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, 30 insertions, 0 deletions

diff --git a/sound/soc/codecs/twl6040.h b/sound/soc/codecs/twl6040.h
new file mode 100644
index 000000000..f4f4b14cc
--- /dev/null
+++ b/sound/soc/codecs/twl6040.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * ALSA SoC TWL6040 codec driver
+ *
+ * Author:	Misael Lopez Cruz <x0052729@ti.com>
+ */
+
+#ifndef __TWL6040_H__
+#define __TWL6040_H__
+
+enum twl6040_trim {
+	TWL6040_TRIM_TRIM1 = 0,
+	TWL6040_TRIM_TRIM2,
+	TWL6040_TRIM_TRIM3,
+	TWL6040_TRIM_HSOTRIM,
+	TWL6040_TRIM_HFOTRIM,
+	TWL6040_TRIM_INVAL,
+};
+
+#define TWL6040_HSF_TRIM_LEFT(x)	(x & 0x0f)
+#define TWL6040_HSF_TRIM_RIGHT(x)	((x >> 4) & 0x0f)
+
+int twl6040_get_dl1_gain(struct snd_soc_component *component);
+void twl6040_hs_jack_detect(struct snd_soc_component *component,
+			    struct snd_soc_jack *jack, int report);
+int twl6040_get_clk_id(struct snd_soc_component *component);
+int twl6040_get_trim_value(struct snd_soc_component *component, enum twl6040_trim trim);
+int twl6040_get_hs_step_size(struct snd_soc_component *component);
+
+#endif /* End of __TWL6040_H__ */