Merge 7.0 Kbuild changes into kbuild-fixes

kbuild-fixes needs to be based on 6.19 to apply some fixes for

62089b804895 ("kbuild: rpm-pkg: Generate debuginfo package manually")

which landed in 6.

Merge 7.0 Kbuild changes into kbuild-fixes

kbuild-fixes needs to be based on 6.19 to apply some fixes for

62089b804895 ("kbuild: rpm-pkg: Generate debuginfo package manually")

which landed in 6.19-rc1 but the new material of 7.0 needs fixes merged
as well.

Signed-off-by: Nathan Chancellor <nathan@kernel.org>

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Merge tag 'kbuild-7.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux

Pull Kbuild/Kconfig updates from Nathan Chancellor:
"Kbuild:

- Drop '*_probe' pattern from modpost section

Merge tag 'kbuild-7.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux

Pull Kbuild/Kconfig updates from Nathan Chancellor:
"Kbuild:

- Drop '*_probe' pattern from modpost section check allowlist, which
hid legitimate warnings (Johan Hovold)

- Disable -Wtype-limits altogether, instead of enabling at W=2
(Vincent Mailhol)

- Improve UAPI testing to skip testing headers that require a libc
when CONFIG_CC_CAN_LINK is not set, opening up testing of headers
with no libc dependencies to more environments (Thomas Weißschuh)

- Update gendwarfksyms documentation with required dependencies
(Jihan LIN)

- Reject invalid LLVM= values to avoid unintentionally falling back
to system toolchain (Thomas Weißschuh)

- Add a script to help run the kernel build process in a container
for consistent environments and testing (Guillaume Tucker)

- Simplify kallsyms by getting rid of the relative base (Ard
Biesheuvel)

- Performance and usability improvements to scripts/make_fit.py
(Simon Glass)

- Minor various clean ups and fixes

Kconfig:

- Move XPM icons to individual files, clearing up GTK deprecation
warnings (Rostislav Krasny)

- Support

depends on FOO if BAR

as syntactic sugar for

depends on FOO || !BAR

(Nicolas Pitre, Graham Roff)

- Refactor merge_config.sh to use awk over shell/sed/grep,
dramatically speeding up processing large number of config
fragments (Anders Roxell, Mikko Rapeli)"

* tag 'kbuild-7.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux: (39 commits)
kbuild: remove dependency of run-command on config
scripts/make_fit: Compress dtbs in parallel
scripts/make_fit: Support a few more parallel compressors
kbuild: Support a FIT_EXTRA_ARGS environment variable
scripts/make_fit: Move dtb processing into a function
scripts/make_fit: Support an initial ramdisk
scripts/make_fit: Speed up operation
rust: kconfig: Don't require RUST_IS_AVAILABLE for rustc-option
MAINTAINERS: Add scripts/install.sh into Kbuild entry
modpost: Amend ppc64 save/restfpr symnames for -Os build
MIPS: tools: relocs: Ship a definition of R_MIPS_PC32
streamline_config.pl: remove superfluous exclamation mark
kbuild: dummy-tools: Add python3
scripts: kconfig: merge_config.sh: warn on duplicate input files
scripts: kconfig: merge_config.sh: use awk in checks too
scripts: kconfig: merge_config.sh: refactor from shell/sed/grep to awk
kallsyms: Get rid of kallsyms relative base
mips: Add support for PC32 relocations in vmlinux
Documentation: dev-tools: add container.rst page
scripts: add tool to run containerized builds
...

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Merge tag 'kvm-x86-pmu-6.20' of https://github.com/kvm-x86/linux into HEAD

KVM mediated PMU support for 6.20

Add support for mediated PMUs, where KVM gives the guest full ownership of PMU
hardware

Merge tag 'kvm-x86-pmu-6.20' of https://github.com/kvm-x86/linux into HEAD

KVM mediated PMU support for 6.20

Add support for mediated PMUs, where KVM gives the guest full ownership of PMU
hardware (contexted switched around the fastpath run loop) and allows direct
access to data MSRs and PMCs (restricted by the vPMU model), but intercepts
access to control registers, e.g. to enforce event filtering and to prevent the
guest from profiling sensitive host state.

To keep overall complexity reasonable, mediated PMU usage is all or nothing
for a given instance of KVM (controlled via module param). The Mediated PMU
is disabled default, partly to maintain backwards compatilibity for existing
setup, partly because there are tradeoffs when running with a mediated PMU that
may be non-starters for some use cases, e.g. the host loses the ability to
profile guests with mediated PMUs, the fastpath run loop is also a blind spot,
entry/exit transitions are more expensive, etc.

Versus the emulated PMU, where KVM is "just another perf user", the mediated
PMU delivers more accurate profiling and monitoring (no risk of contention and
thus dropped events), with significantly less overhead (fewer exits and faster
emulation/programming of event selectors) E.g. when running Specint-2017 on
a single-socket Sapphire Rapids with 56 cores and no-SMT, and using perf from
within the guest:

Perf command:
a. basic-sampling: perf record -F 1000 -e 6-instructions -a --overwrite
b. multiplex-sampling: perf record -F 1000 -e 10-instructions -a --overwrite

Guest performance overhead:
---------------------------------------------------------------------------
| Test case | emulated vPMU | all passthrough | passthrough with |
| | | | event filters |
---------------------------------------------------------------------------
| basic-sampling | 33.62% | 4.24% | 6.21% |
---------------------------------------------------------------------------
| multiplex-sampling | 79.32% | 7.34% | 10.45% |
---------------------------------------------------------------------------

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Merge tag 'sched-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler updates from Ingo Molnar:
"Scheduler Kconfig space updates:

- Further consolidate confi

Merge tag 'sched-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler updates from Ingo Molnar:
"Scheduler Kconfig space updates:

- Further consolidate configurable preemption modes (Peter Zijlstra)

Reduce the number of architectures that are allowed to offer
PREEMPT_NONE and PREEMPT_VOLUNTARY, reducing the number of
preemption models from four to just two: 'full' and 'lazy' on
up-to-date architectures (arm64, loongarch, powerpc, riscv, s390,
x86).

