wireguard-linux/kernel, branch devel

Merge tag 'pm-6.19-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2026-01-02T20:35:29Z

Pull power management fix from Rafael Wysocki: "Fix a recent regression that affects system suspend testing at the 'core' level (Rafael Wysocki)" * tag 'pm-6.19-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: PM: sleep: Fix suspend_test() at the TEST_CORE level

Merge tag 'mm-hotfixes-stable-2025-12-28-21-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2025-12-29T19:40:38Z

Pull misc fixes from Andrew Morton: "27 hotfixes. 12 are cc:stable, 18 are MM. There's a patch series from Jiayuan Chen which fixes some issues with KASAN and vmalloc. Apart from that it's the usual shower of singletons - please see the respective changelogs for details" * tag 'mm-hotfixes-stable-2025-12-28-21-50' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (27 commits) mm/ksm: fix pte_unmap_unlock of wrong address in break_ksm_pmd_entry mm/page_owner: fix memory leak in page_owner_stack_fops->release() mm/memremap: fix spurious large folio warning for FS-DAX MAINTAINERS: notify the "Device Memory" community of memory hotplug changes sparse: update MAINTAINERS info mm/page_alloc: report 1 as zone_batchsize for !CONFIG_MMU mm: consider non-anon swap cache folios in folio_expected_ref_count() rust: maple_tree: rcu_read_lock() in destructor to silence lockdep mm: memcg: fix unit conversion for K() macro in OOM log mm: fixup pfnmap memory failure handling to use pgoff tools/mm/page_owner_sort: fix timestamp comparison for stable sorting selftests/mm: fix thread state check in uffd-unit-tests kernel/kexec: fix IMA when allocation happens in CMA area kernel/kexec: change the prototype of kimage_map_segment() MAINTAINERS: add ABI headers to KHO and LIVE UPDATE .mailmap: remove one of the entries for WangYuli mm/damon/vaddr: fix missing pte_unmap_unlock in damos_va_migrate_pmd_entry() MAINTAINERS: update one straggling entry for Bartosz Golaszewski mm/page_alloc: change all pageblocks migrate type on coalescing mm: leafops.h: correct kernel-doc function param. names ...

Merge tag 'sched_ext-for-6.19-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext

2025-12-29T01:21:36Z

Pull sched_ext fixes from Tejun Heo: - Fix uninitialized @ret on alloc_percpu() failure leading to ERR_PTR(0) - Fix PREEMPT_RT warning when bypass load balancer sends IPI to offline CPU by using resched_cpu() instead of resched_curr() - Fix comment referring to renamed function - Update scx_show_state.py for scx_root and scx_aborting changes * tag 'sched_ext-for-6.19-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext: tools/sched_ext: update scx_show_state.py for scx_aborting change tools/sched_ext: fix scx_show_state.py for scx_root change sched_ext: Use the resched_cpu() to replace resched_curr() in the bypass_lb_node() sched_ext: Fix some comments in ext.c sched_ext: fix uninitialized ret on alloc_percpu() failure

Merge tag 'cgroup-for-6.19-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2025-12-29T01:19:09Z

Pull cgroup fix from Tejun Heo: - Fix a spurious cpuset warning when disabling remote partition after CPU hotplug leaves subpartitions_cpus empty. Guard the warning and invalidate affected partitions. * tag 'cgroup-for-6.19-rc3-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cpuset: fix warning when disabling remote partition

PM: sleep: Fix suspend_test() at the TEST_CORE level

2025-12-28T12:01:39Z

Commit a10ad1b10402 ("PM: suspend: Make pm_test delay interruptible by wakeup events") replaced mdelay() in suspend_test() with msleep() which does not work at the TEST_CORE test level that calls suspend_test() while running on one CPU with interrupts off. Address this by making suspend_test() check if the test level is suitable for using msleep() and use mdelay() otherwise. Fixes: a10ad1b10402 ("PM: suspend: Make pm_test delay interruptible by wakeup events") Reported-by: Sebastian Reichel Closes: https://lore.kernel.org/linux-pm/aUsAk0k1N9hw8IkY@venus/ Signed-off-by: Rafael J. Wysocki Tested-by: Sebastian Reichel Link: https://patch.msgid.link/6251576.lOV4Wx5bFT@rafael.j.wysocki

Merge tag 'efi-fixes-for-v6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

2025-12-26T21:37:11Z

Pull EFI fixes from Ard Biesheuvel: "A couple of fixes for EFI regressions introduced this cycle: - Make EDID handling in the EFI stub mixed mode safe - Ensure that efi_mm.user_ns has a sane value - this is needed now that EFI runtime calls are preemptible on arm64" * tag 'efi-fixes-for-v6.19-1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi: kthread: Warn if mm_struct lacks user_ns in kthread_use_mm() arm64: efi: Fix NULL pointer dereference by initializing user_ns efi/libstub: gop: Fix EDID support in mixed-mode

kthread: Warn if mm_struct lacks user_ns in kthread_use_mm()

