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, 52 insertions, 0 deletions

diff --git a/sound/soc/tegra/Makefile b/sound/soc/tegra/Makefile
new file mode 100644
index 000000000..1c18ef697
--- /dev/null
+++ b/sound/soc/tegra/Makefile
@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: GPL-2.0
+# Tegra platform Support
+snd-soc-tegra-pcm-y := tegra_pcm.o
+snd-soc-tegra20-ac97-y := tegra20_ac97.o
+snd-soc-tegra20-das-y := tegra20_das.o
+snd-soc-tegra20-i2s-y := tegra20_i2s.o
+snd-soc-tegra20-spdif-y := tegra20_spdif.o
+snd-soc-tegra30-ahub-y := tegra30_ahub.o
+snd-soc-tegra30-i2s-y := tegra30_i2s.o
+snd-soc-tegra210-ahub-y := tegra210_ahub.o
+snd-soc-tegra210-dmic-y := tegra210_dmic.o
+snd-soc-tegra210-i2s-y := tegra210_i2s.o
+snd-soc-tegra186-asrc-y := tegra186_asrc.o
+snd-soc-tegra186-dspk-y := tegra186_dspk.o
+snd-soc-tegra210-admaif-y := tegra210_admaif.o tegra_isomgr_bw.o
+snd-soc-tegra210-mvc-y := tegra210_mvc.o
+snd-soc-tegra210-sfc-y := tegra210_sfc.o
+snd-soc-tegra210-amx-y := tegra210_amx.o
+snd-soc-tegra210-adx-y := tegra210_adx.o
+snd-soc-tegra210-mixer-y := tegra210_mixer.o
+snd-soc-tegra210-ope-y := tegra210_ope.o tegra210_mbdrc.o tegra210_peq.o
+
+obj-$(CONFIG_SND_SOC_TEGRA) += snd-soc-tegra-pcm.o
+obj-$(CONFIG_SND_SOC_TEGRA20_AC97) += snd-soc-tegra20-ac97.o
+obj-$(CONFIG_SND_SOC_TEGRA20_DAS) += snd-soc-tegra20-das.o
+obj-$(CONFIG_SND_SOC_TEGRA20_I2S) += snd-soc-tegra20-i2s.o
+obj-$(CONFIG_SND_SOC_TEGRA20_SPDIF) += snd-soc-tegra20-spdif.o
+obj-$(CONFIG_SND_SOC_TEGRA30_AHUB) += snd-soc-tegra30-ahub.o
+obj-$(CONFIG_SND_SOC_TEGRA30_I2S) += snd-soc-tegra30-i2s.o
+obj-$(CONFIG_SND_SOC_TEGRA210_DMIC) += snd-soc-tegra210-dmic.o
+obj-$(CONFIG_SND_SOC_TEGRA210_AHUB) += snd-soc-tegra210-ahub.o
+obj-$(CONFIG_SND_SOC_TEGRA210_I2S) += snd-soc-tegra210-i2s.o
+obj-$(CONFIG_SND_SOC_TEGRA186_ASRC) += snd-soc-tegra186-asrc.o
+obj-$(CONFIG_SND_SOC_TEGRA186_DSPK) += snd-soc-tegra186-dspk.o
+obj-$(CONFIG_SND_SOC_TEGRA210_ADMAIF) += snd-soc-tegra210-admaif.o
+obj-$(CONFIG_SND_SOC_TEGRA210_MVC) += snd-soc-tegra210-mvc.o
+obj-$(CONFIG_SND_SOC_TEGRA210_SFC) += snd-soc-tegra210-sfc.o
+obj-$(CONFIG_SND_SOC_TEGRA210_AMX) += snd-soc-tegra210-amx.o
+obj-$(CONFIG_SND_SOC_TEGRA210_ADX) += snd-soc-tegra210-adx.o
+obj-$(CONFIG_SND_SOC_TEGRA210_MIXER) += snd-soc-tegra210-mixer.o
+obj-$(CONFIG_SND_SOC_TEGRA210_OPE) += snd-soc-tegra210-ope.o
+
+# Tegra machine Support
+snd-soc-tegra-wm8903-y := tegra_wm8903.o
+snd-soc-tegra-wm8962-y := tegra_wm8962.o
+snd-soc-tegra-machine-y := tegra_asoc_machine.o
+snd-soc-tegra-audio-graph-card-y := tegra_audio_graph_card.o
+
+obj-$(CONFIG_SND_SOC_TEGRA_WM8903) += snd-soc-tegra-wm8903.o
+obj-$(CONFIG_SND_SOC_TEGRA_WM8962) += snd-soc-tegra-wm8962.o
+obj-$(CONFIG_SND_SOC_TEGRA_MACHINE_DRV) += snd-soc-tegra-machine.o
+obj-$(CONFIG_SND_SOC_TEGRA_AUDIO_GRAPH_CARD) += snd-soc-tegra-audio-graph-card.o