None and voluntary are only available as legacy features on
platforms that don't implement lazy preemption yet, or which don't
even support preemption.

The goal is to eventually remove cond_resched() and voluntary
preemption altogether.

RSEQ based 'scheduler time slice extension' support (Thomas Gleixner
and Peter Zijlstra):

This allows a thread to request a time slice extension when it enters
a critical section to avoid contention on a resource when the thread
is scheduled out inside of the critical section.

- Add fields and constants for time slice extension
- Provide static branch for time slice extensions
- Add statistics for time slice extensions
- Add prctl() to enable time slice extensions
- Implement sys_rseq_slice_yield()
- Implement syscall entry work for time slice extensions
- Implement time slice extension enforcement timer
- Reset slice extension when scheduled
- Implement rseq_grant_slice_extension()
- entry: Hook up rseq time slice extension
- selftests: Implement time slice extension test
- Allow registering RSEQ with slice extension
- Move slice_ext_nsec to debugfs
- Lower default slice extension
- selftests/rseq: Add rseq slice histogram script

Scheduler performance/scalability improvements:

- Update rq->avg_idle when a task is moved to an idle CPU, which
improves the scalability of various workloads (Shubhang Kaushik)

- Reorder fields in 'struct rq' for better caching (Blake Jones)

- Fair scheduler SMP NOHZ balancing code speedups (Shrikanth Hegde):
- Move checking for nohz cpus after time check
- Change likelyhood of nohz.nr_cpus
- Remove nohz.nr_cpus and use weight of cpumask instead

- Avoid false sharing for sched_clock_irqtime (Wangyang Guo)

- Cleanups (Yury Norov):
- Drop useless cpumask_empty() in find_energy_efficient_cpu()
- Simplify task_numa_find_cpu()
- Use cpumask_weight_and() in sched_balance_find_dst_group()

DL scheduler updates:

- Add a deadline server for sched_ext tasks (by Andrea Righi and Joel
Fernandes, with fixes by Peter Zijlstra)

RT scheduler updates:

- Skip currently executing CPU in rto_next_cpu() (Chen Jinghuang)

Entry code updates and performance improvements (Jinjie Ruan)

This is part of the scheduler tree in this cycle due to inter-
dependencies with the RSEQ based time slice extension work:

- Remove unused syscall argument from syscall_trace_enter()
- Rework syscall_exit_to_user_mode_work() for architecture reuse
- Add arch_ptrace_report_syscall_entry/exit()
- Inline syscall_exit_work() and syscall_trace_enter()

Scheduler core updates (Peter Zijlstra):

- Rework sched_class::wakeup_preempt() and rq_modified_*()
- Avoid rq->lock bouncing in sched_balance_newidle()
- Rename rcu_dereference_check_sched_domain() =>
rcu_dereference_sched_domain()
- <linux/compiler_types.h>: Add the __signed_scalar_typeof() helper

Fair scheduler updates/refactoring (Peter Zijlstra and Ingo Molnar):

- Fold the sched_avg update
- Change rcu_dereference_check_sched_domain() to rcu-sched
- Switch to rcu_dereference_all()
- Remove superfluous rcu_read_lock()
- Limit hrtick work
- Join two #ifdef CONFIG_FAIR_GROUP_SCHED blocks
- Clean up comments in 'struct cfs_rq'
- Separate se->vlag from se->vprot
- Rename cfs_rq::avg_load to cfs_rq::sum_weight
- Rename cfs_rq::avg_vruntime to ::sum_w_vruntime & helper functions
- Introduce and use the vruntime_cmp() and vruntime_op() wrappers for
wrapped-signed aritmetics
- Sort out 'blocked_load*' namespace noise

Scheduler debugging code updates:

- Export hidden tracepoints to modules (Gabriele Monaco)

- Convert copy_from_user() + kstrtouint() to kstrtouint_from_user()
(Fushuai Wang)

- Add assertions to QUEUE_CLASS (Peter Zijlstra)

- hrtimer: Fix tracing oddity (Thomas Gleixner)

Misc fixes and cleanups:

- Re-evaluate scheduling when migrating queued tasks out of throttled
cgroups (Zicheng Qu)

- Remove task_struct->faults_disabled_mapping (Christoph Hellwig)

- Fix math notation errors in avg_vruntime comment (Zhan Xusheng)

- sched/cpufreq: Use %pe format for PTR_ERR() printing
(zenghongling)"

