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x86/ioapic: Simplify ioapic_setup_resources()

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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>
This commit is contained in:
Rui Wang 2016-06-08 14:59:53 +08:00 committed by Ingo Molnar
parent 9d98bcec73
commit 4855531eb8
1 changed files with 7 additions and 11 deletions
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18
arch/x86/kernel/apic/io_apic.c
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@ -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;