sparc32: add init memory poisoning

This patch adds init memory poisoning.  It looks like
totalram_pages was not updated properly in free_initrd_mem
so I fixed that as well.

Signed-off-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 3 deletions

diff --git a/arch/sparc/mm/init.c b/arch/sparc/mm/init.c
index e103f1bb3777..677c1e187a23 100644
--- a/arch/sparc/mm/init.c
+++ b/arch/sparc/mm/init.c
@@ -23,6 +23,7 @@
 #include <linux/highmem.h>
 #include <linux/bootmem.h>
 #include <linux/pagemap.h>
+#include <linux/poison.h>
 
 #include <asm/system.h>
 #include <asm/vac-ops.h>
@@ -480,6 +481,7 @@ void free_initmem (void)
         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
                 struct page *p;
 
+                memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
                 p = virt_to_page(addr);
 
                 ClearPageReserved(p);
@@ -488,20 +490,26 @@ void free_initmem (void)
                 totalram_pages++;
                 num_physpages++;
         }
-        printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
+        printk(KERN_INFO "Freeing unused kernel memory: %dk freed\n",
+                (&__init_end - &__init_begin) >> 10);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
 void free_initrd_mem(unsigned long start, unsigned long end)
 {
         if (start < end)
-                printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
+                printk(KERN_INFO "Freeing initrd memory: %ldk freed\n",
+                        (end - start) >> 10);
         for (; start < end; start += PAGE_SIZE) {
-                struct page *p = virt_to_page(start);
+                struct page *p;
+
+                memset((void *)start, POISON_FREE_INITMEM, PAGE_SIZE);
+                p = virt_to_page(start);
 
                 ClearPageReserved(p);
                 init_page_count(p);
                 __free_page(p);
+                totalram_pages++;
                 num_physpages++;
         }
 }