kernel.git/arch/x86/kernel/cpu, branch master

Merge tag 'hyperv-fixes-signed-20260319' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

2026-03-20T16:18:22Z

Pull Hyper-V fixes from Wei Liu: - Fix ARM64 MSHV support (Anirudh Rayabharam) - Fix MSHV driver memory handling issues (Stanislav Kinsburskii) - Update maintainers for Hyper-V DRM driver (Saurabh Sengar) - Misc clean up in MSHV crashdump code (Ard Biesheuvel, Uros Bizjak) - Minor improvements to MSHV code (Mukesh R, Wei Liu) - Revert not yet released MSHV scrub partition hypercall (Wei Liu) * tag 'hyperv-fixes-signed-20260319' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: mshv: Fix error handling in mshv_region_pin MAINTAINERS: Update maintainers for Hyper-V DRM driver mshv: Fix use-after-free in mshv_map_user_memory error path mshv: pass struct mshv_user_mem_region by reference x86/hyperv: Use any general-purpose register when saving %cr2 and %cr8 x86/hyperv: Use current_stack_pointer to avoid asm() in hv_hvcrash_ctxt_save() x86/hyperv: Save segment registers directly to memory in hv_hvcrash_ctxt_save() x86/hyperv: Use __naked attribute to fix stackless C function Revert "mshv: expose the scrub partition hypercall" mshv: add arm64 support for doorbell & intercept SINTs mshv: refactor synic init and cleanup x86/hyperv: print out reserved vectors in hexadecimal

x86/resctrl: Fix SNC detection

2026-03-04T15:35:09Z

Now that the x86 topology code has a sensible nodes-per-package measure, that does not depend on the online status of CPUs, use this to divinate the SNC mode. Note that when Cluster on Die (CoD) is configured on older systems this will also show multiple NUMA nodes per package. Intel Resource Director Technology is incomaptible with CoD. Print a warning and do not use the fixup MSR_RMID_SNC_CONFIG. Signed-off-by: Tony Luck Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Ingo Molnar Tested-by: Zhang Rui Tested-by: Chen Yu Link: https://patch.msgid.link/aaCxbbgjL6OZ6VMd@agluck-desk3 Link: https://patch.msgid.link/20260303110100.367976706@infradead.org

x86/topo: Add topology_num_nodes_per_package()

2026-03-04T15:35:08Z

Use the MADT and SRAT table data to compute __num_nodes_per_package. Specifically, SRAT has already been parsed in x86_numa_init(), which is called before acpi_boot_init() which parses MADT. So both are available in topology_init_possible_cpus(). This number is useful to divinate the various Intel CoD/SNC and AMD NPS modes, since the platforms are failing to provide this otherwise. Doing it this way is independent of the number of online CPUs and other such shenanigans. Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Ingo Molnar Tested-by: Tony Luck Tested-by: K Prateek Nayak Tested-by: Zhang Rui Tested-by: Chen Yu Tested-by: Kyle Meyer Link: https://patch.msgid.link/20260303110100.004091624@infradead.org

x86/hyperv: print out reserved vectors in hexadecimal

2026-02-24T17:10:44Z

Signed-off-by: Wei Liu

Convert more 'alloc_obj' cases to default GFP_KERNEL arguments

2026-02-22T04:03:00Z

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_flex' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51Z

This is the exact same thing as the 'alloc_obj()' version, only much smaller because there are a lot fewer users of the *alloc_flex() interface. As with alloc_obj() version, this was done entirely with mindless brute force, using the same script, except using 'flex' in the pattern rather than 'objs*'. Signed-off-by: Linus Torvalds

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

2026-02-22T01:09:51Z

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

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28Z

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

Merge tag 'hyperv-next-signed-20260218' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux

