PM: remove s390 specific callbacks

ARCH_SAVE_PAGE_KEYS has been introduced in order to be able to save
and restore s390 specific storage keys into a hibernation image.
With hibernation support removed from s390 there is no point in
keeping the callbacks.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 2b2055b..4fcc6fd 100644 (file)
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -566,38 +566,4 @@ static inline void queue_up_suspend_work(void) {}
 
 #endif /* !CONFIG_PM_AUTOSLEEP */
 
-#ifdef CONFIG_ARCH_SAVE_PAGE_KEYS
-/*
- * The ARCH_SAVE_PAGE_KEYS functions can be used by an architecture
- * to save/restore additional information to/from the array of page
- * frame numbers in the hibernation image. For s390 this is used to
- * save and restore the storage key for each page that is included
- * in the hibernation image.
- */
-unsigned long page_key_additional_pages(unsigned long pages);
-int page_key_alloc(unsigned long pages);
-void page_key_free(void);
-void page_key_read(unsigned long *pfn);
-void page_key_memorize(unsigned long *pfn);
-void page_key_write(void *address);
-
-#else /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
-
-static inline unsigned long page_key_additional_pages(unsigned long pages)
-{
-       return 0;
-}
-
-static inline int  page_key_alloc(unsigned long pages)
-{
-       return 0;
-}
-
-static inline void page_key_free(void) {}
-static inline void page_key_read(unsigned long *pfn) {}
-static inline void page_key_memorize(unsigned long *pfn) {}
-static inline void page_key_write(void *address) {}
-
-#endif /* !CONFIG_ARCH_SAVE_PAGE_KEYS */
-
 #endif /* _LINUX_SUSPEND_H */

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 7cbfbea..c208566 100644 (file)
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -80,9 +80,6 @@ config HIBERNATION
 
          For more information take a look at <file:Documentation/power/swsusp.rst>.
 
-config ARCH_SAVE_PAGE_KEYS
-       bool
-
 config PM_STD_PARTITION
        string "Default resume partition"
        depends on HIBERNATION

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index ddade80..e99d13b 100644 (file)
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1744,9 +1744,6 @@ int hibernate_preallocate_memory(void)
        count += highmem;
        count -= totalreserve_pages;
 
-       /* Add number of pages required for page keys (s390 only). */
-       size += page_key_additional_pages(saveable);
-
        /* Compute the maximum number of saveable pages to leave in memory. */
        max_size = (count - (size + PAGES_FOR_IO)) / 2
                        - 2 * DIV_ROUND_UP(reserved_size, PAGE_SIZE);
@@ -2075,8 +2072,6 @@ static inline void pack_pfns(unsigned long *buf, struct memory_bitmap *bm)
                buf[j] = memory_bm_next_pfn(bm);
                if (unlikely(buf[j] == BM_END_OF_MAP))
                        break;
-               /* Save page key for data page (s390 only). */
-               page_key_read(buf + j);
        }
 }
 
@@ -2226,9 +2221,6 @@ static int unpack_orig_pfns(unsigned long *buf, struct memory_bitmap *bm)
                if (unlikely(buf[j] == BM_END_OF_MAP))
                        break;
 
-               /* Extract and buffer page key for data page (s390 only). */
-               page_key_memorize(buf + j);
-
                if (pfn_valid(buf[j]) && memory_bm_pfn_present(bm, buf[j]))
                        memory_bm_set_bit(bm, buf[j]);
                else
@@ -2623,11 +2615,6 @@ int snapshot_write_next(struct snapshot_handle *handle)
                if (error)
                        return error;
 
-               /* Allocate buffer for page keys. */
-               error = page_key_alloc(nr_copy_pages);
-               if (error)
-                       return error;
-
                hibernate_restore_protection_begin();
        } else if (handle->cur <= nr_meta_pages + 1) {
                error = unpack_orig_pfns(buffer, &copy_bm);
@@ -2649,8 +2636,6 @@ int snapshot_write_next(struct snapshot_handle *handle)
                }
        } else {
                copy_last_highmem_page();
-               /* Restore page key for data page (s390 only). */
-               page_key_write(handle->buffer);
                hibernate_restore_protect_page(handle->buffer);
                handle->buffer = get_buffer(&orig_bm, &ca);
                if (IS_ERR(handle->buffer))
@@ -2673,9 +2658,6 @@ int snapshot_write_next(struct snapshot_handle *handle)
 void snapshot_write_finalize(struct snapshot_handle *handle)
 {
        copy_last_highmem_page();
-       /* Restore page key for data page (s390 only). */
-       page_key_write(handle->buffer);
-       page_key_free();
        hibernate_restore_protect_page(handle->buffer);
        /* Do that only if we have loaded the image entirely */
        if (handle->cur > 1 && handle->cur > nr_meta_pages + nr_copy_pages) {