* tag 'sched-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (64 commits)
sched: Re-evaluate scheduling when migrating queued tasks out of throttled cgroups
sched/cpufreq: Use %pe format for PTR_ERR() printing
sched/rt: Skip currently executing CPU in rto_next_cpu()
sched/clock: Avoid false sharing for sched_clock_irqtime
selftests/sched_ext: Add test for DL server total_bw consistency
selftests/sched_ext: Add test for sched_ext dl_server
sched/debug: Fix dl_server (re)start conditions
sched/debug: Add support to change sched_ext server params
sched_ext: Add a DL server for sched_ext tasks
sched/debug: Stop and start server based on if it was active
sched/debug: Fix updating of ppos on server write ops
sched/deadline: Clear the defer params
entry: Inline syscall_exit_work() and syscall_trace_enter()
entry: Add arch_ptrace_report_syscall_entry/exit()
entry: Rework syscall_exit_to_user_mode_work() for architecture reuse
entry: Remove unused syscall argument from syscall_trace_enter()
sched: remove task_struct->faults_disabled_mapping
sched: Update rq->avg_idle when a task is moved to an idle CPU
selftests/rseq: Add rseq slice histogram script
hrtimer: Fix trace oddity
...

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Merge tag 'perf-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull performance event updates from Ingo Molnar:
"x86 PMU driver updates:

- Add support for the core PM

Merge tag 'perf-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull performance event updates from Ingo Molnar:
"x86 PMU driver updates:

- Add support for the core PMU for Intel Diamond Rapids (DMR) CPUs
(Dapeng Mi)

Compared to previous iterations of the Intel PMU code, there's been
a lot of changes, which center around three main areas:

- Introduce the OFF-MODULE RESPONSE (OMR) facility to replace the
Off-Core Response (OCR) facility

- New PEBS data source encoding layout

- Support the new "RDPMC user disable" feature

- Likewise, a large series adds uncore PMU support for Intel Diamond
Rapids (DMR) CPUs (Zide Chen)

This centers around these four main areas:

- DMR may have two Integrated I/O and Memory Hub (IMH) dies,
separate from the compute tile (CBB) dies. Each CBB and each IMH
die has its own discovery domain.

- Unlike prior CPUs that retrieve the global discovery table
portal exclusively via PCI or MSR, DMR uses PCI for IMH PMON
discovery and MSR for CBB PMON discovery.

- DMR introduces several new PMON types: SCA, HAMVF, D2D_ULA, UBR,
PCIE4, CRS, CPC, ITC, OTC, CMS, and PCIE6.

- IIO free-running counters in DMR are MMIO-based, unlike SPR.

- Also add support for Add missing PMON units for Intel Panther Lake,
and support Nova Lake (NVL), which largely maps to Panther Lake.
(Zide Chen)

- KVM integration: Add support for mediated vPMUs (by Kan Liang and
Sean Christopherson, with fixes and cleanups by Peter Zijlstra,
Sandipan Das and Mingwei Zhang)

- Add Intel cstate driver to support for Wildcat Lake (WCL) CPUs,
which are a low-power variant of Panther Lake (Zide Chen)

- Add core, cstate and MSR PMU support for the Airmont NP Intel CPU
(aka MaxLinear Lightning Mountain), which maps to the existing
Airmont code (Martin Schiller)

Performance enhancements:

- Speed up kexec shutdown by avoiding unnecessary cross CPU calls
(Jan H. Schönherr)

- Fix slow perf_event_task_exit() with LBR callstacks (Namhyung Kim)

User-space stack unwinding support:

- Various cleanups and refactorings in preparation to generalize the
unwinding code for other architectures (Jens Remus)

Uprobes updates:

- Transition from kmap_atomic to kmap_local_page (Keke Ming)

- Fix incorrect lockdep condition in filter_chain() (Breno Leitao)

- Fix XOL allocation failure for 32-bit tasks (Oleg Nesterov)

Misc fixes and cleanups:

- s390: Remove kvm_types.h from Kbuild (Randy Dunlap)

- x86/intel/uncore: Convert comma to semicolon (Chen Ni)

- x86/uncore: Clean up const mismatch (Greg Kroah-Hartman)

- x86/ibs: Fix typo in dc_l2tlb_miss comment (Xiang-Bin Shi)"

* tag 'perf-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (58 commits)
s390: remove kvm_types.h from Kbuild
uprobes: Fix incorrect lockdep condition in filter_chain()
x86/ibs: Fix typo in dc_l2tlb_miss comment
x86/uprobes: Fix XOL allocation failure for 32-bit tasks
perf/x86/intel/uncore: Convert comma to semicolon
perf/x86/intel: Add support for rdpmc user disable feature
perf/x86: Use macros to replace magic numbers in attr_rdpmc
perf/x86/intel: Add core PMU support for Novalake
perf/x86/intel: Add support for PEBS memory auxiliary info field in NVL
perf/x86/intel: Add core PMU support for DMR
perf/x86/intel: Add support for PEBS memory auxiliary info field in DMR
perf/x86/intel: Support the 4 new OMR MSRs introduced in DMR and NVL
perf/core: Fix slow perf_event_task_exit() with LBR callstacks
perf/core: Speed up kexec shutdown by avoiding unnecessary cross CPU calls
uprobes: use kmap_local_page() for temporary page mappings
arm/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol()
mips/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol()
arm64/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol()
riscv/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol()
perf/x86/intel/uncore: Add Nova Lake support
...

