Revert "PM / hibernate: avoid unsafe pages in e820 reserved regions"

Commit 84c91b7ae07c (PM / hibernate: avoid unsafe pages in e820 reserved
regions) is reported to make resume from hibernation on Lenovo x230
unreliable, so revert it.

We will revisit the issue the commit in question was supposed to fix
in the future.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=96111
Reported-by: rhn <kebuac.rhn@porcupinefactory.org>
Cc: 3.17+ <stable@vger.kernel.org> # 3.17+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index c24d5a23bf939be71f75736efdbd3874da157c2d..5235dd4e1e2f68a97fa6836d98854d2e8e46724e 100644 (file)
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -955,25 +955,6 @@ static void mark_nosave_pages(struct memory_bitmap *bm)
        }
 }
 
-static bool is_nosave_page(unsigned long pfn)
-{
-       struct nosave_region *region;
-
-       list_for_each_entry(region, &nosave_regions, list) {
-               if (pfn >= region->start_pfn && pfn < region->end_pfn) {
-                       pr_err("PM: %#010llx in e820 nosave region: "
-                              "[mem %#010llx-%#010llx]\n",
-                              (unsigned long long) pfn << PAGE_SHIFT,
-                              (unsigned long long) region->start_pfn << PAGE_SHIFT,
-                              ((unsigned long long) region->end_pfn << PAGE_SHIFT)
-                                       - 1);
-                       return true;
-               }
-       }
-
-       return false;
-}
-
 /**
  *     create_basic_memory_bitmaps - create bitmaps needed for marking page
  *     frames that should not be saved and free page frames.  The pointers
@@ -2042,7 +2023,7 @@ static int mark_unsafe_pages(struct memory_bitmap *bm)
        do {
                pfn = memory_bm_next_pfn(bm);
                if (likely(pfn != BM_END_OF_MAP)) {
-                       if (likely(pfn_valid(pfn)) && !is_nosave_page(pfn))
+                       if (likely(pfn_valid(pfn)))
                                swsusp_set_page_free(pfn_to_page(pfn));
                        else
                                return -EFAULT;