Merge tag 'driver-core-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-coreHEADmainline

Pull driver core updates from Danilo Krummrich:
 "Arch Topology:
   - Move parse_acpi_topology() from arm64 to common code for reuse in
     RISC-V

  CPU:
   - Expose housekeeping CPUs through /sys/devices/system/cpu/housekeeping
   - Print a newline (or 0x0A) instead of '(null)' reading
     /sys/devices/system/cpu/nohz_full when nohz_full= is not set

  debugfs
   - Remove (broken) 'no-mount' mode
   - Remove redundant access mode checks in debugfs_get_tree() and
     debugfs_create_*() functions

  Devres:
   - Remove unused devm_free_percpu() helper
   - Move devm_alloc_percpu() from device.h to devres.h

  Firmware Loader:
   - Replace simple_strtol() with kstrtoint()
   - Do not call cancel_store() when no upload is in progress

  kernfs:
   - Increase struct super_block::maxbytes to MAX_LFS_FILESIZE
   - Fix a missing unwind path in __kernfs_new_node()

  Misc:
   - Increase the name size in struct auxiliary_device_id to 40
     characters
   - Replace system_unbound_wq with system_dfl_wq and add WQ_PERCPU to
     alloc_workqueue()

  Platform:
   - Replace ERR_PTR() with IOMEM_ERR_PTR() in platform ioremap
     functions

  Rust:
   - Auxiliary:
      - Unregister auxiliary device on parent device unbind
      - Move parent() to impl Device; implement device context aware
        parent() for Device<Bound>
      - Illustrate how to safely obtain a driver's device private data
        when calling from an auxiliary driver into the parant device
        driver

   - DebugFs:
      - Implement support for binary large objects

   - Device:
      - Let probe() return the driver's device private data as pinned
        initializer, i.e. impl PinInit<Self, Error>
      - Implement safe accessor for a driver's device private data for
        Device<Bound> (returned reference can't out-live driver binding
        and guarantees the correct private data type)
      - Implement AsBusDevice trait, to be used by class device
        abstractions to derive the bus device type of the parent device

   - DMA:
      - Store raw pointer of allocation as NonNull
      - Use start_ptr() and start_ptr_mut() to inherit correct
        mutability of self

   - FS:
      - Add file::Offset type alias

   - I2C:
      - Add abstractions for I2C device / driver infrastructure
      - Implement abstractions for manual I2C device registrations

   - I/O:
      - Use "kernel vertical" style for imports
      - Define ResourceSize as resource_size_t
      - Move ResourceSize to top-level I/O module
      - Add type alias for phys_addr_t
      - Implement Rust version of read_poll_timeout_atomic()

   - PCI:
      - Use "kernel vertical" style for imports
      - Move I/O and IRQ infrastructure to separate files
      - Add support for PCI interrupt vectors
      - Implement TryInto<IrqRequest<'a>> for IrqVector<'a> to convert
        an IrqVector bound to specific pci::Device into an IrqRequest
        bound to the same pci::Device's parent Device
      - Leverage pin_init_scope() to get rid of redundant Result in IRQ
        methods

   - PinInit:
      - Add {pin_}init_scope() to execute code before creating an
        initializer

   - Platform:
      - Leverage pin_init_scope() to get rid of redundant Result in IRQ
        methods

   - Timekeeping:
      - Implement abstraction of udelay()

   - Uaccess:
      - Implement read_slice_partial() and read_slice_file() for
        UserSliceReader
      - Implement write_slice_partial() and write_slice_file() for
        UserSliceWriter

  sysfs:
   - Prepare the constification of struct attribute"

* tag 'driver-core-6.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/driver-core/driver-core: (75 commits)
  rust: pci: fix build failure when CONFIG_PCI_MSI is disabled
  debugfs: Fix default access mode config check
  debugfs: Remove broken no-mount mode
  debugfs: Remove redundant access mode checks
  driver core: Check drivers_autoprobe for all added devices
  driver core: WQ_PERCPU added to alloc_workqueue users
  driver core: replace use of system_unbound_wq with system_dfl_wq
  tick/nohz: Expose housekeeping CPUs in sysfs
  tick/nohz: avoid showing '(null)' if nohz_full= not set
  sysfs/cpu: Use DEVICE_ATTR_RO for nohz_full attribute
  kernfs: fix memory leak of kernfs_iattrs in __kernfs_new_node
  fs/kernfs: raise sb->maxbytes to MAX_LFS_FILESIZE
  mod_devicetable: Bump auxiliary_device_id name size
  sysfs: simplify attribute definition macros
  samples/kobject: constify 'struct foo_attribute'
  samples/kobject: add is_visible() callback to attribute group
  sysfs: attribute_group: enable const variants of is_visible()
  sysfs: introduce __SYSFS_FUNCTION_ALTERNATIVE()
  sysfs: transparently handle const pointers in ATTRIBUTE_GROUPS()
  sysfs: attribute_group: allow registration of const attribute
  ...