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Merge tag 'bpf-next-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Pull bpf updates from Alexei Starovoitov:

- Support associating BPF program with struct_ops (Amery Hung)

-

Merge tag 'bpf-next-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Pull bpf updates from Alexei Starovoitov:

- Support associating BPF program with struct_ops (Amery Hung)

- Switch BPF local storage to rqspinlock and remove recursion detection
counters which were causing false positives (Amery Hung)

- Fix live registers marking for indirect jumps (Anton Protopopov)

- Introduce execution context detection BPF helpers (Changwoo Min)

- Improve verifier precision for 32bit sign extension pattern
(Cupertino Miranda)

- Optimize BTF type lookup by sorting vmlinux BTF and doing binary
search (Donglin Peng)

- Allow states pruning for misc/invalid slots in iterator loops (Eduard
Zingerman)

- In preparation for ASAN support in BPF arenas teach libbpf to move
global BPF variables to the end of the region and enable arena kfuncs
while holding locks (Emil Tsalapatis)

- Introduce support for implicit arguments in kfuncs and migrate a
number of them to new API. This is a prerequisite for cgroup
sub-schedulers in sched-ext (Ihor Solodrai)

- Fix incorrect copied_seq calculation in sockmap (Jiayuan Chen)

- Fix ORC stack unwind from kprobe_multi (Jiri Olsa)

- Speed up fentry attach by using single ftrace direct ops in BPF
trampolines (Jiri Olsa)

- Require frozen map for calculating map hash (KP Singh)

- Fix lock entry creation in TAS fallback in rqspinlock (Kumar
Kartikeya Dwivedi)

- Allow user space to select cpu in lookup/update operations on per-cpu
array and hash maps (Leon Hwang)

- Make kfuncs return trusted pointers by default (Matt Bobrowski)

- Introduce "fsession" support where single BPF program is executed
upon entry and exit from traced kernel function (Menglong Dong)

- Allow bpf_timer and bpf_wq use in all programs types (Mykyta
Yatsenko, Andrii Nakryiko, Kumar Kartikeya Dwivedi, Alexei
Starovoitov)

- Make KF_TRUSTED_ARGS the default for all kfuncs and clean up their
definition across the tree (Puranjay Mohan)

- Allow BPF arena calls from non-sleepable context (Puranjay Mohan)

- Improve register id comparison logic in the verifier and extend
linked registers with negative offsets (Puranjay Mohan)

- In preparation for BPF-OOM introduce kfuncs to access memcg events
(Roman Gushchin)

- Use CFI compatible destructor kfunc type (Sami Tolvanen)

- Add bitwise tracking for BPF_END in the verifier (Tianci Cao)

- Add range tracking for BPF_DIV and BPF_MOD in the verifier (Yazhou
Tang)

- Make BPF selftests work with 64k page size (Yonghong Song)

* tag 'bpf-next-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (268 commits)
selftests/bpf: Fix outdated test on storage->smap
selftests/bpf: Choose another percpu variable in bpf for btf_dump test
selftests/bpf: Remove test_task_storage_map_stress_lookup
selftests/bpf: Update task_local_storage/task_storage_nodeadlock test
selftests/bpf: Update task_local_storage/recursion test
selftests/bpf: Update sk_storage_omem_uncharge test
bpf: Switch to bpf_selem_unlink_nofail in bpf_local_storage_{map_free, destroy}
bpf: Support lockless unlink when freeing map or local storage
bpf: Prepare for bpf_selem_unlink_nofail()
bpf: Remove unused percpu counter from bpf_local_storage_map_free
bpf: Remove cgroup local storage percpu counter
bpf: Remove task local storage percpu counter
bpf: Change local_storage->lock and b->lock to rqspinlock
bpf: Convert bpf_selem_unlink to failable
bpf: Convert bpf_selem_link_map to failable
bpf: Convert bpf_selem_unlink_map to failable
bpf: Select bpf_local_storage_map_bucket based on bpf_local_storage
selftests/xsk: fix number of Tx frags in invalid packet
selftests/xsk: properly handle batch ending in the middle of a packet
bpf: Prevent reentrance into call_rcu_tasks_trace()
...

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Merge tag 'hardening-v7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening updates from Kees Cook:
"Mostly small cleanups and various scattered annotations and flex a

Merge tag 'hardening-v7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening updates from Kees Cook:
"Mostly small cleanups and various scattered annotations and flex array
warning fixes that we reviewed by unlanded in other trees. Introduces
new annotation for expanding counted_by to pointer members, now that
compiler behavior between GCC and Clang has been normalized.

- Various missed __counted_by annotations (Thorsten Blum)

- Various missed -Wflex-array-member-not-at-end fixes (Gustavo A. R.
Silva)

- Avoid leftover tempfiles for interrupted compile-time FORTIFY tests
(Nicolas Schier)

- Remove non-existant CONFIG_UBSAN_REPORT_FULL from docs (Stefan
Wiehler)

- fortify: Use C arithmetic not FIELD_xxx() in FORTIFY_REASON defines
(David Laight)

- Add __counted_by_ptr attribute, tests, and first user (Bill
Wendling, Kees Cook)

- Update MAINTAINERS file to make hardening section not include
pstore"

