x86/ioapic: Remove obsolete post hotplug update

With single CPU affinities the post SMP boot vector update is pointless as
it will just leave the affinities on the same vectors and the same CPUs.

Remove it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Yu Chen <yu.c.chen@intel.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Rui Zhang <rui.zhang@intel.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Len Brown <lenb@kernel.org>
Link: https://lkml.kernel.org/r/20170913213154.308697243@linutronix.de

diff --git a/arch/x86/include/asm/io_apic.h b/arch/x86/include/asm/io_apic.h
index 6cbf2cfb3f8a02481d1c5c63b99eafb0c29eba35..731c686de37c0856585d5ada11938a82c5e20a6e 100644 (file)
--- a/arch/x86/include/asm/io_apic.h
+++ b/arch/x86/include/asm/io_apic.h
@@ -192,7 +192,6 @@ static inline unsigned int io_apic_read(unsigned int apic, unsigned int reg)
 extern void setup_IO_APIC(void);
 extern void enable_IO_APIC(void);
 extern void disable_IO_APIC(void);
-extern void setup_ioapic_dest(void);
 extern int IO_APIC_get_PCI_irq_vector(int bus, int devfn, int pin);
 extern void print_IO_APICs(void);
 #else  /* !CONFIG_X86_IO_APIC */
@@ -232,7 +231,6 @@ static inline void io_apic_init_mappings(void) { }
 
 static inline void setup_IO_APIC(void) { }
 static inline void enable_IO_APIC(void) { }
-static inline void setup_ioapic_dest(void) { }
 
 #endif
 

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index d8c75d61f76680bc5e801afcb573023281da883a..81f35ae3f884a671f2b07884613bdfb435ff1df4 100644 (file)
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2556,48 +2556,6 @@ int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
  * This function updates target affinity of IOAPIC interrupts to include
  * the CPUs which came online during SMP bringup.
  */
-#ifdef CONFIG_SMP
-void __init setup_ioapic_dest(void)
-{
-       int pin, ioapic, irq, irq_entry;
-       const struct cpumask *mask;
-       struct irq_desc *desc;
-       struct irq_data *idata;
-       struct irq_chip *chip;
-
-       if (skip_ioapic_setup == 1)
-               return;
-
-       for_each_ioapic_pin(ioapic, pin) {
-               irq_entry = find_irq_entry(ioapic, pin, mp_INT);
-               if (irq_entry == -1)
-                       continue;
-
-               irq = pin_2_irq(irq_entry, ioapic, pin, 0);
-               if (irq < 0 || !mp_init_irq_at_boot(ioapic, irq))
-                       continue;
-
-               desc = irq_to_desc(irq);
-               raw_spin_lock_irq(&desc->lock);
-               idata = irq_desc_get_irq_data(desc);
-
-               /*
-                * Honour affinities which have been set in early boot
-                */
-               if (!irqd_can_balance(idata) || irqd_affinity_was_set(idata))
-                       mask = irq_data_get_affinity_mask(idata);
-               else
-                       mask = irq_default_affinity;
-
-               chip = irq_data_get_irq_chip(idata);
-               /* Might be lapic_chip for irq 0 */
-               if (chip->irq_set_affinity)
-                       chip->irq_set_affinity(idata, mask, false);
-               raw_spin_unlock_irq(&desc->lock);
-       }
-}
-#endif
-
 #define IOAPIC_RESOURCE_NAME_SIZE 11
 
 static struct resource *ioapic_resources;

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 81652e3b8c17c9a98b2f31f7f12fba0a05f7f9da..d8cef32228872e6cdd143a969ad5c0a0cd57a3b0 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1360,7 +1360,6 @@ void __init native_smp_cpus_done(unsigned int max_cpus)
 
        nmi_selftest();
        impress_friends();
-       setup_ioapic_dest();
        mtrr_aps_init();
 }