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>

3 files changed, 18 insertions, 116 deletions

diff --git a/kernel/power/power.h b/kernel/power/power.h
index 98c41423f3b1..57a792982fb9 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -105,10 +105,6 @@ extern struct bitmap_page *alloc_bitmap(unsigned int nr_bits);
 extern unsigned long alloc_swap_page(int swap, struct bitmap_page *bitmap);
 extern void free_all_swap_pages(int swap, struct bitmap_page *bitmap);
 
-extern unsigned int count_special_pages(void);
-extern int save_special_mem(void);
-extern int restore_special_mem(void);
-
 extern int swsusp_check(void);
 extern int swsusp_shrink_memory(void);
 extern void swsusp_free(void);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 3d9284100b22..24c96f354231 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -39,90 +39,8 @@ static unsigned int nr_copy_pages;
 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 @@ static int save_highmem_zone(struct zone *zone)
         return 0;
 }
 
-static int save_highmem(void)
+int save_highmem(void)
 {
         struct zone *zone;
         int res = 0;
@@ -216,7 +134,7 @@ static int save_highmem(void)
         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 save_highmem(void) {return 0;}
 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 @@ static int saveable(struct zone *zone, unsigned long *zone_pfn)
                 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))
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index f0ee4e7780d6..17f669c83012 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -62,6 +62,16 @@ unsigned long image_size = 500 * 1024 * 1024;
 
 int in_suspend __nosavedata = 0;
 
+#ifdef CONFIG_HIGHMEM
+unsigned int count_highmem_pages(void);
+int save_highmem(void);
+int restore_highmem(void);
+#else
+static inline int save_highmem(void) { return 0; }
+static inline int restore_highmem(void) { return 0; }
+static inline unsigned int count_highmem_pages(void) { return 0; }
+#endif
+
 /**
  *      The following functions are used for tracing the allocated
  *      swap pages, so that they can be freed in case of an error.
@@ -182,7 +192,7 @@ int swsusp_shrink_memory(void)
 
         printk("Shrinking memory...  ");
         do {
-                size = 2 * count_special_pages();
+                size = 2 * count_highmem_pages();
                 size += size / 50 + count_data_pages();
                 size += (size + PBES_PER_PAGE - 1) / PBES_PER_PAGE +
                         PAGES_FOR_IO;
@@ -226,7 +236,7 @@ int swsusp_suspend(void)
                 goto Enable_irqs;
         }
 
-        if ((error = save_special_mem())) {
+        if ((error = save_highmem())) {
                 printk(KERN_ERR "swsusp: Not enough free pages for highmem\n");
                 goto Restore_highmem;
         }
@@ -237,7 +247,7 @@ int swsusp_suspend(void)
         /* Restore control flow magically appears here */
         restore_processor_state();
 Restore_highmem:
-        restore_special_mem();
+        restore_highmem();
         device_power_up();
 Enable_irqs:
         local_irq_enable();
@@ -263,7 +273,7 @@ int swsusp_resume(void)
          */
         swsusp_free();
         restore_processor_state();
-        restore_special_mem();
+        restore_highmem();
         touch_softlockup_watchdog();
         device_power_up();
         local_irq_enable();