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, 96 insertions, 0 deletions

diff --git a/sound/soc/codecs/pcm3060.h b/sound/soc/codecs/pcm3060.h
new file mode 100644
index 000000000..1b9683560
--- /dev/null
+++ b/sound/soc/codecs/pcm3060.h
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * PCM3060 codec driver
+ *
+ * Copyright (C) 2018 Kirill Marinushkin <k.marinushkin@gmail.com>
+ */
+
+#ifndef _SND_SOC_PCM3060_H
+#define _SND_SOC_PCM3060_H
+
+#include <linux/device.h>
+#include <linux/regmap.h>
+
+extern const struct regmap_config pcm3060_regmap;
+
+#define PCM3060_DAI_ID_DAC	0
+#define PCM3060_DAI_ID_ADC	1
+#define PCM3060_DAI_IDS_NUM	2
+
+/* ADC and DAC can be clocked from separate or same sources CLK1 and CLK2 */
+#define PCM3060_CLK_DEF	0 /* default: CLK1->ADC, CLK2->DAC */
+#define PCM3060_CLK1		1
+#define PCM3060_CLK2		2
+
+struct pcm3060_priv_dai {
+	bool is_provider;
+	unsigned int sclk_freq;
+};
+
+struct pcm3060_priv {
+	struct regmap *regmap;
+	struct pcm3060_priv_dai dai[PCM3060_DAI_IDS_NUM];
+	u8 out_se: 1;
+};
+
+int pcm3060_probe(struct device *dev);
+int pcm3060_remove(struct device *dev);
+
+/* registers */
+
+#define PCM3060_REG64			0x40
+#define PCM3060_REG_MRST		0x80
+#define PCM3060_REG_SRST		0x40
+#define PCM3060_REG_ADPSV		0x20
+#define PCM3060_REG_SHIFT_ADPSV	0x05
+#define PCM3060_REG_DAPSV		0x10
+#define PCM3060_REG_SHIFT_DAPSV	0x04
+#define PCM3060_REG_SE			0x01
+
+#define PCM3060_REG65			0x41
+#define PCM3060_REG66			0x42
+#define PCM3060_REG_AT2_MIN		0x36
+#define PCM3060_REG_AT2_MAX		0xFF
+
+#define PCM3060_REG67			0x43
+#define PCM3060_REG72			0x48
+#define PCM3060_REG_CSEL		0x80
+#define PCM3060_REG_MASK_MS		0x70
+#define PCM3060_REG_MS_S		0x00
+#define PCM3060_REG_MS_M768		(0x01 << 4)
+#define PCM3060_REG_MS_M512		(0x02 << 4)
+#define PCM3060_REG_MS_M384		(0x03 << 4)
+#define PCM3060_REG_MS_M256		(0x04 << 4)
+#define PCM3060_REG_MS_M192		(0x05 << 4)
+#define PCM3060_REG_MS_M128		(0x06 << 4)
+#define PCM3060_REG_MASK_FMT		0x03
+#define PCM3060_REG_FMT_I2S		0x00
+#define PCM3060_REG_FMT_LJ		0x01
+#define PCM3060_REG_FMT_RJ		0x02
+
+#define PCM3060_REG68			0x44
+#define PCM3060_REG_OVER		0x40
+#define PCM3060_REG_DREV2		0x04
+#define PCM3060_REG_SHIFT_MUT21	0x00
+#define PCM3060_REG_SHIFT_MUT22	0x01
+
+#define PCM3060_REG69			0x45
+#define PCM3060_REG_FLT		0x80
+#define PCM3060_REG_MASK_DMF		0x60
+#define PCM3060_REG_DMC		0x10
+#define PCM3060_REG_ZREV		0x02
+#define PCM3060_REG_AZRO		0x01
+
+#define PCM3060_REG70			0x46
+#define PCM3060_REG71			0x47
+#define PCM3060_REG_AT1_MIN		0x0E
+#define PCM3060_REG_AT1_MAX		0xFF
+
+#define PCM3060_REG73			0x49
+#define PCM3060_REG_ZCDD		0x10
+#define PCM3060_REG_BYP		0x08
+#define PCM3060_REG_DREV1		0x04
+#define PCM3060_REG_SHIFT_MUT11	0x00
+#define PCM3060_REG_SHIFT_MUT12	0x01
+
+#endif /* _SND_SOC_PCM3060_H */