x86: allocate e820 resource struct all together

don't need to allocate that one by one

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

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index 4509757844eb..9184e6437c4f 100644
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -300,9 +300,10 @@ unsigned long __init e820_end_of_ram(void)
 void __init e820_reserve_resources(void)
 {
         int i;
+        struct resource *res;
+
+        res = alloc_bootmem_low(sizeof(struct resource) * e820.nr_map);
         for (i = 0; i < e820.nr_map; i++) {
-                struct resource *res;
-                res = alloc_bootmem_low(sizeof(struct resource));
                 switch (e820.map[i].type) {
                 case E820_RAM:  res->name = "System RAM"; break;
                 case E820_ACPI: res->name = "ACPI Tables"; break;
@@ -313,6 +314,7 @@ void __init e820_reserve_resources(void)
                 res->end = res->start + e820.map[i].size - 1;
                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
                 insert_resource(&iomem_resource, res);
+                res++;
         }
 }