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, 21 insertions, 0 deletions

diff --git a/sound/parisc/Kconfig b/sound/parisc/Kconfig
new file mode 100644
index 000000000..425ceaf9c
--- /dev/null
+++ b/sound/parisc/Kconfig
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# ALSA PA-RISC drivers
+
+menuconfig SND_GSC
+	bool "GSC sound devices"
+	depends on GSC
+	default y
+	help
+	  Support for GSC sound devices on PA-RISC architectures.
+
+if SND_GSC
+
+config SND_HARMONY
+	tristate "Harmony/Vivace sound chip"
+	select SND_PCM
+	help
+	  Say 'Y' or 'M' to include support for the Harmony/Vivace sound
+	  chip found in most GSC-based PA-RISC workstations.  It's frequently
+	  provided as part of the Lasi multi-function IC.
+
+endif	# SND_GSC