swsusp: free more memory

Move the definition of PAGES_FOR_IO to kernel/power/power.h and introduce
SPARE_PAGES representing the number of pages that should be freed by the
swsusp's memory shrinker in addition to PAGES_FOR_IO so that device drivers
can allocate some memory (up to 1 MB total) in their .suspend() routines
without causing the suspend to fail.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@nigel.suspend2.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index 1109023d8358..5da304c8f1f6 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -233,7 +233,7 @@ int swsusp_shrink_memory(void)
                 long size, highmem_size;
 
                 highmem_size = count_highmem_pages();
-                size = count_data_pages() + PAGES_FOR_IO;
+                size = count_data_pages() + PAGES_FOR_IO + SPARE_PAGES;
                 tmp = size;
                 size += highmem_size;
                 for_each_zone (zone)