2026-02-20T16:48:31Z

Pull Hyper-V updates from Wei Liu: - Debugfs support for MSHV statistics (Nuno Das Neves) - Support for the integrated scheduler (Stanislav Kinsburskii) - Various fixes for MSHV memory management and hypervisor status handling (Stanislav Kinsburskii) - Expose more capabilities and flags for MSHV partition management (Anatol Belski, Muminul Islam, Magnus Kulke) - Miscellaneous fixes to improve code quality and stability (Carlos López, Ethan Nelson-Moore, Li RongQing, Michael Kelley, Mukesh Rathor, Purna Pavan Chandra Aekkaladevi, Stanislav Kinsburskii, Uros Bizjak) - PREEMPT_RT fixes for vmbus interrupts (Jan Kiszka) * tag 'hyperv-next-signed-20260218' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux: (34 commits) mshv: Handle insufficient root memory hypervisor statuses mshv: Handle insufficient contiguous memory hypervisor status mshv: Introduce hv_deposit_memory helper functions mshv: Introduce hv_result_needs_memory() helper function mshv: Add SMT_ENABLED_GUEST partition creation flag mshv: Add nested virtualization creation flag Drivers: hv: vmbus: Simplify allocation of vmbus_evt mshv: expose the scrub partition hypercall mshv: Add support for integrated scheduler mshv: Use try_cmpxchg() instead of cmpxchg() x86/hyperv: Fix error pointer dereference x86/hyperv: Reserve 3 interrupt vectors used exclusively by MSHV Drivers: hv: vmbus: Use kthread for vmbus interrupts on PREEMPT_RT x86/hyperv: Remove ASM_CALL_CONSTRAINT with VMMCALL insn x86/hyperv: Use savesegment() instead of inline asm() to save segment registers mshv: fix SRCU protection in irqfd resampler ack handler mshv: make field names descriptive in a header struct x86/hyperv: Update comment in hyperv_cleanup() mshv: clear eventfd counter on irqfd shutdown x86/hyperv: Use memremap()/memunmap() instead of ioremap_cache()/iounmap() ...

Merge tag 'mm-stable-2026-02-18-19-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-02-19T04:50:32Z

Pull more MM updates from Andrew Morton: - "mm/vmscan: fix demotion targets checks in reclaim/demotion" fixes a couple of issues in the demotion code - pages were failed demotion and were finding themselves demoted into disallowed nodes (Bing Jiao) - "Remove XA_ZERO from error recovery of dup_mmap()" fixes a rare mapledtree race and performs a number of cleanups (Liam Howlett) - "mm: add bitmap VMA flag helpers and convert all mmap_prepare to use them" implements a lot of cleanups following on from the conversion of the VMA flags into a bitmap (Lorenzo Stoakes) - "support batch checking of references and unmapping for large folios" implements batching to greatly improve the performance of reclaiming clean file-backed large folios (Baolin Wang) - "selftests/mm: add memory failure selftests" does as claimed (Miaohe Lin) * tag 'mm-stable-2026-02-18-19-48' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (36 commits) mm/page_alloc: clear page->private in free_pages_prepare() selftests/mm: add memory failure dirty pagecache test selftests/mm: add memory failure clean pagecache test selftests/mm: add memory failure anonymous page test mm: rmap: support batched unmapping for file large folios arm64: mm: implement the architecture-specific clear_flush_young_ptes() arm64: mm: support batch clearing of the young flag for large folios arm64: mm: factor out the address and ptep alignment into a new helper mm: rmap: support batched checks of the references for large folios tools/testing/vma: add VMA userland tests for VMA flag functions tools/testing/vma: separate out vma_internal.h into logical headers tools/testing/vma: separate VMA userland tests into separate files mm: make vm_area_desc utilise vma_flags_t only mm: update all remaining mmap_prepare users to use vma_flags_t mm: update shmem_[kernel]_file_*() functions to use vma_flags_t mm: update secretmem to use VMA flags on mmap_prepare mm: update hugetlbfs to use VMA flags on mmap_prepare mm: add basic VMA flag operation helper functions tools: bitmap: add missing bitmap_[subset(), andnot()] mm: add mk_vma_flags() bitmap flag macro helper ...