2025-12-24T20:32:58Z

Add a WARN_ON_ONCE() check to detect mm_struct instances that are missing user_ns initialization when passed to kthread_use_mm(). When a kthread adopts an mm via kthread_use_mm(), LSM hooks and capability checks may access current->mm->user_ns for credential validation. If user_ns is NULL, this leads to a NULL pointer dereference crash. This was observed with efi_mm on arm64, where commit a5baf582f4c0 ("arm64/efi: Call EFI runtime services without disabling preemption") introduced kthread_use_mm(&efi_mm), but efi_mm lacked user_ns initialization, causing crashes during /proc access. Adding this warning helps catch similar bugs early during development rather than waiting for hard-to-debug NULL pointer crashes in production. Signed-off-by: Breno Leitao Acked-by: Rik van Riel Signed-off-by: Ard Biesheuvel

kernel/kexec: fix IMA when allocation happens in CMA area

2025-12-23T19:23:14Z

*** Bug description *** When I tested kexec with the latest kernel, I ran into the following warning: [ 40.712410] ------------[ cut here ]------------ [ 40.712576] WARNING: CPU: 2 PID: 1562 at kernel/kexec_core.c:1001 kimage_map_segment+0x144/0x198 [...] [ 40.816047] Call trace: [ 40.818498] kimage_map_segment+0x144/0x198 (P) [ 40.823221] ima_kexec_post_load+0x58/0xc0 [ 40.827246] __do_sys_kexec_file_load+0x29c/0x368 [...] [ 40.855423] ---[ end trace 0000000000000000 ]--- *** How to reproduce *** This bug is only triggered when the kexec target address is allocated in the CMA area. If no CMA area is reserved in the kernel, use the "cma=" option in the kernel command line to reserve one. *** Root cause *** The commit 07d24902977e ("kexec: enable CMA based contiguous allocation") allocates the kexec target address directly on the CMA area to avoid copying during the jump. In this case, there is no IND_SOURCE for the kexec segment. But the current implementation of kimage_map_segment() assumes that IND_SOURCE pages exist and map them into a contiguous virtual address by vmap(). *** Solution *** If IMA segment is allocated in the CMA area, use its page_address() directly. Link: https://lkml.kernel.org/r/20251216014852.8737-2-piliu@redhat.com Fixes: 07d24902977e ("kexec: enable CMA based contiguous allocation") Signed-off-by: Pingfan Liu Acked-by: Baoquan He Cc: Alexander Graf Cc: Steven Chen Cc: Mimi Zohar Cc: Roberto Sassu Cc: Signed-off-by: Andrew Morton

kernel/kexec: change the prototype of kimage_map_segment()

2025-12-23T19:23:13Z

The kexec segment index will be required to extract the corresponding information for that segment in kimage_map_segment(). Additionally, kexec_segment already holds the kexec relocation destination address and size. Therefore, the prototype of kimage_map_segment() can be changed. Link: https://lkml.kernel.org/r/20251216014852.8737-1-piliu@redhat.com Fixes: 07d24902977e ("kexec: enable CMA based contiguous allocation") Signed-off-by: Pingfan Liu Acked-by: Baoquan He Cc: Mimi Zohar Cc: Roberto Sassu Cc: Alexander Graf Cc: Steven Chen Cc: Signed-off-by: Andrew Morton

sched_ext: Use the resched_cpu() to replace resched_curr() in the bypass_lb_node()

2025-12-23T03:51:51Z

For the PREEMPT_RT kernels, the scx_bypass_lb_timerfn() running in the preemptible per-CPU ktimer kthread context, this means that the following scenarios will occur(for x86 platform): cpu1 cpu2 ktimer kthread: ->scx_bypass_lb_timerfn ->bypass_lb_node ->for_each_cpu(cpu, resched_mask) migration/1: by preempt by migration/2: multi_cpu_stop() multi_cpu_stop() ->take_cpu_down() ->__cpu_disable() ->set cpu1 offline ->rq1 = cpu_rq(cpu1) ->resched_curr(rq1) ->smp_send_reschedule(cpu1) ->native_smp_send_reschedule(cpu1) ->if(unlikely(cpu_is_offline(cpu))) { WARN(1, "sched: Unexpected reschedule of offline CPU#%d!\n", cpu); return; } This commit therefore use the resched_cpu() to replace resched_curr() in the bypass_lb_node() to avoid send-ipi to offline CPUs. Signed-off-by: Zqiang Reviewed-by: Andrea Righi Signed-off-by: Tejun Heo