Update for the core interrupt subsystem:

- Invoke add_interrupt_randomness() in handle_percpu_devid_irq() and
      cleanup the workaround in the Hyper-V driver, which would now invoke
      it twice on ARM64. Removing it from the driver requires to add it to
      the x86 system vector entry point.
 
    - Remove the pointles cpu_read_lock() around reading CPU possible mask,
      which is read only after init.
 
    - Add documentation for the interaction between device tree bindings and
      the interrupt type defines in irq.h.
 
    - Delete stale defines in the matrix allocator and the equivalent in
      loongarch.
 -----BEGIN PGP SIGNATURE-----
 
 iQJEBAABCgAuFiEEQp8+kY+LLUocC4bMphj1TA10mKEFAmnbt64QHHRnbHhAa2Vy
 bmVsLm9yZwAKCRCmGPVMDXSYoY/xD/9hdmaaSXX/JySPatJPgkAhekR8cl/brK9t
 K6qhMltg/XoUhmU1y0XSfuNDJwEOa4qvW2DbwfnzknIDr0AXvL39S9oNn+1o9I0x
 BjIbWwHTAsuLVyjQesqPWwyQtZ8HJCIM+3Ju2rUYz4jYuY8q15GYsbh6QN0pYDNG
 F54/OpuNV42/UhX/O01Gxw930GMGnsMkV6ou9dquap23U4FdlIsoY+zU/b09VEU2
 MmJZPGwryPpzhSLbCdOGuWA9oM6wd/FoBFYYU31W5OSXm4B0cRs+weE31WMogYKM
 lqudBuyNAhCIuZ06sdSvBPRswdvkuTUJovrJwG2r+rV6h953ExujNn+/ZxqraPg7
 iPK70Kwp/O2uyMFhHp/6r1u4bylK/AL7q6hace4cZFLqB/Htx5BW+hh/H7Cz6Yan
 H3cyBz9XIE7K5BI3lotKnlWVFwkrHgwYXUzHHrMq/UPdQKog1IPh/E29JekqtR+p
 RS9QzSF+Gs45I7oMP+7P8o5jAZYuuW+cODnXLlQkuz/bJff3QeftFhOKZkzbFk5x
 AFT0DREttxVCGcUCQaQYrWhFshp63+eDXgKGQT1YULleFUC1f9KH2W+6KlqjDwFR
 rvrUgmpMxkH2JJz1owct6vJ6wyffFNQtPeCTmq+7GM87HNm6Ji6AaRzQjRnhVGCt
 mh9VbBTnFw==
 =FvJG
 -----END PGP SIGNATURE-----

Merge tag 'irq-core-2026-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull core irq updates from Thomas Gleixner:

 - Invoke add_interrupt_randomness() in handle_percpu_devid_irq() and
   cleanup the workaround in the Hyper-V driver, which would now invoke
   it twice on ARM64. Removing it from the driver requires to add it to
   the x86 system vector entry point

 - Remove the pointles cpu_read_lock() around reading CPU possible mask,
   which is read only after init

 - Add documentation for the interaction between device tree bindings
   and the interrupt type defines in irq.h

 - Delete stale defines in the matrix allocator and the equivalent in
   loongarch

* tag 'irq-core-2026-04-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Drivers: hv: Move add_interrupt_randomness() to hypervisor callback sysvec
  genirq/chip: Invoke add_interrupt_randomness() in handle_percpu_devid_irq()
  genirq/affinity: Remove cpus_read_lock() while reading cpu_possible_mask
  genirq/matrix, LoongArch: Delete IRQ_MATRIX_BITS leftovers
  genirq: Document interaction between <linux/irq.h> and DT binding defines

arch/loongarch/include/asm/irq.h

@@ -48,7 +48,6 @@ void spurious_interrupt(void);
  */
 #define NR_VECTORS		256
 #define NR_LEGACY_VECTORS	16
-#define IRQ_MATRIX_BITS		NR_VECTORS
 
