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, 74 insertions, 0 deletions

diff --git a/drivers/clk/starfive/Kconfig b/drivers/clk/starfive/Kconfig
new file mode 100644
index 000000000..bd29358ff
--- /dev/null
+++ b/drivers/clk/starfive/Kconfig
@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config CLK_STARFIVE_JH71X0
+	bool
+
+config CLK_STARFIVE_JH7100
+	bool "StarFive JH7100 clock support"
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	select CLK_STARFIVE_JH71X0
+	default ARCH_STARFIVE
+	help
+	  Say yes here to support the clock controller on the StarFive JH7100
+	  SoC.
+
+config CLK_STARFIVE_JH7100_AUDIO
+	tristate "StarFive JH7100 audio clock support"
+	depends on CLK_STARFIVE_JH7100
+	select CLK_STARFIVE_JH71X0
+	default m if ARCH_STARFIVE
+	help
+	  Say Y or M here to support the audio clocks on the StarFive JH7100
+	  SoC.
+
+config CLK_STARFIVE_JH7110_PLL
+	bool "StarFive JH7110 PLL clock support"
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	default ARCH_STARFIVE
+	help
+	  Say yes here to support the PLL clock controller on the
+	  StarFive JH7110 SoC.
+
+config CLK_STARFIVE_JH7110_SYS
+	bool "StarFive JH7110 system clock support"
+	depends on ARCH_STARFIVE || COMPILE_TEST
+	select AUXILIARY_BUS
+	select CLK_STARFIVE_JH71X0
+	select RESET_STARFIVE_JH7110 if RESET_CONTROLLER
+	select CLK_STARFIVE_JH7110_PLL
+	default ARCH_STARFIVE
+	help
+	  Say yes here to support the system clock controller on the
+	  StarFive JH7110 SoC.
+
+config CLK_STARFIVE_JH7110_AON
+	tristate "StarFive JH7110 always-on clock support"
+	depends on CLK_STARFIVE_JH7110_SYS
+	default m if ARCH_STARFIVE
+	help
+	  Say yes here to support the always-on clock controller on the
+	  StarFive JH7110 SoC.
+
+config CLK_STARFIVE_JH7110_STG
+	tristate "StarFive JH7110 System-Top-Group clock support"
+	depends on CLK_STARFIVE_JH7110_SYS
+	default m if ARCH_STARFIVE
+	help
+	  Say yes here to support the System-Top-Group clock controller
+	  on the StarFive JH7110 SoC.
+
+config CLK_STARFIVE_JH7110_ISP
+	tristate "StarFive JH7110 Image-Signal-Process clock support"
+	depends on CLK_STARFIVE_JH7110_SYS && JH71XX_PMU
+	default m if ARCH_STARFIVE
+	help
+	  Say yes here to support the Image-Signal-Process clock controller
+	  on the StarFive JH7110 SoC.
+
+config CLK_STARFIVE_JH7110_VOUT
+	tristate "StarFive JH7110 Video-Output clock support"
+	depends on CLK_STARFIVE_JH7110_SYS && JH71XX_PMU
+	default m if ARCH_STARFIVE
+	help
+	  Say yes here to support the Video-Output clock controller
+	  on the StarFive JH7110 SoC.