1 #include <linux/swap.h>
2 #include <asm/cacheflush.h>
4 #include <asm/sections.h>
5 #include <asm/system.h>
7 void free_init_pages(char *what, unsigned long begin, unsigned long end)
9 unsigned long addr = begin;
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:
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);
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
29 set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
31 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
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);
44 void free_initmem(void)
46 free_init_pages("unused kernel memory",
47 (unsigned long)(&__init_begin),
48 (unsigned long)(&__init_end));