ftrace: Synchronize the initialization of ftrace_opsgrafted

There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.

Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.

Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

22 files changed, 295 insertions, 0 deletions

diff --git a/Documentation/gpu/intel-display/async-flip.rst b/Documentation/gpu/intel-display/async-flip.rst
new file mode 100644
index 000000000..40f93e885
--- /dev/null
+++ b/Documentation/gpu/intel-display/async-flip.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Asynchronous Page Flip
+======================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_display.c
+   :doc: asynchronous flip implementation
diff --git a/Documentation/gpu/intel-display/atomic.rst b/Documentation/gpu/intel-display/atomic.rst
new file mode 100644
index 000000000..43a473181
--- /dev/null
+++ b/Documentation/gpu/intel-display/atomic.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Atomic Modeset Support
+======================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_atomic.c
+   :doc: atomic modeset support
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_atomic.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/audio.rst b/Documentation/gpu/intel-display/audio.rst
new file mode 100644
index 000000000..eef95df75
--- /dev/null
+++ b/Documentation/gpu/intel-display/audio.rst
@@ -0,0 +1,23 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+High Definition Audio
+=====================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_audio.c
+   :doc: High Definition Audio over HDMI and Display Port
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_audio.c
+   :internal:
+
+.. kernel-doc:: include/drm/intel/i915_component.h
+   :internal:
+
+Intel HDMI LPE Audio Support
+============================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_lpe_audio.c
+   :doc: LPE Audio integration for HDMI or DP playback
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_lpe_audio.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/casf.rst b/Documentation/gpu/intel-display/casf.rst
new file mode 100644
index 000000000..406778ccd
--- /dev/null
+++ b/Documentation/gpu/intel-display/casf.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Content Adaptive Sharpness Filter (CASF)
+========================================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_casf.c
+   :doc: Content Adaptive Sharpness Filter (CASF)
diff --git a/Documentation/gpu/intel-display/cdclk.rst b/Documentation/gpu/intel-display/cdclk.rst
new file mode 100644
index 000000000..a66d623b0
--- /dev/null
+++ b/Documentation/gpu/intel-display/cdclk.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Display clocks
+==============
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_cdclk.c
+   :doc: CDCLK / RAWCLK
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_cdclk.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/cmtg.rst b/Documentation/gpu/intel-display/cmtg.rst
new file mode 100644
index 000000000..04edd0bd1
--- /dev/null
+++ b/Documentation/gpu/intel-display/cmtg.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Common Primary Timing Generator (CMTG)
+======================================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_cmtg.c
+   :doc: Common Primary Timing Generator (CMTG)
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
diff --git a/Documentation/gpu/intel-display/dp-link-capabilities.rst b/Documentation/gpu/intel-display/dp-link-capabilities.rst
new file mode 100644
index 000000000..331cc69d1
--- /dev/null
+++ b/Documentation/gpu/intel-display/dp-link-capabilities.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+DisplayPort Link Capabilities
+=============================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp_link_caps.c
+   :doc: DisplayPort link capabilities
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp_link_caps.h
+   :internal:
diff --git a/Documentation/gpu/intel-display/dp-link-training.rst b/Documentation/gpu/intel-display/dp-link-training.rst
new file mode 100644
index 000000000..d0bde9650
--- /dev/null
+++ b/Documentation/gpu/intel-display/dp-link-training.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+DisplayPort Link Training
+=========================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dp_link_training.c
+   :doc: DisplayPort link training
diff --git a/Documentation/gpu/intel-display/dpio.rst b/Documentation/gpu/intel-display/dpio.rst
new file mode 100644
index 000000000..84d92ac16
--- /dev/null
+++ b/Documentation/gpu/intel-display/dpio.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+DPIO
+====
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpio_phy.c
+   :doc: DPIO
diff --git a/Documentation/gpu/intel-display/dpll.rst b/Documentation/gpu/intel-display/dpll.rst
new file mode 100644
index 000000000..c750352e0
--- /dev/null
+++ b/Documentation/gpu/intel-display/dpll.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Display PLLs
+============
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+   :doc: Display PLLs
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dpll_mgr.h
+   :internal:
diff --git a/Documentation/gpu/intel-display/drrs.rst b/Documentation/gpu/intel-display/drrs.rst
new file mode 100644
index 000000000..a5aaba63d
--- /dev/null
+++ b/Documentation/gpu/intel-display/drrs.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Display Refresh Rate Switching (DRRS)
+=====================================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
+   :doc: Display Refresh Rate Switching (DRRS)
