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, 53 insertions, 0 deletions

diff --git a/sound/ppc/Kconfig b/sound/ppc/Kconfig
new file mode 100644
index 000000000..8789cb503
--- /dev/null
+++ b/sound/ppc/Kconfig
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# ALSA PowerMac drivers
+
+menuconfig SND_PPC
+	bool "PowerPC sound devices"
+	depends on PPC
+	default y
+	help
+	  Support for sound devices specific to PowerPC architectures.
+
+if SND_PPC
+
+config SND_POWERMAC
+	tristate "PowerMac (AWACS, DACA, Burgundy, Tumbler, Keywest)"
+	depends on I2C && INPUT && PPC_PMAC
+	select SND_PCM
+	select SND_VMASTER
+	help
+	  Say Y here to include support for the integrated sound device.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd-powermac.
+
+config SND_POWERMAC_AUTO_DRC
+	bool "Toggle DRC automatically at headphone/line plug-in"
+	depends on SND_POWERMAC
+	default y
+	help
+	  Say Y here to enable the automatic toggle of DRC (dynamic
+	  range compression) on Tumbler/Snapper.
+	  If this feature is enabled, DRC is turned off when the
+	  headphone/line jack is plugged, and turned on when unplugged.
+
+	  Note that you can turn on/off DRC manually even without this
+	  option.
+
+config SND_PS3
+	tristate "PS3 Audio support"
+	depends on PS3_PS3AV
+	select SND_PCM
+	default m
+	help
+	  Say Y here to include support for audio on the PS3
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called snd_ps3.
+
+config SND_PS3_DEFAULT_START_DELAY
+	int "Startup delay time in ms"
+	depends on SND_PS3
+	default "2000"
+
+endif	# SND_PPC