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, 35 insertions, 0 deletions

diff --git a/sound/mips/Kconfig b/sound/mips/Kconfig
new file mode 100644
index 000000000..c484b1e42
--- /dev/null
+++ b/sound/mips/Kconfig
@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# ALSA MIPS drivers
+
+menuconfig SND_MIPS
+	bool "MIPS sound devices"
+	depends on MIPS
+	default y
+	help
+	  Support for sound devices of MIPS architectures.
+
+if SND_MIPS
+
+config SND_SGI_O2
+	tristate "SGI O2 Audio"
+	depends on SGI_IP32
+	select SND_PCM
+	help
+	  Sound support for the SGI O2 Workstation.
+
+config SND_SGI_HAL2
+	tristate "SGI HAL2 Audio"
+	depends on SGI_HAS_HAL2
+	select SND_PCM
+	help
+	  Sound support for the SGI Indy and Indigo2 Workstation.
+
+config SND_N64
+	bool "N64 Audio"
+	depends on MACH_NINTENDO64 && SND=y
+	select SND_PCM
+	help
+	  Sound support for the N64.
+
+endif	# SND_MIPS
+