From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock 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 Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- Documentation/gpu/intel-display/dmc.rst | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 Documentation/gpu/intel-display/dmc.rst (limited to 'Documentation/gpu/intel-display/dmc.rst') diff --git a/Documentation/gpu/intel-display/dmc.rst b/Documentation/gpu/intel-display/dmc.rst new file mode 100644 index 000000000..4368da4c7 --- /dev/null +++ b/Documentation/gpu/intel-display/dmc.rst @@ -0,0 +1,26 @@ +.. SPDX-License-Identifier: MIT +.. Copyright © 2026 Intel Corporation + +.. _drm/intel-display/dmc: + +DMC Firmware Support +==================== + +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dmc.c + :doc: DMC Firmware Support + +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dmc.c + :internal: + + +DMC Flip Queue +============== + +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_flipq.c + :doc: DMC Flip Queue + +DMC wakelock support +==================== + +.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dmc_wl.c + :doc: DMC wakelock support -- cgit v1.3.1