kernel/linux.git/drivers/cpuidle/sysfs.c, branch v7.0.10

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

cpuidle: sysfs: Use sysfs_emit()/sysfs_emit_at() instead of sprintf()/scnprintf()

2025-09-20T11:06:37+00:00

The ->show() callbacks in sysfs should use sysfs_emit() or sysfs_emit_at() when formatting values for user space. These helpers are the recommended way to ensure correct buffer handling and consistency across the kernel. See Documentation/filesystems/sysfs.rst for details. No functional change intended. Suggested-by: Joe Perches Signed-off-by: Vivek Yadav Link: https://patch.msgid.link/20250919165657.233349-1-vivekyadav1207731111@gmail.com [ rjw: Minor subject edits ] Signed-off-by: Rafael J. Wysocki

cpuidle: move to use bus_get_dev_root()

2023-03-22T19:25:23+00:00

Direct access to the struct bus_type dev_root pointer is going away soon so replace that with a call to bus_get_dev_root() instead, which is what it is there for. This allows us to clean up the cpuidle_add_interface() call a bit as it was only called in one place, with the same argument so just put that into the function itself. Note that cpuidle_remove_interface() should also probably be removed in the future as there are no callers of it for some reason. Cc: Daniel Lezcano Cc: linux-pm@vger.kernel.org Acked-by: Rafael J. Wysocki Link: https://lore.kernel.org/r/20230322090557.2943479-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

cpuidle: sysfs: make kobj_type structures constant

2023-02-09T20:04:01+00:00

Since commit ee6d3dd4ed48 ("driver core: make kobj_type constant.") the driver core allows the usage of const struct kobj_type. Take advantage of this to constify the structure definitions to prevent modification at runtime. Signed-off-by: Thomas Weißschuh Signed-off-by: Rafael J. Wysocki

cpuidle: use default_groups in kobj_type

2022-01-05T17:31:17+00:00

There are currently 2 ways to create a set of sysfs files for a kobj_type, through the default_attrs field, and the default_groups field. Move the cpuidle sysfs code to use default_groups field which has been the preferred way since aa30f47cf666 ("kobject: Add support for default attribute groups to kobj_type") so that we can soon get rid of the obsolete default_attrs field. Signed-off-by: Greg Kroah-Hartman Signed-off-by: Rafael J. Wysocki

cpuidle: Fix cpuidle_remove_state_sysfs() kerneldoc comment

2021-12-17T15:20:23+00:00

Fix function name in sysfs.c kernel-doc comment to remove a warning found by running scripts/kernel-doc, which is caused by using 'make W=1'. drivers/cpuidle/sysfs.c:512: warning: expecting prototype for cpuidle_remove_driver_sysfs(). Prototype was for cpuidle_remove_state_sysfs() instead Reported-by: Abaci Robot Signed-off-by: Yang Li [ rjw: Subject edits ] Signed-off-by: Rafael J. Wysocki

cpuidle: Fix kobject memory leaks in error paths

2021-10-01T18:42:22+00:00

Commit c343bf1ba5ef ("cpuidle: Fix three reference count leaks") fixes the cleanup of kobjects; however, it removes kfree() calls altogether, leading to memory leaks. Fix those and also defer the initialization of dev->kobj_dev until after the error check, so that we do not end up with a dangling pointer. Fixes: c343bf1ba5ef ("cpuidle: Fix three reference count leaks") Signed-off-by: Anel Orazgaliyeva Suggested-by: Aman Priyadarshi [ rjw: Subject edits ] Signed-off-by: Rafael J. Wysocki

cpuidle: record state entry rejection statistics

2020-09-23T12:10:31+00:00

CPUs may fail to enter the chosen idle state if there was a pending interrupt, causing the cpuidle driver to return an error value. Record that and export it via sysfs along with the other idle state statistics. This could prove useful in understanding behavior of the governor and the system during usecases that involve multiple CPUs. Signed-off-by: Lina Iyer [ rjw: Changelog and documentation edits ] Signed-off-by: Rafael J. Wysocki

cpuidle: Fix three reference count leaks

2020-05-29T16:07:18+00:00

kobject_init_and_add() takes reference even when it fails. If this function returns an error, kobject_put() must be called to properly clean up the memory associated with the object. Previous commit "b8eb718348b8" fixed a similar problem. Signed-off-by: Qiushi Wu [ rjw: Subject ] Signed-off-by: Rafael J. Wysocki