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, 42 insertions, 0 deletions

diff --git a/include/sound/rt5665.h b/include/sound/rt5665.h
new file mode 100644
index 000000000..e865f0419
--- /dev/null
+++ b/include/sound/rt5665.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * linux/sound/rt5665.h -- Platform data for RT5665
+ *
+ * Copyright 2016 Realtek Microelectronics
+ */
+
+#ifndef __LINUX_SND_RT5665_H
+#define __LINUX_SND_RT5665_H
+
+enum rt5665_dmic1_data_pin {
+	RT5665_DMIC1_NULL,
+	RT5665_DMIC1_DATA_GPIO4,
+	RT5665_DMIC1_DATA_IN2N,
+};
+
+enum rt5665_dmic2_data_pin {
+	RT5665_DMIC2_NULL,
+	RT5665_DMIC2_DATA_GPIO5,
+	RT5665_DMIC2_DATA_IN2P,
+};
+
+enum rt5665_jd_src {
+	RT5665_JD_NULL,
+	RT5665_JD1,
+};
+
+struct rt5665_platform_data {
+	bool in1_diff;
+	bool in2_diff;
+	bool in3_diff;
+	bool in4_diff;
+
+	enum rt5665_dmic1_data_pin dmic1_data_pin;
+	enum rt5665_dmic2_data_pin dmic2_data_pin;
+	enum rt5665_jd_src jd_src;
+
+	unsigned int sar_hs_type;
+};
+
+#endif
+