* tag 'hardening-v7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
MAINTAINERS: pstore: Remove L: entry
nfp: tls: Avoid -Wflex-array-member-not-at-end warnings
carl9170: Avoid -Wflex-array-member-not-at-end warning
coredump: Use __counted_by_ptr for struct core_name::corename
lkdtm/bugs: Add __counted_by_ptr() test PTR_BOUNDS
compiler_types.h: Attributes: Add __counted_by_ptr macro
fortify: Cleanup temp file also on non-successful exit
fortify: Rename temporary file to match ignore pattern
fortify: Use C arithmetic not FIELD_xxx() in FORTIFY_REASON defines
ecryptfs: Annotate struct ecryptfs_message with __counted_by
fs/xattr: Annotate struct simple_xattr with __counted_by
crypto: af_alg - Annotate struct af_alg_iv with __counted_by
Kconfig.ubsan: Remove CONFIG_UBSAN_REPORT_FULL from documentation
drm/nouveau: fifo: Avoid -Wflex-array-member-not-at-end warning

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Merge tag 'kthread-for-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks

Pull kthread updates from Frederic Weisbecker:
"The kthread code provides an infrastructure whic

Merge tag 'kthread-for-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks

Pull kthread updates from Frederic Weisbecker:
"The kthread code provides an infrastructure which manages the
preferred affinity of unbound kthreads (node or custom cpumask)
against housekeeping (CPU isolation) constraints and CPU hotplug
events.

One crucial missing piece is the handling of cpuset: when an isolated
partition is created, deleted, or its CPUs updated, all the unbound
kthreads in the top cpuset become indifferently affine to _all_ the
non-isolated CPUs, possibly breaking their preferred affinity along
the way.

Solve this with performing the kthreads affinity update from cpuset to
the kthreads consolidated relevant code instead so that preferred
affinities are honoured and applied against the updated cpuset
isolated partitions.

The dispatch of the new isolated cpumasks to timers, workqueues and
kthreads is performed by housekeeping, as per the nice Tejun's
suggestion.

As a welcome side effect, HK_TYPE_DOMAIN then integrates both the set
from boot defined domain isolation (through isolcpus=) and cpuset
isolated partitions. Housekeeping cpumasks are now modifiable with a
specific RCU based synchronization. A big step toward making
nohz_full= also mutable through cpuset in the future"

* tag 'kthread-for-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks: (33 commits)
doc: Add housekeeping documentation
kthread: Document kthread_affine_preferred()
kthread: Comment on the purpose and placement of kthread_affine_node() call
kthread: Honour kthreads preferred affinity after cpuset changes
sched/arm64: Move fallback task cpumask to HK_TYPE_DOMAIN
sched: Switch the fallback task allowed cpumask to HK_TYPE_DOMAIN
kthread: Rely on HK_TYPE_DOMAIN for preferred affinity management
kthread: Include kthreadd to the managed affinity list
kthread: Include unbound kthreads in the managed affinity list
kthread: Refine naming of affinity related fields
PCI: Remove superfluous HK_TYPE_WQ check
sched/isolation: Remove HK_TYPE_TICK test from cpu_is_isolated()
cpuset: Remove cpuset_cpu_is_isolated()
timers/migration: Remove superfluous cpuset isolation test
cpuset: Propagate cpuset isolation update to timers through housekeeping
cpuset: Propagate cpuset isolation update to workqueue through housekeeping
PCI: Flush PCI probe workqueue on cpuset isolated partition change
sched/isolation: Flush vmstat workqueues on cpuset isolated partition change
sched/isolation: Flush memcg workqueues on cpuset isolated partition change
cpuset: Update HK_TYPE_DOMAIN cpumask from cpuset
...

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Merge tag 'vfs-7.0-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull misc vfs updates from Christian Brauner:
"This contains a mix of VFS cleanups, performance improvements, A

Merge tag 'vfs-7.0-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull misc vfs updates from Christian Brauner:
"This contains a mix of VFS cleanups, performance improvements, API
fixes, documentation, and a deprecation notice.

Scalability and performance:

- Rework pid allocation to only take pidmap_lock once instead of
twice during alloc_pid(), improving thread creation/teardown
throughput by 10-16% depending on false-sharing luck. Pad the
namespace refcount to reduce false-sharing

- Track file lock presence via a flag in ->i_opflags instead of
reading ->i_flctx, avoiding false-sharing with ->i_readcount on
open/close hot paths. Measured 4-16% improvement on 24-core
open-in-a-loop benchmarks

- Use a consume fence in locks_inode_context() to match the
store-release/load-consume idiom, eliminating a hardware fence on
some architectures

- Annotate cdev_lock with __cacheline_aligned_in_smp to prevent
false-sharing

- Remove a redundant DCACHE_MANAGED_DENTRY check in
__follow_mount_rcu() that never fires since the caller already
verifies it, eliminating a 100% mispredicted branch

- Fix a 100% mispredicted likely() in devcgroup_inode_permission()
that became wrong after a prior code reorder

Bug fixes and correctness:

- Make insert_inode_locked() wait for inode destruction instead of
skipping, fixing a corner case where two matching inodes could
exist in the hash

- Move f_mode initialization before file_ref_init() in alloc_file()
to respect the SLAB_TYPESAFE_BY_RCU ordering contract

- Add a WARN_ON_ONCE guard in try_to_free_buffers() for folios with
no buffers attached, preventing a null pointer dereference when
AS_RELEASE_ALWAYS is set but no release_folio op exists

- Fix select restart_block to store end_time as timespec64, avoiding
truncation of tv_sec on 32-bit architectures

- Make dump_inode() use get_kernel_nofault() to safely access inode
and superblock fields, matching the dump_mapping() pattern

API modernization:

- Make posix_acl_to_xattr() allocate the buffer internally since
every single caller was doing it anyway. Reduces boilerplate and
unnecessary error checking across ~15 filesystems

