kernel/linux.git/drivers/acpi/processor_idle.c, branch v7.0-rc7

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

ACPI: processor: idle: Rework the handling of acpi_processor_ffh_lpi_probe()

2026-01-27T15:33:43+00:00

Move the acpi_processor_ffh_lpi_probe() call from acpi_processor_setup_cpuidle_dev(), where its return value is ignored, to acpi_processor_get_power_info(), which can take the return value of that function into account in a meaningful way and generally is a more suitable place for calling it. Signed-off-by: Huisong Li [ rjw: Message adjustment, subject and changelog edits ] Link: https://patch.msgid.link/20260120112258.1595164-4-lihuisong@huawei.com Signed-off-by: Rafael J. Wysocki

ACPI: processor: idle: Convert acpi_processor_setup_cpuidle_dev() to void

2026-01-27T15:33:43+00:00

The callers of acpi_processor_setup_cpuidle_dev() ignore its return value, so convert it to a void function. No intentional functional impact. Signed-off-by: Huisong Li [ rjw: Subject and changelog edits ] Link: https://patch.msgid.link/20260120112258.1595164-3-lihuisong@huawei.com Signed-off-by: Rafael J. Wysocki

ACPI: processor: idle: Convert acpi_processor_setup_cpuidle_states() to void

2026-01-27T15:33:43+00:00

Since all callers of acpi_processor_setup_cpuidle_states() ignore its return value and it simply passes the acpi_processor_setup_lpi_states() return value to its callers, convert both of these functions to void. No intentional functional impact. Signed-off-by: Huisong Li [ rjw: Subject and changelog edits ] Link: https://patch.msgid.link/20260120112258.1595164-2-lihuisong@huawei.com Signed-off-by: Rafael J. Wysocki

ACPI: processor: idle: Add debug log for states with invalid entry methods

2026-01-14T16:46:42+00:00

According to ACPI spec, entry method in LPI sub-package must be a buffer or an integer. The driver will disable the state whose the entry method is invalid by zeroing flags in struct acpi_lpi_state. The entry method is very key in cpuidle. A debug log is very useful for developers. Signed-off-by: Huisong Li Reviewed-by: Jonathan Cameron [ rjw: Subject and changelog edits, changed "illegal" to "invalid" ] Link: https://patch.msgid.link/20251125064702.3666149-1-lihuisong@huawei.com Signed-off-by: Rafael J. Wysocki

ACPI: processor: Do not expose global variable acpi_idle_driver

2026-01-09T21:38:22+00:00

Move the cpuidle driver check from __acpi_processor_start() to acpi_processor_power_init() which allows variable acpi_idle_driver to become static. No intentional functional impact. Signed-off-by: Huisong Li Tested-by: Borislav Petkov (AMD) Link: https://patch.msgid.link/20251223100914.2407069-7-lihuisong@huawei.com Signed-off-by: Rafael J. Wysocki

ACPI: processor: idle: Redefine two functions as void

2026-01-09T21:38:22+00:00

Notice that acpi_processor_power_init() and acpi_processor_power_exit() don't need to return any values because their callers don't check them anyway, so redefine those functions as void. While at it, rearrange the code in acpi_processor_power_init() to reduce the indentation level, get rid of a redundant local variable in that function, and rephrase a code comment in it. No intentional functional impact. Signed-off-by: Rafael J. Wysocki Reviewed-by: Mario Limonciello (AMD) Tested-by: Borislav Petkov (AMD) Link: https://patch.msgid.link/20251223100914.2407069-5-lihuisong@huawei.com Signed-off-by: Rafael J. Wysocki

ACPI: processor: idle: Optimize ACPI idle driver registration

2026-01-09T21:38:21+00:00

Currently, the ACPI idle driver is registered from within a CPU hotplug callback. Although this didn't cause any functional issues, this is questionable and confusing. And it is better to register the cpuidle driver when all of the CPUs have been brought up. So add a new function to initialize acpi_idle_driver based on the power management information of an available CPU and register cpuidle driver in acpi_processor_driver_init(). This commit has four changes under the commit 7a8c994cbb2d (ACPI: processor: idle: Optimize ACPI idle driver registration): 1) move acpi_processor_register_idle_driver() ahead of the driver_register(). 2) add acpi_processor_cstate_first_run_checks() before calling acpi_processor_get_power_info(). 3) squash the commit 9d68320b2bca (ACPI: processor: idle: Fix function defined but not used warning) into this change. 4) use for_each_possible_cpu(cpu) to scan all possible cpus. Signed-off-by: Huisong Li Tested-by: Borislav Petkov (AMD) [ rjw: New comment edits, changelog tweak ] Link: https://patch.msgid.link/20251223100914.2407069-2-lihuisong@huawei.com Signed-off-by: Rafael J. Wysocki

Merge back ACPI processor driver changes for 6.19

2025-11-26T12:56:30+00:00