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, 34 insertions, 0 deletions

diff --git a/tools/testing/kunit/kunit-completion.sh b/tools/testing/kunit/kunit-completion.sh
new file mode 100644
index 000000000..f053e7b5d
--- /dev/null
+++ b/tools/testing/kunit/kunit-completion.sh
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: GPL-2.0
+# bash completion support for KUnit
+
+_kunit_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+
+_kunit()
+{
+	local cur prev words cword
+	_init_completion || return
+
+	local script="${_kunit_dir}/kunit.py"
+
+	if [[ $cword -eq 1 && "$cur" != -* ]]; then
+		local cmds=$(${script} --list-cmds 2>/dev/null)
+		COMPREPLY=($(compgen -W "${cmds}" -- "$cur"))
+		return 0
+	fi
+
+	if [[ "$cur" == -* ]]; then
+		if [[ -n "${words[1]}" && "${words[1]}" != -* ]]; then
+			local opts=$(${script} ${words[1]} --list-opts 2>/dev/null)
+			COMPREPLY=($(compgen -W "${opts}" -- "$cur"))
+			return 0
+		else
+			local opts=$(${script} --list-opts 2>/dev/null)
+			COMPREPLY=($(compgen -W "${opts}" -- "$cur"))
+			return 0
+		fi
+	fi
+}
+
+complete -o default -F _kunit kunit.py
+complete -o default -F _kunit kunit
+complete -o default -F _kunit ./tools/testing/kunit/kunit.py