SNDRV_SEQ_OSS_PASS_EVENTS		1	/* pass all events to callback */
+#define SNDRV_SEQ_OSS_PROCESS_KEYPRESS	2	/* key >= 128 will be processed as key-pressure */
+
+/* default control rate: fixed */
+#define SNDRV_SEQ_OSS_CTRLRATE		100
+
+/* default max queue length: configurable by module option */
+#define SNDRV_SEQ_OSS_MAX_QLEN		1024
+
+
+/*
+ * data pointer to snd_seq_register_device
+ */
+struct snd_seq_oss_reg {
+	int type;
+	int subtype;
+	int nvoices;
+	struct snd_seq_oss_callback oper;
+	void *private_data;
+};
+
+/* device id */
+#define SNDRV_SEQ_DEV_ID_OSS		"seq-oss"
+
+#endif /* __SOUND_SEQ_OSS_H */