Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEADgrafted

Changes:

Make expedited grace periods expedite normal RCU callbacks

Miscellaneous fixes:
 * Improve diagnostic output with character task states.
 * Mark accesses to inform KCSAN of concurrency design.
 * Move from kmalloc() to kmalloc_obj().
 * Documentation updates.
 * Improve handling of RCU deferred quiescent states.
 * Clean up unused function arguments and structure fields.
 * Reduce show_rcu_gp_kthreads() stack space.

Tasks RCU updates:
 * Clean up after SRCU re-implementation of Tasks Trace RCU.
 * Mark accesses to inform KCSAN of concurrency design.
 * Add ->lazy_timer status to diagnostic output.
 * Remove an unnecessary memory barrier.
 * Fix a data race, courtesy of KCSAN.
 * Documentation updates.
 * Convert cond_resched_tasks_rcu_qs() from macro to static inline
   function.

SRCU updates:
 * Add Rust helpers for SRCU.
 * Avoid losing queued work at cleanup_srcu_struct() time.

Torture-test updates:
 * Preparation work for immediate RCU priority deboosting.
 * Test RCU readers from real interrupt handlers (as opposed to softirq).
 * Simplify code through use of cpumask_next_wrap().
 * Improve diagnostic output with character task states.
 * Add rcutorture.nwriters parameter to allow lightweight stall testing,
   and rcutorture.stall_only to make doing so easier.
 * Test an RCU Tasks Trace grace period implying an RCU grace period.
 * Make RCU Tasks Trace torturing track reader batches.
 * Fix a data race, courtesy of KCSAN.
 * Plug a shuffle_tmp_mask memory leak on kthread spawn failure.

16 files changed, 190 insertions, 0 deletions

diff --git a/Documentation/dev-tools/lkmm/docs/access-marking.rst b/Documentation/dev-tools/lkmm/docs/access-marking.rst
new file mode 100644
index 000000000..80058a4da
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/access-marking.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Access Marking
+--------------
+
+Literal include of ``tools/memory-model/Documentation/access-marking.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/access-marking.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/cheatsheet.rst b/Documentation/dev-tools/lkmm/docs/cheatsheet.rst
new file mode 100644
index 000000000..37681f6a6
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/cheatsheet.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Cheatsheet
+----------
+
+Literal include of ``tools/memory-model/Documentation/cheatsheet.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/cheatsheet.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/control-dependencies.rst b/Documentation/dev-tools/lkmm/docs/control-dependencies.rst
new file mode 100644
index 000000000..5ae97e886
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/control-dependencies.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Control Dependencies
+--------------------
+
+Literal include of ``tools/memory-model/Documentation/control-dependencies.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/control-dependencies.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/explanation.rst b/Documentation/dev-tools/lkmm/docs/explanation.rst
new file mode 100644
index 000000000..0bcba9a5d
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/explanation.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Explanation
+-----------
+
+Literal include of ``tools/memory-model/Documentation/explanation.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/explanation.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/glossary.rst b/Documentation/dev-tools/lkmm/docs/glossary.rst
new file mode 100644
index 000000000..849aefdf3
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/glossary.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Glossary
+--------
+
+Literal include of ``tools/memory-model/Documentation/glossary.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/glossary.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/herd-representation.rst b/Documentation/dev-tools/lkmm/docs/herd-representation.rst
new file mode 100644
index 000000000..f7b41f286
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/herd-representation.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+herd-representation
+-------------------
+
+Literal include of ``tools/memory-model/Documentation/herd-representation.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/herd-representation.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/index.rst b/Documentation/dev-tools/lkmm/docs/index.rst
new file mode 100644
index 000000000..abbddcc00
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/index.rst
@@ -0,0 +1,21 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Documentation
+=============
+
+.. toctree::
+   :maxdepth: 1
+
+   readme
+   simple
+   ordering
+   litmus-tests
+   locking
+   recipes
+   control-dependencies
+   access-marking
+   cheatsheet
+   explanation
+   herd-representation
+   glossary
+   references
diff --git a/Documentation/dev-tools/lkmm/docs/litmus-tests.rst b/Documentation/dev-tools/lkmm/docs/litmus-tests.rst
new file mode 100644
index 000000000..3293f4540
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/litmus-tests.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Litmus Tests
+------------
+
+Literal include of ``tools/memory-model/Documentation/litmus-tests.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/litmus-tests.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/locking.rst b/Documentation/dev-tools/lkmm/docs/locking.rst
new file mode 100644
index 000000000..b5eae4c0a
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/locking.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Locking
+-------
+
+Literal include of ``tools/memory-model/Documentation/locking.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/locking.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/ordering.rst b/Documentation/dev-tools/lkmm/docs/ordering.rst
new file mode 100644
index 000000000..a2343c124
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/ordering.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Ordering
+--------
+
+Literal include of ``tools/memory-model/Documentation/ordering.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/ordering.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/readme.rst b/Documentation/dev-tools/lkmm/docs/readme.rst
new file mode 100644
index 000000000..51e7a64e4
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/readme.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+README (for LKMM Documentation)
+-------------------------------
+
+Literal include of ``tools/memory-model/Documentation/README``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/README
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/recipes.rst b/Documentation/dev-tools/lkmm/docs/recipes.rst
new file mode 100644
index 000000000..e55952640
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/recipes.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Recipes
+-------
+
+Literal include of ``tools/memory-model/Documentation/recipes.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/recipes.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/references.rst b/Documentation/dev-tools/lkmm/docs/references.rst
new file mode 100644
index 000000000..c6831b3c9
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/references.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+References
+----------
+
+Literal include of ``tools/memory-model/Documentation/references.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/references.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/docs/simple.rst b/Documentation/dev-tools/lkmm/docs/simple.rst
new file mode 100644
index 000000000..5c1094c95
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/docs/simple.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Simple
+------
+
+Literal include of ``tools/memory-model/Documentation/simple.txt``.
+
+------------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/Documentation/simple.txt
+   :literal:
diff --git a/Documentation/dev-tools/lkmm/index.rst b/Documentation/dev-tools/lkmm/index.rst
new file mode 100644
index 000000000..e52782449
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/index.rst
@@ -0,0 +1,15 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+============================================
+Linux Kernel Memory Consistency Model (LKMM)
+============================================
+
+This section literally renders documents under ``tools/memory-model/``
+and ``tools/memory-model/Documentation/``, which are maintained in
+the *pure* plain text form.
+
+.. toctree::
+   :maxdepth: 2
+
+   readme
+   docs/index
diff --git a/Documentation/dev-tools/lkmm/readme.rst b/Documentation/dev-tools/lkmm/readme.rst
new file mode 100644
index 000000000..a7f847109
--- /dev/null
+++ b/Documentation/dev-tools/lkmm/readme.rst
@@ -0,0 +1,11 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+README (for LKMM)
+=================
+
+Literal include of ``tools/memory-model/README``.
+
+------------------------------------------------------------
+
+.. kernel-include:: tools/memory-model/README
+   :literal: