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, 58 insertions, 0 deletions

diff --git a/drivers/pmdomain/mediatek/Kconfig b/drivers/pmdomain/mediatek/Kconfig
new file mode 100644
index 000000000..8923e6516
--- /dev/null
+++ b/drivers/pmdomain/mediatek/Kconfig
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+menu "MediaTek PM Domains"
+	depends on ARCH_MEDIATEK || COMPILE_TEST
+
+config MTK_SCPSYS
+	bool "MediaTek SCPSYS Support"
+	default ARCH_MEDIATEK
+	depends on OF
+	select REGMAP
+	select MTK_INFRACFG
+	select PM_GENERIC_DOMAINS if PM
+	help
+	  Say yes here to add support for the MediaTek SCPSYS power domain
+	  driver.
+
+config MTK_SCPSYS_PM_DOMAINS
+	bool "MediaTek SCPSYS generic power domain"
+	default ARCH_MEDIATEK
+	depends on PM
+	select PM_GENERIC_DOMAINS
+	select REGMAP
+	help
+	  Say y here to enable power domain support.
+	  In order to meet high performance and low power requirements, the System
+	  Control Processor System (SCPSYS) has several power management related
+	  tasks in the system.
+
+config MTK_MFG_PM_DOMAIN
+	bool "MediaTek MFlexGraphics power domain"
+	default ARCH_MEDIATEK
+	depends on PM
+	depends on OF
+	depends on COMMON_CLK
+	select MAILBOX
+	select PM_GENERIC_DOMAINS
+	imply MTK_GPUEB_MBOX
+	help
+	  Say y or m here to enable the power domains driver for MediaTek
+	  MFlexGraphics. This driver allows for power and frequency control of
+	  GPUs on MediaTek SoCs such as the MT8196 or MT6991.
+
+	  This driver is required for the Mali GPU to work at all on MT8196 and
+	  MT6991.
+
+config AIROHA_CPU_PM_DOMAIN
+	tristate "Airoha CPU power domain"
+	default ARCH_AIROHA
+	depends on HAVE_ARM_SMCCC
+	depends on PM
+	select PM_GENERIC_DOMAINS
+	help
+	  Say y here to enable CPU power domain support for Airoha SoC.
+
+	  CPU frequency and power is controlled by ATF with SMC command to
+	  set performance states.
+
+endmenu