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, 123 insertions, 0 deletions

diff --git a/sound/soc/codecs/da732x.h b/sound/soc/codecs/da732x.h
new file mode 100644
index 000000000..c2f784c3f
--- /dev/null
+++ b/sound/soc/codecs/da732x.h
@@ -0,0 +1,123 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * da732x.h -- Dialog DA732X ALSA SoC Audio Driver Header File
+ *
+ * Copyright (C) 2012 Dialog Semiconductor GmbH
+ *
+ * Author: Michal Hajduk <Michal.Hajduk@diasemi.com>
+ */
+
+#ifndef __DA732X_H_
+#define __DA732X_H_
+
+#include <sound/soc.h>
+
+/* General */
+#define	DA732X_U8_MASK			0xFF
+#define	DA732X_4BYTES			4
+#define	DA732X_3BYTES			3
+#define	DA732X_2BYTES			2
+#define	DA732X_1BYTE			1
+#define	DA732X_1BYTE_SHIFT		8
+#define	DA732X_2BYTES_SHIFT		16
+#define	DA732X_3BYTES_SHIFT		24
+#define	DA732X_4BYTES_SHIFT		32
+
+#define	DA732X_DACS_DIS			0x0
+#define	DA732X_HP_DIS			0x0
+#define	DA732X_CLEAR_REG		0x0
+
+/* Calibration */
+#define	DA732X_DAC_OFFSET_STEP		0x20
+#define	DA732X_OUTPUT_OFFSET_STEP	0x80
+#define	DA732X_HP_OUT_TRIM_VAL		0x0
+#define	DA732X_WAIT_FOR_STABILIZATION	1
+#define	DA732X_HPL_DAC			0
+#define	DA732X_HPR_DAC			1
+#define	DA732X_HP_DACS			2
+#define	DA732X_HPL_AMP			0
+#define	DA732X_HPR_AMP			1
+#define	DA732X_HP_AMPS			2
+
+/* Clock settings */
+#define DA732X_STARTUP_DELAY		100
+#define	DA732X_PLL_OUT_196608		196608000
+#define	DA732X_PLL_OUT_180634		180633600
+#define	DA732X_PLL_OUT_SRM		188620800
+#define	DA732X_MCLK_10MHZ		10000000
+#define	DA732X_MCLK_20MHZ		20000000
+#define	DA732X_MCLK_40MHZ		40000000
+#define	DA732X_MCLK_54MHZ		54000000
+#define	DA732X_MCLK_VAL_0_10MHZ		0
+#define	DA732X_MCLK_VAL_10_20MHZ	1
+#define	DA732X_MCLK_VAL_20_40MHZ	2
+#define	DA732X_MCLK_VAL_40_54MHZ	3
+#define	DA732X_DAI_ID1			0
+#define	DA732X_DAI_ID2			1
+#define	DA732X_SRCCLK_PLL		0
+#define	DA732X_SRCCLK_MCLK		1
+
+#define	DA732X_LIN_LP_VOL		0x4F
+#define	DA732X_LP_VOL			0x40
+
+/* Kcontrols */
+#define	DA732X_DAC_EN_MAX		2
+#define	DA732X_ADCL_MUX_MAX		2
+#define	DA732X_ADCR_MUX_MAX		3
+#define	DA732X_HPF_MODE_MAX		3
+#define	DA732X_HPF_MODE_SHIFT		4
+#define	DA732X_HPF_MUSIC_SHIFT		0
+#define	DA732X_HPF_MUSIC_MAX		4
+#define	DA732X_HPF_VOICE_SHIFT		4
+#define	DA732X_HPF_VOICE_MAX		8
+#define	DA732X_EQ_EN_MAX		1
+#define	DA732X_HPF_VOICE		1
+#define	DA732X_HPF_MUSIC		2
+#define	DA732X_HPF_DISABLED		0
+#define	DA732X_NO_INVERT		0
+#define	DA732X_INVERT			1
+#define	DA732X_SWITCH_MAX		1
+#define	DA732X_ENABLE_CP		1
+#define	DA732X_DISABLE_CP		0
+#define	DA732X_DISABLE_ALL_CLKS		0
+#define	DA732X_RESET_ADCS		0
+
+/* dB values */
+#define DA732X_MIC_VOL_DB_MIN		0
+#define DA732X_MIC_VOL_DB_INC		50
+#define DA732X_MIC_PRE_VOL_DB_MIN	0
+#define DA732X_MIC_PRE_VOL_DB_INC	600
+#define DA732X_AUX_VOL_DB_MIN		-6000
+#define DA732X_AUX_VOL_DB_INC		150
+#define DA732X_HP_VOL_DB_MIN		-2250
+#define DA732X_HP_VOL_DB_INC		150
+#define	DA732X_LIN2_VOL_DB_MIN		-1650
+#define	DA732X_LIN2_VOL_DB_INC		150
+#define	DA732X_LIN3_VOL_DB_MIN		-1650
+#define DA732X_LIN3_VOL_DB_INC		150
+#define	DA732X_LIN4_VOL_DB_MIN		-2250
+#define DA732X_LIN4_VOL_DB_INC		150
+#define	DA732X_EQ_BAND_VOL_DB_MIN	-1050
+#define	DA732X_EQ_BAND_VOL_DB_INC	150
+#define DA732X_DAC_VOL_DB_MIN		-7725
+#define DA732X_DAC_VOL_DB_INC		75
+#define DA732X_ADC_VOL_DB_MIN		0
+#define DA732X_ADC_VOL_DB_INC		-1
+#define	DA732X_EQ_OVERALL_VOL_DB_MIN	-1800
+#define	DA732X_EQ_OVERALL_VOL_DB_INC	600
+
+enum da732x_sysctl {
+	DA732X_SR_8KHZ		= 0x1,
+	DA732X_SR_11_025KHZ	= 0x2,
+	DA732X_SR_12KHZ		= 0x3,
+	DA732X_SR_16KHZ		= 0x5,
+	DA732X_SR_22_05KHZ	= 0x6,
+	DA732X_SR_24KHZ		= 0x7,
+	DA732X_SR_32KHZ		= 0x9,
+	DA732X_SR_44_1KHZ	= 0xA,
+	DA732X_SR_48KHZ		= 0xB,
+	DA732X_SR_88_1KHZ	= 0xE,
+	DA732X_SR_96KHZ		= 0xF,
+};
+
+#endif /* __DA732X_H_ */