1 files changed, 30 insertions, 14 deletions

diff --git a/samples/kobject/kset-example.c b/samples/kobject/kset-example.c
index 579ce150217c..d0103904e5dd 100644
--- a/samples/kobject/kset-example.c
+++ b/samples/kobject/kset-example.c
@@ -37,10 +37,11 @@ struct foo_obj {
 /* a custom attribute that works just for a struct foo_obj. */
 struct foo_attribute {
 	struct attribute attr;
-	ssize_t (*show)(struct foo_obj *foo, struct foo_attribute *attr, char *buf);
-	ssize_t (*store)(struct foo_obj *foo, struct foo_attribute *attr, const char *buf, size_t count);
+	ssize_t (*show)(struct foo_obj *foo, const struct foo_attribute *attr, char *buf);
+	ssize_t (*store)(struct foo_obj *foo, const struct foo_attribute *attr,
+			 const char *buf, size_t count);
 };
-#define to_foo_attr(x) container_of(x, struct foo_attribute, attr)
+#define to_foo_attr(x) container_of_const(x, struct foo_attribute, attr)
 
 /*
  * The default show function that must be passed to sysfs.  This will be
@@ -53,7 +54,7 @@ static ssize_t foo_attr_show(struct kobject *kobj,
 			     struct attribute *attr,
 			     char *buf)
 {
-	struct foo_attribute *attribute;
+	const struct foo_attribute *attribute;
 	struct foo_obj *foo;
 
 	attribute = to_foo_attr(attr);
@@ -73,7 +74,7 @@ static ssize_t foo_attr_store(struct kobject *kobj,
 			      struct attribute *attr,
 			      const char *buf, size_t len)
 {
-	struct foo_attribute *attribute;
+	const struct foo_attribute *attribute;
 	struct foo_obj *foo;
 
 	attribute = to_foo_attr(attr);
@@ -109,13 +110,13 @@ static void foo_release(struct kobject *kobj)
 /*
  * The "foo" file where the .foo variable is read from and written to.
  */
-static ssize_t foo_show(struct foo_obj *foo_obj, struct foo_attribute *attr,
+static ssize_t foo_show(struct foo_obj *foo_obj, const struct foo_attribute *attr,
 			char *buf)
 {
 	return sysfs_emit(buf, "%d\n", foo_obj->foo);
 }
 
-static ssize_t foo_store(struct foo_obj *foo_obj, struct foo_attribute *attr,
+static ssize_t foo_store(struct foo_obj *foo_obj, const struct foo_attribute *attr,
 			 const char *buf, size_t count)
 {
 	int ret;
@@ -128,14 +129,14 @@ static ssize_t foo_store(struct foo_obj *foo_obj, struct foo_attribute *attr,
 }
 
 /* Sysfs attributes cannot be world-writable. */
-static struct foo_attribute foo_attribute =
+static const struct foo_attribute foo_attribute =
 	__ATTR(foo, 0664, foo_show, foo_store);
 
 /*
  * More complex function where we determine which variable is being accessed by
  * looking at the attribute for the "baz" and "bar" files.
  */
-static ssize_t b_show(struct foo_obj *foo_obj, struct foo_attribute *attr,
+static ssize_t b_show(struct foo_obj *foo_obj, const struct foo_attribute *attr,
 		      char *buf)
 {
 	int var;
@@ -147,7 +148,7 @@ static ssize_t b_show(struct foo_obj *foo_obj, struct foo_attribute *attr,
 	return sysfs_emit(buf, "%d\n", var);
 }
 
-static ssize_t b_store(struct foo_obj *foo_obj, struct foo_attribute *attr,
+static ssize_t b_store(struct foo_obj *foo_obj, const struct foo_attribute *attr,
 		       const char *buf, size_t count)
 {
 	int var, ret;
@@ -163,22 +164,37 @@ static ssize_t b_store(struct foo_obj *foo_obj, struct foo_attribute *attr,
 	return count;
 }
 
-static struct foo_attribute baz_attribute =
+static const struct foo_attribute baz_attribute =
 	__ATTR(baz, 0664, b_show, b_store);
-static struct foo_attribute bar_attribute =
+static const struct foo_attribute bar_attribute =
 	__ATTR(bar, 0664, b_show, b_store);
 
 /*
  * Create a group of attributes so that we can create and destroy them all
  * at once.
  */
-static struct attribute *foo_default_attrs[] = {
+static const struct attribute *const foo_default_attrs[] = {
 	&foo_attribute.attr,
 	&baz_attribute.attr,
 	&bar_attribute.attr,
 	NULL,	/* need to NULL terminate the list of attributes */
 };
-ATTRIBUTE_GROUPS(foo_default);
+
+static umode_t foo_default_attrs_is_visible(struct kobject *kobj,
+					    const struct attribute *attr,
+					    int n)
+{
+	/* Hide attributes with the same name as the kobject. */
+	if (strcmp(kobject_name(kobj), attr->name) == 0)
+		return 0;
+	return attr->mode;
+}
+
+static const struct attribute_group foo_default_group = {
+	.attrs_const		= foo_default_attrs,
+	.is_visible_const	= foo_default_attrs_is_visible,
+};
+__ATTRIBUTE_GROUPS(foo_default);
 
 /*
  * Our own ktype for our kobjects.  Here we specify our sysfs ops, the