- Replace deprecated simple_strtoul() with kstrtoul() for the
ihash_entries, dhash_entries, mhash_entries, and mphash_entries
boot parameters, adding proper error handling

- Convert chardev code to use guard(mutex) and __free(kfree) cleanup
patterns

- Replace min_t() with min() or umin() in VFS code to avoid silently
truncating unsigned long to unsigned int

- Gate LOOKUP_RCU assertions behind CONFIG_DEBUG_VFS since callers
already check the flag

Deprecation:

- Begin deprecating legacy BSD process accounting (acct(2)). The
interface has numerous footguns and better alternatives exist
(eBPF)

Documentation:

- Fix and complete kernel-doc for struct export_operations, removing
duplicated documentation between ReST and source

- Fix kernel-doc warnings for __start_dirop() and ilookup5_nowait()

Testing:

- Add a kunit test for initramfs cpio handling of entries with
filesize > PATH_MAX

Misc:

- Add missing <linux/init_task.h> include in fs_struct.c"

* tag 'vfs-7.0-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (28 commits)
posix_acl: make posix_acl_to_xattr() alloc the buffer
fs: make insert_inode_locked() wait for inode destruction
initramfs_test: kunit test for cpio.filesize > PATH_MAX
fs: improve dump_inode() to safely access inode fields
fs: add <linux/init_task.h> for 'init_fs'
docs: exportfs: Use source code struct documentation
fs: move initializing f_mode before file_ref_init()
exportfs: Complete kernel-doc for struct export_operations
exportfs: Mark struct export_operations functions at kernel-doc
exportfs: Fix kernel-doc output for get_name()
acct(2): begin the deprecation of legacy BSD process accounting
device_cgroup: remove branch hint after code refactor
VFS: fix __start_dirop() kernel-doc warnings
fs: Describe @isnew parameter in ilookup5_nowait()
fs/namei: Remove redundant DCACHE_MANAGED_DENTRY check in __follow_mount_rcu
fs: only assert on LOOKUP_RCU when built with CONFIG_DEBUG_VFS
select: store end_time as timespec64 in restart block
chardev: Switch to guard(mutex) and __free(kfree)
namespace: Replace simple_strtoul with kstrtoul to parse boot params
dcache: Replace simple_strtoul with kstrtoul in set_dhash_entries
...

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Merge branch 'for-6.20/sony' into for-linus

- Support for Rock band 4 PS4 and PS5 guitars (Rosalie Wanders)

cpuset: Propagate cpuset isolation update to workqueue through housekeeping

Until now, cpuset would propagate isolated partition changes to
workqueues so that unbound workers get properly reaffined.

cpuset: Propagate cpuset isolation update to workqueue through housekeeping

Until now, cpuset would propagate isolated partition changes to
workqueues so that unbound workers get properly reaffined.

Since housekeeping now centralizes, synchronize and propagates isolation
cpumask changes, perform the work from that subsystem for consolidation
and consistency purposes.

For simplification purpose, the target function is adapted to take the
new housekeeping mask instead of the isolated mask.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Waiman Long <longman@redhat.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: "Michal Koutný" <mkoutny@suse.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Marco Crivellari <marco.crivellari@suse.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Waiman Long <longman@redhat.com>
Cc: cgroups@vger.kernel.org

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rseq: Add fields and constants for time slice extension

Aside of a Kconfig knob add the following items:

- Two flag bits for the rseq user space ABI, which allow user space to
query the ava

rseq: Add fields and constants for time slice extension

Aside of a Kconfig knob add the following items:

- Two flag bits for the rseq user space ABI, which allow user space to
query the availability and enablement without a syscall.

- A new member to the user space ABI struct rseq, which is going to be
used to communicate request and grant between kernel and user space.

- A rseq state struct to hold the kernel state of this

- Documentation of the new mechanism

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20251215155708.669472597@linutronix.de

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Merge tag 'v6.19-rc1' into msm-next

Merge Linux 6.19-rc1 in order to catch up with other changes (e.g. UBWC
config database defining UBWC_6).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.q

Merge tag 'v6.19-rc1' into msm-next

Merge Linux 6.19-rc1 in order to catch up with other changes (e.g. UBWC
config database defining UBWC_6).

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

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compiler_types.h: Attributes: Add __counted_by_ptr macro

Introduce __counted_by_ptr(), which works like __counted_by(), but for
pointer struct members.

struct foo {
int a, b, c;
char *buffer __co

compiler_types.h: Attributes: Add __counted_by_ptr macro

Introduce __counted_by_ptr(), which works like __counted_by(), but for
pointer struct members.

struct foo {
int a, b, c;
char *buffer __counted_by_ptr(bytes);
short nr_bars;
struct bar *bars __counted_by_ptr(nr_bars);
size_t bytes;
};

Because "counted_by" can only be applied to pointer members in very
recent compiler versions, its application ends up needing to be distinct
from flexibe array "counted_by" annotations, hence a separate macro.

This is a reworking of Kees' previous patch [1].

