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, 47 insertions, 0 deletions

diff --git a/include/sound/cs48l32.h b/include/sound/cs48l32.h
new file mode 100644
index 000000000..27b3e7cf9
--- /dev/null
+++ b/include/sound/cs48l32.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Register definitions for Cirrus Logic CS48L32
+ *
+ * Copyright (C) 2017-2018, 2020, 2022, 2025 Cirrus Logic, Inc. and
+ *               Cirrus Logic International Semiconductor Ltd.
+ */
+
+#ifndef CS48L32_H
+#define CS48L32_H
+
+/* pll_id for snd_soc_component_set_pll() */
+#define CS48L32_FLL1_REFCLK			1
+
+/* source for snd_soc_component_set_pll() */
+#define CS48L32_FLL_SRC_NONE			-1
+#define CS48L32_FLL_SRC_MCLK1			0
+#define CS48L32_FLL_SRC_PDMCLK			5
+#define CS48L32_FLL_SRC_ASP1_BCLK		8
+#define CS48L32_FLL_SRC_ASP2_BCLK		9
+#define CS48L32_FLL_SRC_ASP1_FSYNC		12
+#define CS48L32_FLL_SRC_ASP2_FSYNC		13
+
+/* clk_id for snd_soc_component_set_sysclk() and snd_soc_dai_set_sysclk() */
+#define CS48L32_CLK_SYSCLK_1			1
+#define CS48L32_CLK_SYSCLK_2			2
+#define CS48L32_CLK_SYSCLK_3			3
+#define CS48L32_CLK_SYSCLK_4			4
+#define CS48L32_CLK_DSPCLK			7
+#define CS48L32_CLK_PDM_FLLCLK			13
+
+/* source for snd_soc_component_set_sysclk() */
+#define CS48L32_CLK_SRC_MCLK1			0x0
+#define CS48L32_CLK_SRC_FLL1			0x4
+#define CS48L32_CLK_SRC_ASP1_BCLK		0x8
+#define CS48L32_CLK_SRC_ASP2_BCLK		0x9
+
+struct cs48l32 {
+	struct regmap *regmap;
+	struct device *dev;
+	struct gpio_desc *reset_gpio;
+	struct clk *mclk1;
+	struct regulator_bulk_data core_supplies[2];
+	struct regulator *vdd_d;
+	int irq;
+};
+#endif