lwn.git/drivers/devfreq, branch master

PM / devfreq: tegra30-devfreq: add support for Tegra114

2026-04-03T18:15:39+00:00

Lets add Tegra114 support to activity monitor device as a preparation to upcoming EMC controller support. Signed-off-by: Svyatoslav Ryhel Reviewed-by: Mikko Perttunen Acked-by: Dmitry Osipenko Acked-by: MyungJoo Ham Signed-off-by: Chanwoo Choi Link: https://lore.kernel.org/lkml/20260126185423.77786-1-clamor95@gmail.com/

PM / devfreq: use _visible attribute to replace create/remove_sysfs_files()

2026-04-03T18:15:38+00:00

Previously, non-generic attributes (polling_interval, timer) used separate create/delete logic, leading to race conditions during concurrent access in creation/deletion. Multi-threaded operations also caused inconsistencies between governor capabilities and attribute states. 1.Use is_visible + sysfs_update_group() to unify management of these attributes, eliminating creation/deletion races. 2.Add locks and validation to these attributes, ensuring consistency between current governor capabilities and attribute operations in multi-threaded environments. Reviewed-by: Jonathan Cameron Reviewed-by: Jie Zhan Signed-off-by: Pengjie Zhang Signed-off-by: Chanwoo Choi Link: https://www.spinics.net/lists/kernel/msg5967745.html

PM / devfreq: Remove unneeded casting for HZ_PER_KHZ

2026-04-03T18:15:38+00:00

HZ_PER_KHZ is defined as UL (unsigned long), no need to repeat that. Signed-off-by: Andy Shevchenko Reviewed-by: Lifeng Zheng Acked-by: MyungJoo Ham Signed-off-by: Chanwoo Choi Link: https://lore.kernel.org/lkml/20260114093115.276818-1-andriy.shevchenko@linux.intel.com/

Convert more 'alloc_obj' cases to default GFP_KERNEL arguments

2026-02-22T04:03:00+00:00

This converts some of the visually simpler cases that have been split over multiple lines. I only did the ones that are easy to verify the resulting diff by having just that final GFP_KERNEL argument on the next line. Somebody should probably do a proper coccinelle script for this, but for me the trivial script actually resulted in an assertion failure in the middle of the script. I probably had made it a bit _too_ trivial. So after fighting that far a while I decided to just do some of the syntactically simpler cases with variations of the previous 'sed' scripts. The more syntactically complex multi-line cases would mostly really want whitespace cleanup anyway. Signed-off-by: Linus Torvalds

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

PM / devfreq: Fix typo in DFSO_DOWNDIFFERENTIAL macro name

2025-11-26T04:58:59+00:00

Correct the spelling error in the DFSO_DOWNDIFFERENTIAL macro definition and update the corresponding variable assignment. The macro was previously misspelled as DFSO_DOWNDIFFERENCTIAL. This change ensures consistent and correct spelling throughout the simpleondemand governor implementation. Signed-off-by: Riwen Lu Signed-off-by: Chanwoo Choi Link: https://patchwork.kernel.org/project/linux-pm/patch/20251118032339.2799230-1-luriwen@kylinos.cn/

PM / devfreq: tegra30: use min to simplify actmon_cpu_to_emc_rate

2025-11-23T15:02:07+00:00

Use min() to improve the readability of actmon_cpu_to_emc_rate() and remove any unnecessary curly braces. Reviewed-by: Dmitry Osipenko Signed-off-by: Thorsten Blum Acked-by: Thierry Reding Signed-off-by: Chanwoo Choi Link: https://patchwork.kernel.org/project/linux-pm/patch/20251112172121.3741-2-thorsten.blum@linux.dev/

PM / devfreq: hisi: Fix potential UAF in OPP handling

2025-11-23T15:02:07+00:00

Ensure all required data is acquired before calling dev_pm_opp_put(opp) to maintain correct resource acquisition and release order. Fixes: 7da2fdaaa1e6 ("PM / devfreq: Add HiSilicon uncore frequency scaling driver") Signed-off-by: Pengjie Zhang Reviewed-by: Jie Zhan Acked-by: Chanwoo Choi Signed-off-by: Chanwoo Choi Link: https://patchwork.kernel.org/project/linux-pm/patch/20250915062135.748653-1-zhangpengjie2@huawei.com/

PM / devfreq: Move governor.h to a public header location

2025-11-23T15:02:01+00:00

Some device drivers (and out-of-tree modules) might want to define device-specific device governors. Rather than restricting all of them to be a part of drivers/devfreq/ (which is not possible for out-of-tree drivers anyway) move governor.h to include/linux/devfreq-governor.h and update all drivers to use it. The devfreq_cpu_data is only used internally, by the passive governor, so it is moved to the driver source rather than being a part of the public interface. Reported-by: Robie Basak Acked-by: Jon Hunter Signed-off-by: Dmitry Baryshkov Reviewed-by: Bjorn Andersson Acked-by: MyungJoo Ham Signed-off-by: Chanwoo Choi Link: https://patchwork.kernel.org/project/linux-pm/patch/20251030-governor-public-v2-1-432a11a9975a@oss.qualcomm.com/