x86/ioapic: Simplify ioapic_setup_resources()

Optimize the function by removing the variable 'num'.

Signed-off-by: Rui Wang <rui.y.wang@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: tony.luck@intel.com
Cc: linux-pci@vger.kernel.org
Cc: rjw@rjwysocki.net
Cc: linux-acpi@vger.kernel.org
Cc: bhelgaas@google.com
Link: http://lkml.kernel.org/r/1465369193-4816-4-git-send-email-rui.y.wang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 7 insertions, 11 deletions

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 446702ed99dc..e58729597a7a 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2567,29 +2567,25 @@ static struct resource * __init ioapic_setup_resources(void)
         unsigned long n;
         struct resource *res;
         char *mem;
-        int i, num = 0;
+        int i;
 
-        for_each_ioapic(i)
-                num++;
-        if (num == 0)
+        if (nr_ioapics == 0)
                 return NULL;
 
         n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
-        n *= num;
+        n *= nr_ioapics;
 
         mem = alloc_bootmem(n);
         res = (void *)mem;
 
-        mem += sizeof(struct resource) * num;
+        mem += sizeof(struct resource) * nr_ioapics;
 
-        num = 0;
         for_each_ioapic(i) {
-                res[num].name = mem;
-                res[num].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+                res[i].name = mem;
+                res[i].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
                 snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
                 mem += IOAPIC_RESOURCE_NAME_SIZE;
-                ioapics[i].iomem_res = &res[num];
-                num++;
+                ioapics[i].iomem_res = &res[i];
         }
 
         ioapic_resources = res;