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, 96 insertions, 0 deletions

diff --git a/drivers/clk/ingenic/Kconfig b/drivers/clk/ingenic/Kconfig
new file mode 100644
index 000000000..f80ac4f29
--- /dev/null
+++ b/drivers/clk/ingenic/Kconfig
@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "Ingenic SoCs drivers"
+	depends on MIPS || COMPILE_TEST
+
+config INGENIC_CGU_COMMON
+	bool
+
+config INGENIC_CGU_JZ4740
+	bool "Ingenic JZ4740 CGU driver"
+	default MACH_JZ4740
+	select INGENIC_CGU_COMMON
+	help
+	  Support the clocks provided by the CGU hardware on Ingenic JZ4740
+	  and compatible SoCs.
+
+	  If building for a JZ4740 SoC, you want to say Y here.
+
+config INGENIC_CGU_JZ4755
+	bool "Ingenic JZ4755 CGU driver"
+	default MACH_JZ4755
+	select INGENIC_CGU_COMMON
+	help
+	  Support the clocks provided by the CGU hardware on Ingenic JZ4755
+	  and compatible SoCs.
+
+	  If building for a JZ4755 SoC, you want to say Y here.
+
+config INGENIC_CGU_JZ4725B
+	bool "Ingenic JZ4725B CGU driver"
+	default MACH_JZ4725B
+	select INGENIC_CGU_COMMON
+	help
+	  Support the clocks provided by the CGU hardware on Ingenic JZ4725B
+	  and compatible SoCs.
+
+	  If building for a JZ4725B SoC, you want to say Y here.
+
+config INGENIC_CGU_JZ4760
+	bool "Ingenic JZ4760 CGU driver"
+	default MACH_JZ4760
+	select INGENIC_CGU_COMMON
+	help
+	  Support the clocks provided by the CGU hardware on Ingenic JZ4760
+	  and compatible SoCs.
+
+	  If building for a JZ4760 SoC, you want to say Y here.
+
+config INGENIC_CGU_JZ4770
+	bool "Ingenic JZ4770 CGU driver"
+	default MACH_JZ4770
+	select INGENIC_CGU_COMMON
+	help
+	  Support the clocks provided by the CGU hardware on Ingenic JZ4770
+	  and compatible SoCs.
+
+	  If building for a JZ4770 SoC, you want to say Y here.
+
+config INGENIC_CGU_JZ4780
+	bool "Ingenic JZ4780 CGU driver"
+	default MACH_JZ4780
+	select INGENIC_CGU_COMMON
+	help
+	  Support the clocks provided by the CGU hardware on Ingenic JZ4780
+	  and compatible SoCs.
+
+	  If building for a JZ4780 SoC, you want to say Y here.
+
+config INGENIC_CGU_X1000
+	bool "Ingenic X1000 CGU driver"
+	default MACH_X1000
+	select INGENIC_CGU_COMMON
+	help
+	  Support the clocks provided by the CGU hardware on Ingenic X1000
+	  and compatible SoCs.
+
+	  If building for a X1000 SoC, you want to say Y here.
+
+config INGENIC_CGU_X1830
+	bool "Ingenic X1830 CGU driver"
+	default MACH_X1830
+	select INGENIC_CGU_COMMON
+	help
+	  Support the clocks provided by the CGU hardware on Ingenic X1830
+	  and compatible SoCs.
+
+	  If building for a X1830 SoC, you want to say Y here.
+
+config INGENIC_TCU_CLK
+	bool "Ingenic JZ47xx TCU clocks driver"
+	default MACH_INGENIC
+	select MFD_SYSCON
+	help
+	  Support the clocks of the Timer/Counter Unit (TCU) of the Ingenic
+	  JZ47xx SoCs.
+
+endmenu