 #define AVEC_IRQ_SHIFT		4
 #define AVEC_IRQ_BIT		8

arch/x86/kernel/cpu/mshyperv.c

@@ -161,6 +161,8 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_hyperv_callback)
 	if (vmbus_handler)
 		vmbus_handler();
 
+	add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR);
+
 	if (ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED)
 		apic_eoi();
 

drivers/hv/mshv_synic.c

@@ -12,7 +12,6 @@
 #include <linux/mm.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
-#include <linux/random.h>
 #include <linux/cpuhotplug.h>
 #include <linux/reboot.h>
 #include <asm/mshyperv.h>
@@ -445,8 +444,6 @@ void mshv_isr(void)
 		mb();
 		if (msg->header.message_flags.msg_pending)
 			hv_set_non_nested_msr(HV_MSR_EOM, 0);
-
-		add_interrupt_randomness(mshv_sint_vector);
 	} else {
 		pr_warn_once("%s: unknown message type 0x%x\n", __func__,
 			     msg->header.message_type);

drivers/hv/vmbus_drv.c

@@ -32,7 +32,6 @@
 #include <linux/ptrace.h>
 #include <linux/sysfb.h>
 #include <linux/efi.h>
-#include <linux/random.h>
 #include <linux/kernel.h>
 #include <linux/syscore_ops.h>
 #include <linux/dma-map-ops.h>
@@ -1361,8 +1360,6 @@ static void __vmbus_isr(void)
 
 	vmbus_message_sched(hv_cpu, hv_cpu->hyp_synic_message_page);
 	vmbus_message_sched(hv_cpu, hv_cpu->para_synic_message_page);
-
-	add_interrupt_randomness(vmbus_interrupt);
 }
 
 static DEFINE_PER_CPU(bool, vmbus_irq_pending);

include/linux/irq.h

@@ -35,6 +35,10 @@ enum irqchip_irq_state;
  *
  * Bits 0-7 are the same as the IRQF_* bits in linux/interrupt.h
  *
+ * Note that the first 6 definitions are shadowed by C preprocessor definitions
+ * in include/dt-bindings/interrupt-controller/irq.h.  This is not an issue, as
+ * the actual values must be the same, due to being part of the stable DT ABI.
+ *
  * IRQ_TYPE_NONE		- default, unspecified type
  * IRQ_TYPE_EDGE_RISING		- rising edge triggered
  * IRQ_TYPE_EDGE_FALLING	- falling edge triggered

kernel/irq/affinity.c

@@ -115,13 +115,10 @@ unsigned int irq_calc_affinity_vectors(unsigned int minvec, unsigned int maxvec,
 	if (resv > minvec)
 		return 0;
 
-	if (affd->calc_sets) {
+	if (affd->calc_sets)
 		set_vecs = maxvec - resv;
-	} else {
-		cpus_read_lock();
+	else
 		set_vecs = cpumask_weight(cpu_possible_mask);
-		cpus_read_unlock();
-	}
 
 	return resv + min(set_vecs, maxvec - resv);
 }

kernel/irq/chip.c

@@ -14,6 +14,7 @@
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
 #include <linux/irqdomain.h>
+#include <linux/random.h>
 
 #include <trace/events/irq.h>
 
@@ -929,6 +930,8 @@ void handle_percpu_devid_irq(struct irq_desc *desc)
 			    enabled ? " and unmasked" : "", irq, cpu);
 	}
 
+	add_interrupt_randomness(irq);
+
 	if (chip->irq_eoi)
 		chip->irq_eoi(&desc->irq_data);
 }

kernel/irq/matrix.c

@@ -39,7 +39,7 @@ struct irq_matrix {
 
 /**
  * irq_alloc_matrix - Allocate a irq_matrix structure and initialize it
- * @matrix_bits:	Number of matrix bits must be <= IRQ_MATRIX_BITS
+ * @matrix_bits:	Number of matrix bits
  * @alloc_start:	From which bit the allocation search starts
  * @alloc_end:		At which bit the allocation search ends, i.e first
  *			invalid bit