Merge tag 'irq-core-2026-10-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull irq updates from Thomas Gleixner:
 "Updates for the generic interrupt subsystem:

   - Skip programming of MSI/MSI-X related data while a PCI channel is
     offline (Link is down) in the error recovery code path. Accessing
     an offline channel results in a BUS error which affects the
     underlying Root Port.

     Check for pci_channel_offline() and if true avoid the writes and
     just cache the modifications which are subsequently applied when
     the Link has recovered.

   - Prevent a stack UAF when a faulting interrupt thread exits. On X86
     the crash causes the stack to be discarded, which contains the
     callback head for the exit task_work to run the destructor. If the
     stack is clobbered before the destructor runs, then the indirect
     call of the task work function ends up in a random place. Move the
     callback head into the interrupt action to prevent that.

   - Prevent an UAF in the interrupt thread exit code which can happen
     when a faulting interrupt thread exits and races with a concurrent
     free_irq() by synchronizing free_irq() against thread exit.

   - Ensure that interrupt context accounting is accurate on interrupt
     return when checking for soft interrupt invocation.

     The code removed the hard interrupt context prematurely so that the
     subsequent code appeared to be in task context according to the
     preempt counter. That confuses ftrace, perf and K*SAN which get
     their recording context wrong. On Preempt-RT this can result in
     misbehaviour when BPF programs are attached to the affected region.

     Cure it by preserving the hard interrupt count up to the point
     where soft interrupts are actually invoked and switch directly to
     soft interrupt processing right there. That avoids the intermediate
     "in task context" state.

   - The usual small fixes and improvements"

* tag 'irq-core-2026-10-20' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq/proc: Fix missing CPU header in /proc/interrupts
  PCI/MSI: Skip MSI/MSI-X programming while the channel is offline
  genirq: Fix typos in comments
  genirq: Move interrupt thread exit_work object to irqaction
  genirq: Defer kfree(irqaction) until irq_thread_dtor() finishes
  softirq: Preserve interrupt context on return from interrupt
  softirq: Remove redundant h->action from preempt_count mismatch error
  genirq: Discard cpumask of irqaffinity= boot parameter if parsing fails

0 files changed, 0 insertions, 0 deletions