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, 181 insertions, 0 deletions

diff --git a/drivers/firmware/efi/dev-path-parser.c b/drivers/firmware/efi/dev-path-parser.c
new file mode 100644
index 000000000..13ea141c0
--- /dev/null
+++ b/drivers/firmware/efi/dev-path-parser.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dev-path-parser.c - EFI Device Path parser
+ * Copyright (C) 2016 Lukas Wunner <lukas@wunner.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2) as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/acpi.h>
+#include <linux/efi.h>
+#include <linux/pci.h>
+
+static long __init parse_acpi_path(const struct efi_dev_path *node,
+				   struct device *parent, struct device **child)
+{
+	struct acpi_device *adev;
+	struct device *phys_dev;
+	char hid[ACPI_ID_LEN];
+
+	if (node->header.length != 12)
+		return -EINVAL;
+
+	sprintf(hid, "%c%c%c%04X",
+		'A' + ((node->acpi.hid >> 10) & 0x1f) - 1,
+		'A' + ((node->acpi.hid >>  5) & 0x1f) - 1,
+		'A' + ((node->acpi.hid >>  0) & 0x1f) - 1,
+			node->acpi.hid >> 16);
+
+	for_each_acpi_dev_match(adev, hid, NULL, -1) {
+		if (acpi_dev_uid_match(adev, node->acpi.uid))
+			break;
+		if (!acpi_device_uid(adev) && node->acpi.uid == 0)
+			break;
+	}
+	if (!adev)
+		return -ENODEV;
+
+	phys_dev = acpi_get_first_physical_node(adev);
+	if (phys_dev) {
+		*child = get_device(phys_dev);
+		acpi_dev_put(adev);
+	} else
+		*child = &adev->dev;
+
+	return 0;
+}
+
+static int __init match_pci_dev(struct device *dev, const void *data)
+{
+	unsigned int devfn = *(const unsigned int *)data;
+
+	return dev_is_pci(dev) && to_pci_dev(dev)->devfn == devfn;
+}
+
+static long __init parse_pci_path(const struct efi_dev_path *node,
+				  struct device *parent, struct device **child)
+{
+	unsigned int devfn;
+
+	if (node->header.length != 6)
+		return -EINVAL;
+	if (!parent)
+		return -EINVAL;
+
+	devfn = PCI_DEVFN(node->pci.dev, node->pci.fn);
+
+	*child = device_find_child(parent, &devfn, match_pci_dev);
+	if (!*child)
+		return -ENODEV;
+
+	return 0;
+}
+
+/*
+ * Insert parsers for further node types here.
+ *
+ * Each parser takes a pointer to the @node and to the @parent (will be NULL
+ * for the first device path node). If a device corresponding to @node was
+ * found below @parent, its reference count should be incremented and the
+ * device returned in @child.
+ *
+ * The return value should be 0 on success or a negative int on failure.
+ * The special return values 0x01 (EFI_DEV_END_INSTANCE) and 0xFF
+ * (EFI_DEV_END_ENTIRE) signal the end of the device path, only
+ * parse_end_path() is supposed to return this.
+ *
+ * Be sure to validate the node length and contents before commencing the
+ * search for a device.
+ */
+
+static long __init parse_end_path(const struct efi_dev_path *node,
+				  struct device *parent, struct device **child)
+{
+	if (node->header.length != 4)
+		return -EINVAL;
+	if (node->header.sub_type != EFI_DEV_END_INSTANCE &&
+	    node->header.sub_type != EFI_DEV_END_ENTIRE)
+		return -EINVAL;
+	if (!parent)
+		return -ENODEV;
+
+	*child = get_device(parent);
+	return node->header.sub_type;
+}
+
+/**
+ * efi_get_device_by_path - find device by EFI Device Path
+ * @node: EFI Device Path
+ * @len: maximum length of EFI Device Path in bytes
+ *
+ * Parse a series of EFI Device Path nodes at @node and find the corresponding
+ * device.  If the device was found, its reference count is incremented and a
+ * pointer to it is returned.  The caller needs to drop the reference with
+ * put_device() after use.  The @node pointer is updated to point to the
+ * location immediately after the "End of Hardware Device Path" node.
+ *
+ * If another Device Path instance follows, @len is decremented by the number
+ * of bytes consumed.  Otherwise @len is set to %0.
+ *
+ * If a Device Path node is malformed or its corresponding device is not found,
+ * @node is updated to point to this offending node and an ERR_PTR is returned.
+ *
+ * If @len is initially %0, the function returns %NULL.  Thus, to iterate over
+ * all instances in a path, the following idiom may be used:
+ *
+ *	while (!IS_ERR_OR_NULL(dev = efi_get_device_by_path(&node, &len))) {
+ *		// do something with dev
+ *		put_device(dev);
+ *	}
+ *	if (IS_ERR(dev))
+ *		// report error
+ *
+ * Devices can only be found if they're already instantiated. Most buses
+ * instantiate devices in the "subsys" initcall level, hence the earliest
+ * initcall level in which this function should be called is "fs".
+ *
+ * Returns the device on success or
+ *	%ERR_PTR(-ENODEV) if no device was found,
+ *	%ERR_PTR(-EINVAL) if a node is malformed or exceeds @len,
+ *	%ERR_PTR(-ENOTSUPP) if support for a node type is not yet implemented.
+ */
+struct device * __init efi_get_device_by_path(const struct efi_dev_path **node,
+					      size_t *len)
+{
+	struct device *parent = NULL, *child;
+	long ret = 0;
+
+	if (!*len)
+		return NULL;
+
+	while (!ret) {
+		if (*len < 4 || *len < (*node)->header.length)
+			ret = -EINVAL;
+		else if ((*node)->header.type		== EFI_DEV_ACPI &&
+			 (*node)->header.sub_type	== EFI_DEV_BASIC_ACPI)
+			ret = parse_acpi_path(*node, parent, &child);
+		else if ((*node)->header.type		== EFI_DEV_HW &&
+			 (*node)->header.sub_type	== EFI_DEV_PCI)
+			ret = parse_pci_path(*node, parent, &child);
+		else if (((*node)->header.type		== EFI_DEV_END_PATH ||
+			  (*node)->header.type		== EFI_DEV_END_PATH2))
+			ret = parse_end_path(*node, parent, &child);
+		else
+			ret = -ENOTSUPP;
+
+		put_device(parent);
+		if (ret < 0)
+			return ERR_PTR(ret);
+
+		parent = child;
+		*node  = (void *)*node + (*node)->header.length;
+		*len  -= (*node)->header.length;
+	}
+
+	if (ret == EFI_DEV_END_ENTIRE)
+		*len = 0;
+
+	return child;
+}