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.

1 files changed, 171 insertions, 0 deletions

diff --git a/Documentation/gpu/automated_testing.rst b/Documentation/gpu/automated_testing.rst
new file mode 100644
index 000000000..62aa3ede0
--- /dev/null
+++ b/Documentation/gpu/automated_testing.rst
@@ -0,0 +1,171 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+=========================================
+Automated testing of the DRM subsystem
+=========================================
+
+Introduction
+============
+
+Making sure that changes to the core or drivers don't introduce regressions can
+be very time-consuming when lots of different hardware configurations need to
+be tested. Moreover, it isn't practical for each person interested in this
+testing to have to acquire and maintain what can be a considerable amount of
+hardware.
+
+Also, it is desirable for developers to check for regressions in their code by
+themselves, instead of relying on the maintainers to find them and then
+reporting back.
+
+There are facilities in gitlab.freedesktop.org to automatically test Mesa that
+can be used as well for testing the DRM subsystem. This document explains how
+people interested in testing it can use this shared infrastructure to save
+quite some time and effort.
+
+
+Relevant files
+==============
+
+drivers/gpu/drm/ci/gitlab-ci.yml
+--------------------------------
+
+This is the root configuration file for GitLab CI. Among other less interesting
+bits, it specifies the specific version of the scripts to be used. There are
+some variables that can be modified to change the behavior of the pipeline:
+
+DRM_CI_PROJECT_PATH
+    Repository that contains the Mesa software infrastructure for CI
+
+DRM_CI_COMMIT_SHA
+    A particular revision to use from that repository
+
+UPSTREAM_REPO
+    URL to git repository containing the target branch
+
+TARGET_BRANCH
+    Branch to which this branch is to be merged into
+
+IGT_VERSION
+    Revision of igt-gpu-tools being used, from
+    https://gitlab.freedesktop.org/drm/igt-gpu-tools
+
+drivers/gpu/drm/ci/testlist.txt
+-------------------------------
+
+IGT tests to be run on all drivers (unless mentioned in a driver's \*-skips.txt
+file, see below).
+
+drivers/gpu/drm/ci/${DRIVER_NAME}-${HW_REVISION}-fails.txt
+----------------------------------------------------------
+
+Lists the known failures for a given driver on a specific hardware revision.
+
+drivers/gpu/drm/ci/${DRIVER_NAME}-${HW_REVISION}-flakes.txt
+-----------------------------------------------------------
+
+Lists the tests that for a given driver on a specific hardware revision are
+known to behave unreliably. These tests won't cause a job to fail regardless of
+the result. They will still be run.
+
+Each new flake entry must be associated with a link to the email reporting the
+bug to the author of the affected driver or the relevant GitLab issue. The entry
+must also include the board name or Device Tree name, the first kernel version
+affected, the IGT version used for tests, and an approximation of the failure rate.
+
+They should be provided under the following format::
+
+  # Bug Report: $LORE_URL_OR_GITLAB_ISSUE
+  # Board Name: broken-board.dtb
+  # Linux Version: 6.6-rc1
+  # IGT Version: 1.28-gd2af13d9f
+  # Failure Rate: 100
+  flaky-test
+
+Use the appropriate link below to create a GitLab issue:
+amdgpu driver: https://gitlab.freedesktop.org/drm/amd/-/issues
+i915 driver: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues
+msm driver: https://gitlab.freedesktop.org/drm/msm/-/issues
+xe driver: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues
+
+drivers/gpu/drm/ci/${DRIVER_NAME}-${HW_REVISION}-skips.txt
+-----------------------------------------------------------
+
+Lists the tests that won't be run for a given driver on a specific hardware
+revision. These are usually tests that interfere with the running of the test
+list due to hanging the machine, causing OOM, taking too long, etc.
+
+
+How to enable automated testing on your tree
+============================================
+
+1. Create a Linux tree in https://gitlab.freedesktop.org/ if you don't have one
+yet
+
+2. In your kernel repo's configuration (eg.
+https://gitlab.freedesktop.org/janedoe/linux/-/settings/ci_cd), change the
+CI/CD configuration file from .gitlab-ci.yml to
+drivers/gpu/drm/ci/gitlab-ci.yml.
+
+3. Request to be added to the drm/ci-ok group so that your user has the
+necessary privileges to run the CI on https://gitlab.freedesktop.org/drm/ci-ok
+
+4. Next time you push to this repository, you will see a CI pipeline being
+created (eg. https://gitlab.freedesktop.org/janedoe/linux/-/pipelines)
+
+5. The various jobs will be run and when the pipeline is finished, all jobs
+should be green unless a regression has been found.
+
+6. Warnings in the pipeline indicate that lockdep
+(see Documentation/locking/lockdep-design.rst) issues have been detected
+during the tests.
+
+
+How to update test expectations
+===============================
+
+If your changes to the code fix any tests, you will have to remove one or more
+lines from one or more of the files in
+drivers/gpu/drm/ci/${DRIVER_NAME}_*_fails.txt, for each of the test platforms
+affected by the change.
+
+
+How to expand coverage
+======================
+
+If your code changes make it possible to run more tests (by solving reliability
+issues, for example), you can remove tests from the flakes and/or skips lists,
+and then the expected results if there are any known failures.
+
+If there is a need for updating the version of IGT being used (maybe you have
+added more tests to it), update the IGT_VERSION variable at the top of the
+gitlab-ci.yml file.
+
+
+How to test your changes to the scripts
+=======================================
+
+For testing changes to the scripts in the drm-ci repo, change the
+DRM_CI_PROJECT_PATH and DRM_CI_COMMIT_SHA variables in
+drivers/gpu/drm/ci/gitlab-ci.yml to match your fork of the project (eg.
+janedoe/drm-ci). This fork needs to be in https://gitlab.freedesktop.org/.
+
+
+How to incorporate external fixes in your testing
+=================================================
+
+Often, regressions in other trees will prevent testing changes local to the
+tree under test. These fixes will be automatically merged in during the build
+jobs from a branch in the target tree that is named as
+${TARGET_BRANCH}-external-fixes.
+
+If the pipeline is not in a merge request and a branch with the same name
+exists in the local tree, commits from that branch will be merged in as well.
+
+
+How to deal with automated testing labs that may be down
+========================================================
+
+If a hardware farm is down and thus causing pipelines to fail that would
+otherwise pass, one can disable all jobs that would be submitted to that farm
+by editing the file at
+https://gitlab.freedesktop.org/gfx-ci/lab-status/-/blob/main/lab-status.yml.