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/clk/sophgo/Kconfig b/drivers/clk/sophgo/Kconfig
new file mode 100644
index 000000000..e14e802f2
--- /dev/null
+++ b/drivers/clk/sophgo/Kconfig
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: GPL-2.0
+# common clock support for SOPHGO SoC family.
+
+config CLK_SOPHGO_CV1800
+	tristate "Support for the Sophgo CV1800 series SoCs clock controller"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	help
+	  This driver supports clock controller of Sophgo CV18XX series SoC.
+	  The driver require a 25MHz Oscillator to function generate clock.
+	  It includes PLLs, common clock function and some vendor clock for
+	  IPs of CV18XX series SoC
+
+config CLK_SOPHGO_SG2042_PLL
+	tristate "Sophgo SG2042 PLL clock support"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	help
+	  This driver supports the PLL clock controller on the
+	  Sophgo SG2042 SoC. This clock IP uses three oscillators with
+	  frequency of 25 MHz as input, which are used for Main/Fixed
+	  PLL, DDR PLL 0 and DDR PLL 1 respectively.
+
+config CLK_SOPHGO_SG2042_CLKGEN
+	tristate "Sophgo SG2042 Clock Generator support"
+	depends on CLK_SOPHGO_SG2042_PLL
+	help
+	  This driver supports the Clock Generator on the
+	  Sophgo SG2042 SoC. This clock IP depends on SG2042 PLL clock
+	  because it uses PLL clocks as input.
+	  This driver provides clock function such as DIV/Mux/Gate.
+
+config CLK_SOPHGO_SG2042_RPGATE
+	tristate "Sophgo SG2042 RP subsystem clock controller support"
+	depends on CLK_SOPHGO_SG2042_CLKGEN
+	help
+	  This driver supports the RP((Riscv Processors)) subsystem clock
+	  controller on the Sophgo SG2042 SoC.
+	  This clock IP depends on SG2042 Clock Generator because it uses
+	  clock from Clock Generator IP as input.
+	  This driver provides Gate function for RP.
+
+config CLK_SOPHGO_SG2044
+	tristate "Sophgo SG2044 clock controller support"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	help
+	  This driver supports the clock controller on the Sophgo SG2044
+	  SoC. This controller requires mulitple PLL clock as input.
+	  This clock control provides PLL clocks and common clock function
+	  for various IPs on the SoC.
+
+config CLK_SOPHGO_SG2044_PLL
+	tristate "Sophgo SG2044 PLL clock controller support"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	select MFD_SYSCON
+	select REGMAP_MMIO
+	help
+	  This driver supports the PLL clock controller on the Sophgo
+	  SG2044 SoC. This controller requires 25M oscillator as input.
+	  This clock control provides PLL clocks on the SoC.