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, 45 insertions, 0 deletions

diff --git a/tools/perf/util/counts.h b/tools/perf/util/counts.h
new file mode 100644
index 000000000..42760242e
--- /dev/null
+++ b/tools/perf/util/counts.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_COUNTS_H
+#define __PERF_COUNTS_H
+
+#include <linux/types.h>
+#include <internal/xyarray.h>
+#include <perf/evsel.h>
+#include <stdbool.h>
+
+struct evsel;
+
+struct perf_counts {
+	s8			  scaled;
+	struct xyarray		  *values;
+	struct xyarray		  *loaded;
+};
+
+
+static inline struct perf_counts_values*
+perf_counts(struct perf_counts *counts, int cpu_map_idx, int thread)
+{
+	return xyarray__entry(counts->values, cpu_map_idx, thread);
+}
+
+static inline bool
+perf_counts__is_loaded(struct perf_counts *counts, int cpu_map_idx, int thread)
+{
+	return *((bool *) xyarray__entry(counts->loaded, cpu_map_idx, thread));
+}
+
+static inline void
+perf_counts__set_loaded(struct perf_counts *counts, int cpu_map_idx, int thread, bool loaded)
+{
+	*((bool *) xyarray__entry(counts->loaded, cpu_map_idx, thread)) = loaded;
+}
+
+struct perf_counts *perf_counts__new(int ncpus, int nthreads);
+void perf_counts__delete(struct perf_counts *counts);
+void perf_counts__reset(struct perf_counts *counts);
+
+void evsel__reset_counts(struct evsel *evsel);
+int evsel__alloc_counts(struct evsel *evsel);
+void evsel__free_counts(struct evsel *evsel);
+
+#endif /* __PERF_COUNTS_H */