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, 91 insertions, 0 deletions

diff --git a/include/sound/sdca.h b/include/sound/sdca.h
new file mode 100644
index 000000000..2bdf4e333
--- /dev/null
+++ b/include/sound/sdca.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
+/*
+ * The MIPI SDCA specification is available for public downloads at
+ * https://www.mipi.org/mipi-sdca-v1-0-download
+ *
+ * Copyright(c) 2024 Intel Corporation
+ */
+
+#ifndef __SDCA_H__
+#define __SDCA_H__
+
+#include <linux/types.h>
+#include <linux/kconfig.h>
+
+struct acpi_table_swft;
+struct fwnode_handle;
+struct sdw_slave;
+struct sdca_dev;
+
+#define SDCA_MAX_FUNCTION_COUNT 8
+
+/**
+ * struct sdca_function_desc - short descriptor for an SDCA Function
+ * @node: firmware node for the Function.
+ * @func_dev: pointer to SDCA function device.
+ * @name: Human-readable string.
+ * @type: Function topology type.
+ * @adr: ACPI address (used for SDCA register access).
+ * @duplicate: Internal flag to indicate if other functions of the same type
+ * exist.
+ */
+struct sdca_function_desc {
+	struct fwnode_handle *node;
+	struct sdca_dev *func_dev;
+	const char *name;
+	u32 type;
+	u8 adr;
+
+	bool duplicate;
+};
+
+/**
+ * struct sdca_device_data - structure containing all SDCA related information
+ * @interface_revision: Value read from _DSD property, mainly to check
+ * for changes between silicon versions.
+ * @num_functions: Total number of supported SDCA functions. Invalid/unsupported
+ * functions will be skipped.
+ * @function: Array of function descriptors.
+ * @swft: Pointer to the SWFT table, if available.
+ */
+struct sdca_device_data {
+	u32 interface_revision;
+	int num_functions;
+	struct sdca_function_desc function[SDCA_MAX_FUNCTION_COUNT];
+	struct acpi_table_swft *swft;
+};
+
+enum sdca_quirk {
+	SDCA_QUIRKS_RT712_VB,
+	SDCA_QUIRKS_SKIP_FUNC_TYPE_PATCHING,
+};
+
+#if IS_ENABLED(CONFIG_ACPI) && IS_ENABLED(CONFIG_SND_SOC_SDCA)
+
+void sdca_lookup_functions(struct sdw_slave *slave);
+void sdca_lookup_swft(struct sdw_slave *slave);
+void sdca_lookup_interface_revision(struct sdw_slave *slave);
+bool sdca_device_quirk_match(struct sdw_slave *slave, enum sdca_quirk quirk);
+int sdca_dev_register_functions(struct sdw_slave *slave);
+void sdca_dev_unregister_functions(struct sdw_slave *slave);
+
+#else
+
+static inline void sdca_lookup_functions(struct sdw_slave *slave) {}
+static inline void sdca_lookup_swft(struct sdw_slave *slave) {}
+static inline void sdca_lookup_interface_revision(struct sdw_slave *slave) {}
+static inline bool sdca_device_quirk_match(struct sdw_slave *slave, enum sdca_quirk quirk)
+{
+	return false;
+}
+
+static inline int sdca_dev_register_functions(struct sdw_slave *slave)
+{
+	return 0;
+}
+
+static inline void sdca_dev_unregister_functions(struct sdw_slave *slave) {}
+
+#endif
+
+#endif