Revert "swsusp special saveable pages support" commits
This reverts commits
3e3318dee0878d42ed62a19c292a2ac284135db3 [PATCH] swsusp: x86_64 mark special saveable/unsaveable pages
b6370d96e09944c6e3ae8d5743ca8a8ab1f79f6c [PATCH] swsusp: i386 mark special saveable/unsaveable pages
ce4ab0012b32c1a4a1d6e934aeb73bf3151c48d9 [PATCH] swsusp: add architecture special saveable pages support
because not only do they apparently cause page faults on x86, the
infrastructure doesn't compile on powerpc.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 3d92841..24c96f3 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -39,90 +39,8 @@
static unsigned int nr_meta_pages;
static unsigned long *buffer;
-struct arch_saveable_page {
- unsigned long start;
- unsigned long end;
- char *data;
- struct arch_saveable_page *next;
-};
-static struct arch_saveable_page *arch_pages;
-
-int swsusp_add_arch_pages(unsigned long start, unsigned long end)
-{
- struct arch_saveable_page *tmp;
-
- while (start < end) {
- tmp = kzalloc(sizeof(struct arch_saveable_page), GFP_KERNEL);
- if (!tmp)
- return -ENOMEM;
- tmp->start = start;
- tmp->end = ((start >> PAGE_SHIFT) + 1) << PAGE_SHIFT;
- if (tmp->end > end)
- tmp->end = end;
- tmp->next = arch_pages;
- start = tmp->end;
- arch_pages = tmp;
- }
- return 0;
-}
-
-static unsigned int count_arch_pages(void)
-{
- unsigned int count = 0;
- struct arch_saveable_page *tmp = arch_pages;
- while (tmp) {
- count++;
- tmp = tmp->next;
- }
- return count;
-}
-
-static int save_arch_mem(void)
-{
- char *kaddr;
- struct arch_saveable_page *tmp = arch_pages;
- int offset;
-
- pr_debug("swsusp: Saving arch specific memory");
- while (tmp) {
- tmp->data = (char *)__get_free_page(GFP_ATOMIC);
- if (!tmp->data)
- return -ENOMEM;
- offset = tmp->start - (tmp->start & PAGE_MASK);
- /* arch pages might haven't a 'struct page' */
- kaddr = kmap_atomic_pfn(tmp->start >> PAGE_SHIFT, KM_USER0);
- memcpy(tmp->data + offset, kaddr + offset,
- tmp->end - tmp->start);
- kunmap_atomic(kaddr, KM_USER0);
-
- tmp = tmp->next;
- }
- return 0;
-}
-
-static int restore_arch_mem(void)
-{
- char *kaddr;
- struct arch_saveable_page *tmp = arch_pages;
- int offset;
-
- while (tmp) {
- if (!tmp->data)
- continue;
- offset = tmp->start - (tmp->start & PAGE_MASK);
- kaddr = kmap_atomic_pfn(tmp->start >> PAGE_SHIFT, KM_USER0);
- memcpy(kaddr + offset, tmp->data + offset,
- tmp->end - tmp->start);
- kunmap_atomic(kaddr, KM_USER0);
- free_page((long)tmp->data);
- tmp->data = NULL;
- tmp = tmp->next;
- }
- return 0;
-}
-
#ifdef CONFIG_HIGHMEM
-static unsigned int count_highmem_pages(void)
+unsigned int count_highmem_pages(void)
{
struct zone *zone;
unsigned long zone_pfn;
@@ -199,7 +117,7 @@
return 0;
}
-static int save_highmem(void)
+int save_highmem(void)
{
struct zone *zone;
int res = 0;
@@ -216,7 +134,7 @@
return 0;
}
-static int restore_highmem(void)
+int restore_highmem(void)
{
printk("swsusp: Restoring Highmem\n");
while (highmem_copy) {
@@ -238,29 +156,6 @@
static inline int restore_highmem(void) {return 0;}
#endif
-unsigned int count_special_pages(void)
-{
- return count_arch_pages() + count_highmem_pages();
-}
-
-int save_special_mem(void)
-{
- int ret;
- ret = save_arch_mem();
- if (!ret)
- ret = save_highmem();
- return ret;
-}
-
-int restore_special_mem(void)
-{
- int ret;
- ret = restore_arch_mem();
- if (!ret)
- ret = restore_highmem();
- return ret;
-}
-
static int pfn_is_nosave(unsigned long pfn)
{
unsigned long nosave_begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
@@ -286,6 +181,7 @@
return 0;
page = pfn_to_page(pfn);
+ BUG_ON(PageReserved(page) && PageNosave(page));
if (PageNosave(page))
return 0;
if (PageReserved(page) && pfn_is_nosave(pfn))