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Subject[tip:x86/apic] x86/ioapic: Simplify ioapic_setup_resources()
Commit-ID:  4855531eb8582a98cb905d2baf86021254d7a675
Gitweb: http://git.kernel.org/tip/4855531eb8582a98cb905d2baf86021254d7a675
Author: Rui Wang <rui.y.wang@intel.com>
AuthorDate: Wed, 8 Jun 2016 14:59:53 +0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 10 Jun 2016 14:48:18 +0200

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>
---
arch/x86/kernel/apic/io_apic.c | 18 +++++++-----------
1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 446702e..e587295 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;
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