selftests/bpf: Reject graph kptr use after RCU unlockgrafted

Add a sleepable verifier test that loads a graph-node local kptr in an
explicit RCU read-side critical section, then passes its node to
bpf_rbtree_remove() after the section ends.

Before the verifier fix, the stale NON_OWN_REF flag makes the node look like
a live borrowed reference and the program is accepted. After the fix, the
pointer is demoted without NON_OWN_REF and the graph kfunc argument is
rejected.

Also exercise a graph kptr loaded while a spin lock provides implicit RCU
protection. The pointer must be invalidated when the lock is released, which
guards the required ordering between non-owning-reference invalidation and
RCU demotion.

Update the existing fault-protected load test state description. The
post-unlock pointer no longer carries NON_OWN_REF, but remains readable
because the load is rewritten to use BPF_PROBE_MEM.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 61 insertions, 0 deletions

diff --git a/include/sound/max98095.h b/include/sound/max98095.h
new file mode 100644
index 000000000..731c88551
--- /dev/null
+++ b/include/sound/max98095.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Platform data for MAX98095
+ *
+ * Copyright 2011 Maxim Integrated Products
+ */
+
+#ifndef __SOUND_MAX98095_PDATA_H__
+#define __SOUND_MAX98095_PDATA_H__
+
+/* Equalizer filter response configuration */
+struct max98095_eq_cfg {
+	const char *name;
+	unsigned int rate;
+	u16 band1[5];
+	u16 band2[5];
+	u16 band3[5];
+	u16 band4[5];
+	u16 band5[5];
+};
+
+/* Biquad filter response configuration */
+struct max98095_biquad_cfg {
+	const char *name;
+	unsigned int rate;
+	u16 band1[5];
+	u16 band2[5];
+};
+
+/* codec platform data */
+struct max98095_pdata {
+
+	/* Equalizers for DAI1 and DAI2 */
+	struct max98095_eq_cfg *eq_cfg;
+	unsigned int eq_cfgcnt;
+
+	/* Biquad filter for DAI1 and DAI2 */
+	struct max98095_biquad_cfg *bq_cfg;
+	unsigned int bq_cfgcnt;
+
+	/* Analog/digital microphone configuration:
+	 * 0 = analog microphone input (normal setting)
+	 * 1 = digital microphone input
+	 */
+	unsigned int digmic_left_mode:1;
+	unsigned int digmic_right_mode:1;
+
+	/* Pin5 is the mechanical method of sensing jack insertion
+	 * but it is something that might not be supported.
+	 * 0 = PIN5 not supported
+	 * 1 = PIN5 supported
+	 */
+	unsigned int jack_detect_pin5en:1;
+
+	/* Slew amount for jack detection. Calculated as 4 * (delay + 1).
+	 * Default delay is 24 to get a time of 100ms.
+	 */
+	unsigned int jack_detect_delay;
+};
+
+#endif