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, 142 insertions, 0 deletions

diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
new file mode 100644
index 000000000..8299fb5fa
--- /dev/null
+++ b/tools/perf/util/data.h
@@ -0,0 +1,142 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_DATA_H
+#define __PERF_DATA_H
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <linux/types.h>
+
+enum perf_data_mode {
+	PERF_DATA_MODE_WRITE,
+	PERF_DATA_MODE_READ,
+};
+
+enum perf_dir_version {
+	PERF_DIR_SINGLE_FILE	= 0,
+	PERF_DIR_VERSION	= 1,
+};
+
+/**
+ * struct perf_data_file: A wrapper around a file used for perf.data reading or writing. Generally
+ * part of struct perf_data.
+ */
+struct perf_data_file {
+	/**
+	 * @path: Path of file. Generally a copy of perf_data.path but for a
+	 * directory it is the file within the directory.
+	 */
+	char		*path;
+	union {
+		/** @fd: File descriptor for read/writes. Valid if use_stdio is false. */
+		int	 fd;
+		/**
+		 * @fptr: Stdio FILE. Valid if use_stdio is true, currently just
+		 * pipes in perf inject.
+		 */
+		FILE	*fptr;
+	};
+	/** @size: Size of file when opened. */
+	unsigned long	 size;
+	/** @use_stdio: Use buffered stdio operations. */
+	bool		 use_stdio;
+};
+
+/**
+ * struct perf_data: A wrapper around a file used for perf.data reading or writing.
+ */
+struct perf_data {
+	/** @path: Path to open and of the file. NULL implies 'perf.data' will be used. */
+	const char		*path;
+	/** @file: Underlying file to be used. */
+	struct perf_data_file	 file;
+	/** @is_pipe: Underlying file is a pipe. */
+	bool			 is_pipe;
+	/** @is_dir: Underlying file is a directory. */
+	bool			 is_dir;
+	/** @force: Ignore opening a file creating created by a different user. */
+	bool			 force;
+	/** @in_place_update: A file opened for reading but will be written to. */
+	bool			 in_place_update;
+	/** @mode: Read or write mode. */
+	enum perf_data_mode	 mode;
+
+	struct {
+		/** @version: perf_dir_version. */
+		u64			 version;
+		/** @files: perf data files for the directory. */
+		struct perf_data_file	*files;
+		/** @nr: Number of perf data files for the directory. */
+		int			 nr;
+	} dir;
+};
+
+static inline int perf_data_file__fd(struct perf_data_file *file)
+{
+	return file->use_stdio ? fileno(file->fptr) : file->fd;
+}
+
+ssize_t perf_data_file__write(struct perf_data_file *file,
+			      void *buf, size_t size);
+off_t perf_data_file__seek(struct perf_data_file *file, off_t offset, int whence);
+
+
+static inline bool perf_data__is_read(struct perf_data *data)
+{
+	return data->mode == PERF_DATA_MODE_READ;
+}
+
+static inline bool perf_data__is_write(struct perf_data *data)
+{
+	return data->mode == PERF_DATA_MODE_WRITE;
+}
+
+static inline int perf_data__is_pipe(struct perf_data *data)
+{
+	return data->is_pipe;
+}
+
+static inline bool perf_data__is_dir(struct perf_data *data)
+{
+	return data->is_dir;
+}
+
+static inline bool perf_data__is_single_file(struct perf_data *data)
+{
+	return data->dir.version == PERF_DIR_SINGLE_FILE;
+}
+
+static inline int perf_data__fd(struct perf_data *data)
+{
+	return perf_data_file__fd(&data->file);
+}
+
+int perf_data__open(struct perf_data *data);
+void perf_data__close(struct perf_data *data);
+ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size);
+ssize_t perf_data__write(struct perf_data *data,
+			 void *buf, size_t size);
+off_t perf_data__seek(struct perf_data *data, off_t offset, int whence);
+/*
+ * If at_exit is set, only rename current perf.data to
+ * perf.data.<postfix>, continue write on original data.
+ * Set at_exit when flushing the last output.
+ *
+ * Return value is fd of new output.
+ */
+int perf_data__switch(struct perf_data *data,
+		      const char *postfix,
+		      size_t pos, bool at_exit, char **new_filepath);
+
+int perf_data__create_dir(struct perf_data *data, int nr);
+int perf_data__open_dir(struct perf_data *data);
+void perf_data__close_dir(struct perf_data *data);
+unsigned long perf_data__size(struct perf_data *data);
+int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz);
+char *perf_data__kallsyms_name(struct perf_data *data);
+char *perf_data__guest_kallsyms_name(struct perf_data *data, pid_t machine_pid);
+
+bool has_kcore_dir(const char *path);
+bool is_perf_data(const char *path);
+
+#endif /* __PERF_DATA_H */