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_drrs.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/dsb.rst b/Documentation/gpu/intel-display/dsb.rst
new file mode 100644
index 000000000..857aca599
--- /dev/null
+++ b/Documentation/gpu/intel-display/dsb.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Display State Buffer
+====================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dsb.c
+   :doc: DSB
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_dsb.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/fbc.rst b/Documentation/gpu/intel-display/fbc.rst
new file mode 100644
index 000000000..de9e19021
--- /dev/null
+++ b/Documentation/gpu/intel-display/fbc.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Frame Buffer Compression (FBC)
+==============================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_fbc.c
+   :doc: Frame Buffer Compression (FBC)
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_fbc.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/fifo-underrun.rst b/Documentation/gpu/intel-display/fifo-underrun.rst
new file mode 100644
index 000000000..5d8f01921
--- /dev/null
+++ b/Documentation/gpu/intel-display/fifo-underrun.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Display FIFO Underrun Reporting
+===============================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_fifo_underrun.c
+   :doc: fifo underrun handling
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_fifo_underrun.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/frontbuffer.rst b/Documentation/gpu/intel-display/frontbuffer.rst
new file mode 100644
index 000000000..7ae38e082
--- /dev/null
+++ b/Documentation/gpu/intel-display/frontbuffer.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Frontbuffer Tracking
+====================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_frontbuffer.c
+   :doc: frontbuffer tracking
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_frontbuffer.h
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_frontbuffer.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/hotplug.rst b/Documentation/gpu/intel-display/hotplug.rst
new file mode 100644
index 000000000..f33bc0087
--- /dev/null
+++ b/Documentation/gpu/intel-display/hotplug.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Hotplug
+=======
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_hotplug.c
+   :doc: Hotplug
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_hotplug.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/index.rst b/Documentation/gpu/intel-display/index.rst
new file mode 100644
index 000000000..e81f49bf2
--- /dev/null
+++ b/Documentation/gpu/intel-display/index.rst
@@ -0,0 +1,46 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+.. _drm/intel-display:
+
+====================
+Intel Display Driver
+====================
+
+The Intel display driver provides the display, or :ref:`drm-kms`, support for
+both the :ref:`drm/xe <drm/xe>` and :ref:`drm/i915 <drm/i915>` Intel GPU
+drivers.
+
+The source code currently resides under ``drivers/gpu/drm/i915/display`` due to
+historical reasons, and it's compiled separately into both drm/xe and drm/i915
+kernel modules.
+
+The drm/xe and drm/i915 drivers are the "core" or "parent" drivers for display,
+as they initialize and own the drm device, and pass that on to the display
+driver. The display driver isn't an independent driver in that sense.
+
+.. toctree::
+   :maxdepth: 1
+   :caption: Detailed display topics
+
+   async-flip
+   atomic
+   audio
+   casf
+   cdclk
+   cmtg
+   dmc
+   dpio
+   dpll
+   drrs
+   dsb
+   fbc
+   fifo-underrun
+   frontbuffer
+   hotplug
+   dp-link-training
+   dp-link-capabilities
+   plane
+   psr
+   snps-phy
+   vbt
diff --git a/Documentation/gpu/intel-display/plane.rst b/Documentation/gpu/intel-display/plane.rst
new file mode 100644
index 000000000..59932a820
--- /dev/null
+++ b/Documentation/gpu/intel-display/plane.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Atomic Plane Helpers
+====================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_plane.c
+   :doc: atomic plane helpers
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_plane.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/psr.rst b/Documentation/gpu/intel-display/psr.rst
new file mode 100644
index 000000000..63e56abcd
--- /dev/null
+++ b/Documentation/gpu/intel-display/psr.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Panel Self Refresh PSR (PSR/SRD)
+================================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_psr.c
+   :doc: Panel Self Refresh (PSR/SRD)
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_psr.c
+   :internal:
diff --git a/Documentation/gpu/intel-display/snps-phy.rst b/Documentation/gpu/intel-display/snps-phy.rst
new file mode 100644
index 000000000..c9e333fa7
--- /dev/null
+++ b/Documentation/gpu/intel-display/snps-phy.rst
@@ -0,0 +1,8 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Synopsis PHY support
+====================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_snps_phy.c
+   :doc: Synopsis PHY support
diff --git a/Documentation/gpu/intel-display/vbt.rst b/Documentation/gpu/intel-display/vbt.rst
new file mode 100644
index 000000000..be69f7fd7
--- /dev/null
+++ b/Documentation/gpu/intel-display/vbt.rst
@@ -0,0 +1,14 @@
+.. SPDX-License-Identifier: MIT
+.. Copyright © 2026 Intel Corporation
+
+Video BIOS Table (VBT)
+======================
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_bios.c
+   :doc: Video BIOS Table (VBT)
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_bios.c
+   :internal:
+
+.. kernel-doc:: drivers/gpu/drm/i915/display/intel_vbt_defs.h
+   :internal: