Commit 6c26fbe8c9d3 for kernel

commit 6c26fbe8c9d3e932dce6afe2505b19b4b261cae9
Merge: 63e6995005be 9929dffce5ed
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Mon Dec 1 20:42:01 2025 -0800

    Merge tag 'perf-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

    Pull performance events updates from Ingo Molnar:
     "Callchain support:

       - Add support for deferred user-space stack unwinding for perf,
         enabled on x86. (Peter Zijlstra, Steven Rostedt)

       - unwind_user/x86: Enable frame pointer unwinding on x86 (Josh
         Poimboeuf)

      x86 PMU support and infrastructure:

       - x86/insn: Simplify for_each_insn_prefix() (Peter Zijlstra)

       - x86/insn,uprobes,alternative: Unify insn_is_nop() (Peter Zijlstra)

      Intel PMU driver:

       - Large series to prepare for and implement architectural PEBS
         support for Intel platforms such as Clearwater Forest (CWF) and
         Panther Lake (PTL). (Dapeng Mi, Kan Liang)

       - Check dynamic constraints (Kan Liang)

       - Optimize PEBS extended config (Peter Zijlstra)

       - cstates:
          - Remove PC3 support from LunarLake (Zhang Rui)
          - Add Pantherlake support (Zhang Rui)
          - Clearwater Forest support (Zide Chen)

      AMD PMU driver:

       - x86/amd: Check event before enable to avoid GPF (George Kennedy)

      Fixes and cleanups:

       - task_work: Fix NMI race condition (Peter Zijlstra)

       - perf/x86: Fix NULL event access and potential PEBS record loss
         (Dapeng Mi)

       - Misc other fixes and cleanups (Dapeng Mi, Ingo Molnar, Peter
         Zijlstra)"

    * tag 'perf-core-2025-12-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (38 commits)
      perf/x86/intel: Fix and clean up intel_pmu_drain_arch_pebs() type use
      perf/x86/intel: Optimize PEBS extended config
      perf/x86/intel: Check PEBS dyn_constraints
      perf/x86/intel: Add a check for dynamic constraints
      perf/x86/intel: Add counter group support for arch-PEBS
      perf/x86/intel: Setup PEBS data configuration and enable legacy groups
      perf/x86/intel: Update dyn_constraint base on PEBS event precise level
      perf/x86/intel: Allocate arch-PEBS buffer and initialize PEBS_BASE MSR
      perf/x86/intel: Process arch-PEBS records or record fragments
      perf/x86/intel/ds: Factor out PEBS group processing code to functions
      perf/x86/intel/ds: Factor out PEBS record processing code to functions
      perf/x86/intel: Initialize architectural PEBS
      perf/x86/intel: Correct large PEBS flag check
      perf/x86/intel: Replace x86_pmu.drain_pebs calling with static call
      perf/x86: Fix NULL event access and potential PEBS record loss
      perf/x86: Remove redundant is_x86_event() prototype
      entry,unwind/deferred: Fix unwind_reset_info() placement
      unwind_user/x86: Fix arch=um build
      perf: Support deferred user unwind
      unwind_user/x86: Teach FP unwind about start of function
      ...