Link: https://lore.kernel.org/all/20251020220118.1226740-1-kees@kernel.org/ [1]
Co-developed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Bill Wendling <morbo@google.com>
Link: https://patch.msgid.link/20260116005838.2419118-1-morbo@google.com
Signed-off-by: Kees Cook <kees@kernel.org>

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Merge UAPI header testing improvements into kbuild-next

Signed-off-by: Nathan Chancellor <nathan@kernel.org>

kbuild: uapi: drop dependency on CC_CAN_LINK

The header tests try to compile each header. Some UAPI headers depend on
libc headers so they need a full userspace toolchain to build. This
dependency i

kbuild: uapi: drop dependency on CC_CAN_LINK

The header tests try to compile each header. Some UAPI headers depend on
libc headers so they need a full userspace toolchain to build. This
dependency is expressed in kconfig as a dependency on CC_CAN_LINK.
Many kernel builds do not satisfy CC_CAN_LINK as they only use a
minimal kernel (cross-) compiler. In those configurations the UAPI
headers are not tested at all.

However most UAPI headers do not even depend on any libc headers,
and such dependencies are undesired in any case. Also the static
analysis performed by headers_check.pl does not need CC_CAN_LINK.

Drop the hard dependency on CC_CAN_LINK and instead skip the affected
compilation step for exactly those headers which require libc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://patch.msgid.link/20251223-uapi-nostdinc-v1-5-d91545d794f7@linutronix.de
Signed-off-by: Nathan Chancellor <nathan@kernel.org>

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acct(2): begin the deprecation of legacy BSD process accounting

As Christian points out [1], even though it's privileged, this interface
has a lot of footguns. There are better options these days (e

acct(2): begin the deprecation of legacy BSD process accounting

As Christian points out [1], even though it's privileged, this interface
has a lot of footguns. There are better options these days (e.g. eBPF),
so it would be good to start discouraging its use and mark it as
deprecated.

[1]: https://lore.kernel.org/linux-fsdevel/20250212-giert-spannend-8893f1eaba7d@brauner/

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260106-bsd-acct-v1-1-d15564b52c83@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

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Merge branch 'resolve_btfids-support-for-btf-modifications'

Ihor Solodrai says:

====================
resolve_btfids: Support for BTF modifications

This series changes resolve_btfids and kernel bui

Merge branch 'resolve_btfids-support-for-btf-modifications'

Ihor Solodrai says:

====================
resolve_btfids: Support for BTF modifications

This series changes resolve_btfids and kernel build scripts to enable
BTF transformations in resolve_btfids. Main motivation for enhancing
resolve_btfids is to reduce dependency of the kernel build on pahole
capabilities [1] and enable BTF features and optimizations [2][3]
particular to the kernel.

Patches #1-#4 in the series are non-functional changes in
resolve_btfids.

Patch #5 makes kernel build notice pahole version changes between
builds.

Patch #6 changes minimum version of pahole required for
CONFIG_DEBUG_INFO_BTF to v1.22

Patch #7 makes a small prep change in selftests/bpf build.

The last patch (#8) makes significant changes in resolve_btfids and
introduces scripts/gen-btf.sh. See implementation details in the patch
description.

Successful BPF CI run: https://github.com/kernel-patches/bpf/actions/runs/20378061470

[1] https://lore.kernel.org/dwarves/ba1650aa-fafd-49a8-bea4-bdddee7c38c9@linux.dev/
[2] https://lore.kernel.org/bpf/20251029190113.3323406-1-ihor.solodrai@linux.dev/
[3] https://lore.kernel.org/bpf/20251119031531.1817099-1-dolinux.peng@gmail.com/
---

v6->v7:
- documentation edits in patches #5 and #6 (Nicolas)

v6: https://lore.kernel.org/bpf/20251219020006.785065-1-ihor.solodrai@linux.dev/

v5->v6:
- patch #8: fix double free when btf__distill_base fails (reported by AI)
https://lore.kernel.org/bpf/e269870b8db409800045ee0061fc02d21721e0efadd99ca83960b48f8db7b3f3@mail.kernel.org/

v5: https://lore.kernel.org/bpf/20251219003147.587098-1-ihor.solodrai@linux.dev/

v4->v5:
- patch #3: fix an off-by-one bug (reported by AI)
https://lore.kernel.org/bpf/106b6e71bce75b8f12a85f2f99e75129e67af7287f6d81fa912589ece14044f9@mail.kernel.org/
- patch #8: cleanup GEN_BTF in Makefile.btf

v4: https://lore.kernel.org/bpf/20251218003314.260269-1-ihor.solodrai@linux.dev/

v3->v4:
- add patch #4: "resolve_btfids: Always build with -Wall -Werror"
- add patch #5: "kbuild: Sync kconfig when PAHOLE_VERSION changes" (Alan)
- fix clang cross-compilation (LKP)
https://lore.kernel.org/bpf/cecb6351-ea9a-4f8a-863a-82c9ef02f012@linux.dev/
- remove GEN_BTF env variable (Andrii)
- nits and cleanup in resolve_btfids/main.c (Andrii, Eduard)
- nits in a patch bumping minimum pahole version (Andrii, AI)

v3: https://lore.kernel.org/bpf/20251205223046.4155870-1-ihor.solodrai@linux.dev/

v2->v3:
- add patch #4 bumping minimum pahole version (Andrii, Alan)
- add patch #5 pre-fixing resolve_btfids test (Donglin)
- add GEN_BTF var and assemble RESOLVE_BTFIDS_FLAGS in Makefile.btf (Alan)
- implement --distill_base flag in resolve_btfids, set it depending
on KBUILD_EXTMOD in Makefile.btf (Eduard)
- various implementation nits, see the v2 thread for details (Andrii, Eduard)

v2: https://lore.kernel.org/bpf/20251127185242.3954132-1-ihor.solodrai@linux.dev/

v1->v2:
- gen-btf.sh and other shell script fixes (Donglin)
- update selftests build (Donglin)
- generate .BTF.base only when KBUILD_EXTMOD is set (Alan)
- proper endianness handling for cross-compilation
- change elf_begin mode from ELF_C_RDWR_MMAP to ELF_C_READ_MMAP_PRIVATE
- remove compressed_section_fix()
- nit NULL check in patch #3 (suggested by AI)

v1: https://lore.kernel.org/bpf/20251126012656.3546071-1-ihor.solodrai@linux.dev/
====================

