x86: unify free_init_pages() and free_initmem()
[linux-2.6.git] / arch / x86 / mm / init.c
1 #include <linux/swap.h>
2 #include <asm/cacheflush.h>
3 #include <asm/page.h>
4 #include <asm/sections.h>
5 #include <asm/system.h>
6
7 void free_init_pages(char *what, unsigned long begin, unsigned long end)
8 {
9         unsigned long addr = begin;
10
11         if (addr >= end)
12                 return;
13
14         /*
15          * If debugging page accesses then do not free this memory but
16          * mark them not present - any buggy init-section access will
17          * create a kernel page fault:
18          */
19 #ifdef CONFIG_DEBUG_PAGEALLOC
20         printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
21                 begin, PAGE_ALIGN(end));
22         set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
23 #else
24         /*
25          * We just marked the kernel text read only above, now that
26          * we are going to free part of that, we need to make that
27          * writeable first.
28          */
29         set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
30
31         printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
32
33         for (; addr < end; addr += PAGE_SIZE) {
34                 ClearPageReserved(virt_to_page(addr));
35                 init_page_count(virt_to_page(addr));
36                 memset((void *)(addr & ~(PAGE_SIZE-1)),
37                         POISON_FREE_INITMEM, PAGE_SIZE);
38                 free_page(addr);
39                 totalram_pages++;
40         }
41 #endif
42 }
43
44 void free_initmem(void)
45 {
46         free_init_pages("unused kernel memory",
47                         (unsigned long)(&__init_begin),
48                         (unsigned long)(&__init_end));
49 }