memblock: Add memblock_mem_size()

Use it to get mem size under the limit_pfn.
to replace local version in x86 reserved_initrd.

-v2: remove not needed cast that is pointed out by HPA.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1359058816-7615-29-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 1 insertions, 15 deletions

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b80bee10982f..bbe8cdf7515e 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -363,20 +363,6 @@ static void __init relocate_initrd(void)
                 ramdisk_here, ramdisk_here + ramdisk_size - 1);
 }
 
-static u64 __init get_mem_size(unsigned long limit_pfn)
-{
-        int i;
-        u64 mapped_pages = 0;
-        unsigned long start_pfn, end_pfn;
-
-        for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
-                start_pfn = min_t(unsigned long, start_pfn, limit_pfn);
-                end_pfn = min_t(unsigned long, end_pfn, limit_pfn);
-                mapped_pages += end_pfn - start_pfn;
-        }
-
-        return mapped_pages << PAGE_SHIFT;
-}
 static void __init early_reserve_initrd(void)
 {
         /* Assume only end is not page aligned */
@@ -404,7 +390,7 @@ static void __init reserve_initrd(void)
 
         initrd_start = 0;
 
-        mapped_size = get_mem_size(max_pfn_mapped);
+        mapped_size = memblock_mem_size(max_pfn_mapped);
         if (ramdisk_size >= (mapped_size>>1))
                 panic("initrd too large to handle, "
                        "disabling initrd (%lld needed, %lld available)\n",