x86: probe nr_irqs even only mptable is used

for !CONFIG_HAVE_SPARSE_IRQ

fix:

 In file included from arch/x86/kernel/early-quirks.c:18:
 include/asm/io_apic.h: In function 'probe_nr_irqs':
 include/asm/io_apic.h:209: error: 'NR_IRQS' undeclared (first use in this function)
 include/asm/io_apic.h:209: error: (Each undeclared identifier is reported only once
 include/asm/io_apic.h:209: error: for each function it appears in.)

v2: fix by Ingo

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 33 insertions, 41 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 3e9d163fd92f..5fef4fece4a5 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -957,29 +957,6 @@ void __init mp_register_ioapic(int id, u32 address, u32 gsi_base)
         nr_ioapics++;
 }
 
-int get_nr_irqs_via_madt(void)
-{
-        int idx;
-        int nr = 0;
-
-        for (idx = 0; idx < nr_ioapics; idx++) {
-                if (mp_ioapic_routing[idx].gsi_end > nr)
-                        nr = mp_ioapic_routing[idx].gsi_end;
-        }
-
-        nr++;
-
-        /* double it for hotplug and msi and nmi */
-        nr <<= 1;
-
-        /* something wrong ? */
-        if (nr < 32)
-                nr = 32;
-
-        return nr;
-
-}
-
 static void assign_to_mp_irq(struct mp_config_intsrc *m,
                                     struct mp_config_intsrc *mp_irq)
 {
@@ -1278,8 +1255,6 @@ static int __init acpi_parse_madt_ioapic_entries(void)
         }
 
 
-        nr_irqs = get_nr_irqs_via_madt();
-
         count =
             acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr,
                                   nr_irqs);
diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index f853b667fa5c..f7e80262cbbb 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -3596,6 +3596,36 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev)
 }
 #endif /* CONFIG_HT_IRQ */
 
+int __init io_apic_get_redir_entries (int ioapic)
+{
+        union IO_APIC_reg_01    reg_01;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ioapic_lock, flags);
+        reg_01.raw = io_apic_read(ioapic, 1);
+        spin_unlock_irqrestore(&ioapic_lock, flags);
+
+        return reg_01.bits.entries;
+}
+
+int __init probe_nr_irqs(void)
+{
+        int idx;
+        int nr = 0;
+
+        for (idx = 0; idx < nr_ioapics; idx++)
+                nr += io_apic_get_redir_entries(idx);
+
+        /* double it for hotplug and msi and nmi */
+        nr <<= 1;
+
+        /* something wrong ? */
+        if (nr < 32)
+                nr = 32;
+
+        return nr;
+}
+
 /* --------------------------------------------------------------------------
                           ACPI-based IOAPIC Configuration
    -------------------------------------------------------------------------- */
@@ -3690,19 +3720,6 @@ int __init io_apic_get_version(int ioapic)
 }
 #endif
 
-int __init io_apic_get_redir_entries (int ioapic)
-{
-        union IO_APIC_reg_01    reg_01;
-        unsigned long flags;
-
-        spin_lock_irqsave(&ioapic_lock, flags);
-        reg_01.raw = io_apic_read(ioapic, 1);
-        spin_unlock_irqrestore(&ioapic_lock, flags);
-
-        return reg_01.bits.entries;
-}
-
-
 int io_apic_set_pci_routing (int ioapic, int pin, int irq, int triggering, int polarity)
 {
         if (!IO_APIC_IRQ(irq)) {
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index d90c659b70e9..61335306696a 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1069,15 +1069,15 @@ void __init setup_arch(char **cmdline_p)
         prefill_possible_map();
 
 #ifdef CONFIG_X86_64
-        /* need to wait for nr_cpu_ids settle down */
-        if (nr_irqs == NR_IRQS)
-                nr_irqs = 32 * nr_cpu_ids + 224;
         init_cpu_to_node();
 #endif
 
         init_apic_mappings();
         ioapic_init_mappings();
 
+        /* need to wait for io_apic is mapped */
+        nr_irqs = probe_nr_irqs();
+
         kvm_guest_init();
 
         e820_reserve_resources();