mm/s390: use common help functions to free reserved pages

Use common help functions to free reserved pages.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 29 deletions

diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 9f9c315b4c07..0b09b2342302 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -42,11 +42,10 @@ pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
 unsigned long empty_zero_page, zero_page_mask;
 EXPORT_SYMBOL(empty_zero_page);
 
-static unsigned long __init setup_zero_pages(void)
+static void __init setup_zero_pages(void)
 {
         struct cpuid cpu_id;
         unsigned int order;
-        unsigned long size;
         struct page *page;
         int i;
 
@@ -83,14 +82,11 @@ static unsigned long __init setup_zero_pages(void)
         page = virt_to_page((void *) empty_zero_page);
         split_page(page, order);
         for (i = 1 << order; i > 0; i--) {
-                SetPageReserved(page);
+                mark_page_reserved(page);
                 page++;
         }
 
-        size = PAGE_SIZE << order;
-        zero_page_mask = (size - 1) & PAGE_MASK;
-
-        return 1UL << order;
+        zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
 }
 
 /*
@@ -147,7 +143,7 @@ void __init mem_init(void)
 
         /* this will put all low memory onto the freelists */
         totalram_pages += free_all_bootmem();
-        totalram_pages -= setup_zero_pages();   /* Setup zeroed pages. */
+        setup_zero_pages();     /* Setup zeroed pages. */
 
         reservedpages = 0;
 
@@ -166,34 +162,15 @@ void __init mem_init(void)
                PFN_ALIGN((unsigned long)&_eshared) - 1);
 }
 
-void free_init_pages(char *what, unsigned long begin, unsigned long end)
-{
-        unsigned long addr = begin;
-
-        if (begin >= end)
-                return;
-        for (; addr < end; addr += PAGE_SIZE) {
-                ClearPageReserved(virt_to_page(addr));
-                init_page_count(virt_to_page(addr));
-                memset((void *)(addr & PAGE_MASK), POISON_FREE_INITMEM,
-                       PAGE_SIZE);
-                free_page(addr);
-                totalram_pages++;
-        }
-        printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
-}
-
 void free_initmem(void)
 {
-        free_init_pages("unused kernel memory",
-                        (unsigned long)&__init_begin,
-                        (unsigned long)&__init_end);
+        free_initmem_default(0);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
 void __init free_initrd_mem(unsigned long start, unsigned long end)
 {
-        free_init_pages("initrd memory", start, end);
+        free_reserved_area(start, end, POISON_FREE_INITMEM, "initrd");
 }
 #endif