50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
|
#include <linux/swap.h>
|
||
|
|
#include <asm/cacheflush.h>
|
||
|
|
#include <asm/page.h>
|
||
|
|
#include <asm/sections.h>
|
||
|
|
#include <asm/system.h>
|
||
|
|
|
||
|
|
void free_init_pages(char *what, unsigned long begin, unsigned long end)
|
||
|
|
{
|
||
|
|
unsigned long addr = begin;
|
||
|
|
|
||
|
|
if (addr >= end)
|
||
|
|
return;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If debugging page accesses then do not free this memory but
|
||
|
|
* mark them not present - any buggy init-section access will
|
||
|
|
* create a kernel page fault:
|
||
|
|
*/
|
||
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
||
|
|
printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
|
||
|
|
begin, PAGE_ALIGN(end));
|
||
|
|
set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
|
||
|
|
#else
|
||
|
|
/*
|
||
|
|
* We just marked the kernel text read only above, now that
|
||
|
|
* we are going to free part of that, we need to make that
|
||
|
|
* writeable first.
|
||
|
|
*/
|
||
|
|
set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
|
||
|
|
|
||
|
|
printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
|
||
|
|
|
||
|
|
for (; addr < end; addr += PAGE_SIZE) {
|
||
|
|
ClearPageReserved(virt_to_page(addr));
|
||
|
|
init_page_count(virt_to_page(addr));
|
||
|
|
memset((void *)(addr & ~(PAGE_SIZE-1)),
|
||
|
|
POISON_FREE_INITMEM, PAGE_SIZE);
|
||
|
|
free_page(addr);
|
||
|
|
totalram_pages++;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
void free_initmem(void)
|
||
|
|
{
|
||
|
|
free_init_pages("unused kernel memory",
|
||
|
|
(unsigned long)(&__init_begin),
|
||
|
|
(unsigned long)(&__init_end));
|
||
|
|
}
|