Link: https://patch.msgid.link/20251219181321.1283664-1-ihor.solodrai@linux.dev
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

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kbuild: Sync kconfig when PAHOLE_VERSION changes

This patch implements kconfig re-sync when the pahole version changes
between builds, similar to how it happens for compiler version change
via CC_VE

kbuild: Sync kconfig when PAHOLE_VERSION changes

This patch implements kconfig re-sync when the pahole version changes
between builds, similar to how it happens for compiler version change
via CC_VERSION_TEXT.

Define PAHOLE_VERSION in the top-level Makefile and export it for
config builds. Set CONFIG_PAHOLE_VERSION default to the exported
variable.

Kconfig records the PAHOLE_VERSION value in
include/config/auto.conf.cmd [1].

The Makefile includes auto.conf.cmd, so if PAHOLE_VERSION changes
between builds, make detects a dependency change and triggers
syncconfig to update the kconfig [2].

For external module builds, add a warning message in the prepare
target, similar to the existing compiler version mismatch warning.

Note that if pahole is not installed or available, PAHOLE_VERSION is
set to 0 by pahole-version.sh, so the (un)installation of pahole is
treated as a version change.

See previous discussions for context [3].

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/scripts/kconfig/preprocess.c?h=v6.18#n91
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Makefile?h=v6.18#n815
[3] https://lore.kernel.org/bpf/8f946abf-dd88-4fac-8bb4-84fcd8d81cf0@oracle.com/

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Nicolas Schier <nsc@kernel.org>
Tested-by: Alan Maguire <alan.maguire@oracle.com>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Link: https://lore.kernel.org/bpf/20251219181321.1283664-6-ihor.solodrai@linux.dev

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Merge drm/drm-next into drm-xe-next

Backmerging to bring in 6.19-rc1. An important upstream bugfix and
to help unblock PTL CI.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>

perf: Add APIs to create/release mediated guest vPMUs

Currently, exposing PMU capabilities to a KVM guest is done by emulating
guest PMCs via host perf events, i.e. by having KVM be "just" another u

perf: Add APIs to create/release mediated guest vPMUs

Currently, exposing PMU capabilities to a KVM guest is done by emulating
guest PMCs via host perf events, i.e. by having KVM be "just" another user
of perf. As a result, the guest and host are effectively competing for
resources, and emulating guest accesses to vPMU resources requires
expensive actions (expensive relative to the native instruction). The
overhead and resource competition results in degraded guest performance
and ultimately very poor vPMU accuracy.

To address the issues with the perf-emulated vPMU, introduce a "mediated
vPMU", where the data plane (PMCs and enable/disable knobs) is exposed
directly to the guest, but the control plane (event selectors and access
to fixed counters) is managed by KVM (via MSR interceptions). To allow
host perf usage of the PMU to (partially) co-exist with KVM/guest usage
of the PMU, KVM and perf will coordinate to a world switch between host
perf context and guest vPMU context near VM-Enter/VM-Exit.

Add two exported APIs, perf_{create,release}_mediated_pmu(), to allow KVM
to create and release a mediated PMU instance (per VM). Because host perf
context will be deactivated while the guest is running, mediated PMU usage
will be mutually exclusive with perf analysis of the guest, i.e. perf
events that do NOT exclude the guest will not behave as expected.

To avoid silent failure of !exclude_guest perf events, disallow creating a
mediated PMU if there are active !exclude_guest events, and on the perf
side, disallowing creating new !exclude_guest perf events while there is
at least one active mediated PMU.

Exempt PMU resources that do not support mediated PMU usage, i.e. that are
outside the scope/view of KVM's vPMU and will not be swapped out while the
guest is running.

Guard mediated PMU with a new kconfig to help readers identify code paths
that are unique to mediated PMU support, and to allow for adding arch-
specific hooks without stubs. KVM x86 is expected to be the only KVM
architecture to support a mediated PMU in the near future (e.g. arm64 is
trending toward a partitioned PMU implementation), and KVM x86 will select
PERF_GUEST_MEDIATED_PMU unconditionally, i.e. won't need stubs.

Immediately select PERF_GUEST_MEDIATED_PMU when KVM x86 is enabled so that
all paths are compile tested. Full KVM support is on its way...

[sean: add kconfig and WARNing, rewrite changelog, swizzle patch ordering]
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Xudong Hao <xudong.hao@intel.com>
Link: https://patch.msgid.link/20251206001720.468579-5-seanjc@google.com

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Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf after 6.19-rc1

Cross-merge BPF and other fixes after downstream PR.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Merge drm/drm-next into drm-intel-next

Sync-up some display code needed for Async flips refactor.

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

Merge drm/drm-next into drm-misc-next

Let's kickstart the v6.20 (7.0?) release cycle.

Signed-off-by: Maxime Ripard <mripard@kernel.org>

Merge tag 'v6.18' into next

Sync up with the mainline to bring in the latest APIs.