kernel/linux.git/drivers/base/cpu.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

driver core: cpu: Convert /sys/devices/system/cpu/isolated to use HK_TYPE_DOMAIN_BOOT

2026-02-03T14:23:33+00:00

Make sure /sys/devices/system/cpu/isolated only prints what was passed through the isolcpus= parameter before HK_TYPE_DOMAIN will also integrate cpuset isolated partitions. Signed-off-by: Frederic Weisbecker Cc: Danilo Krummrich Cc: Greg Kroah-Hartman Cc: Marco Crivellari Cc: Michal Hocko Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Tejun Heo Cc: Thomas Gleixner Cc: Vlastimil Babka Cc: Waiman Long

tick/nohz: Expose housekeeping CPUs in sysfs

2025-11-26T14:20:51+00:00

Expose the current system-defined list of housekeeping CPUs in a new sysfs file: /sys/devices/system/cpu/housekeeping. This provides userspace performance tuning tools and resource managers with a canonical, reliable method to accurately identify the cores responsible for essential kernel maintenance workloads (RCU, timer callbacks, and unbound workqueues). Currently, tooling must manually calculate the housekeeping set by parsing complex kernel boot parameters (like isolcpus= and nohz_full=) and system topology, which is prone to error. This dedicated file simplifies the configuration of low-latency workloads. Signed-off-by: Aaron Tomlin Link: https://patch.msgid.link/20251011012853.7539-2-atomlin@atomlin.com Signed-off-by: Greg Kroah-Hartman

tick/nohz: avoid showing '(null)' if nohz_full= not set

2025-11-26T14:20:49+00:00

In the context of CONFIG_NO_HZ_FULL=y, tick_nohz_full_mask (of type cpumask_var_t) is initialised to 0. Memory is only allocated to the cpumask data structure, in tick_nohz_full_setup(), when Linux kernel boot-time parameter "nohz_full=" is correctly specified (see housekeeping_setup()). If "nohz_full=" is not set and an attempt is made to read /sys/devices/system/cpu/nohz_full, '(null)' can be displayed: ❯ cat /sys/devices/system/cpu/nohz_full (null) This patch changes the output to print a newline (or 0x0A) instead of '(null)', making it consistent with print_cpus_isolated() behaviour. Signed-off-by: Aaron Tomlin Link: https://patch.msgid.link/20251011011830.6670-3-atomlin@atomlin.com Signed-off-by: Greg Kroah-Hartman

sysfs/cpu: Use DEVICE_ATTR_RO for nohz_full attribute

2025-11-26T14:20:49+00:00

The /sys/devices/system/cpu/nohz_full file is a read-only attribute that reports the CPUs configured for tickless operation (CONFIG_NO_HZ_FULL=y). The current definition uses the generic DEVICE_ATTR macro, which unnecessarily requires specifying the file mode (0444) and a NULL store operation pointer. This patch converts the definition to use the dedicated DEVICE_ATTR_RO macro. This correctly expresses the read-only nature of the attribute, removes the redundant mode field, and simplifies the code. As a related cleanup, rename the show function from print_cpus_nohz_full() to the standard nohz_full_show() for consistency with common sysfs attribute naming conventions. Signed-off-by: Aaron Tomlin Link: https://patch.msgid.link/20251011011830.6670-2-atomlin@atomlin.com Signed-off-by: Greg Kroah-Hartman

Merge 6.17-rc6 into driver-core-next

2025-09-15T06:26:05+00:00

We need the driver core fixes in here to build on top of. Signed-off-by: Greg Kroah-Hartman

drivers: base: fix "publically"->"publicly"

2025-09-06T17:52:17+00:00

Trivial fix to spelling mistake in comment text. Signed-off-by: Xichao Zhao Link: https://lore.kernel.org/r/20250827114021.476668-1-zhao.xichao@vivo.com Signed-off-by: Greg Kroah-Hartman

x86/vmscape: Enable the mitigation

2025-08-14T17:37:33+00:00

Enable the previously added mitigation for VMscape. Add the cmdline vmscape={off|ibpb|force} and sysfs reporting. Signed-off-by: Pawan Gupta Signed-off-by: Dave Hansen Reviewed-by: Borislav Petkov (AMD) Reviewed-by: Dave Hansen

x86/bugs: Add a Transient Scheduler Attacks mitigation

2025-06-17T15:17:02+00:00

Add the required features detection glue to bugs.c et all in order to support the TSA mitigation. Co-developed-by: Kim Phillips Signed-off-by: Kim Phillips Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Pawan Gupta