1 files changed, 65 insertions, 67 deletions

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index a92874a98b60..3ac807c1f4f3 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -985,26 +985,73 @@ static int __get_hwpoison_page(struct page *page)
 	return 0;
 }
 
-static int get_hwpoison_page(struct page *p)
+/*
+ * Safely get reference count of an arbitrary page.
+ *
+ * Returns 0 for a free page, 1 for an in-use page,
+ * -EIO for a page-type we cannot handle and -EBUSY if we raced with an
+ * allocation.
+ * We only incremented refcount in case the page was already in-use and it
+ * is a known type we can handle.
+ */
+static int get_any_page(struct page *p, unsigned long flags)
 {
-	int ret;
-	bool drained = false;
+	int ret = 0, pass = 0;
+	bool count_increased = false;
 
-retry:
-	ret = __get_hwpoison_page(p);
-	if (!ret && !is_free_buddy_page(p) && !page_count(p) && !drained) {
-		/*
-		 * The page might be in a pcplist, so try to drain those
-		 * and see if we are lucky.
-		 */
-		drain_all_pages(page_zone(p));
-		drained = true;
-		goto retry;
+	if (flags & MF_COUNT_INCREASED)
+		count_increased = true;
+
+try_again:
+	if (!count_increased && !__get_hwpoison_page(p)) {
+		if (page_count(p)) {
+			/* We raced with an allocation, retry. */
+			if (pass++ < 3)
+				goto try_again;
+			ret = -EBUSY;
+		} else if (!PageHuge(p) && !is_free_buddy_page(p)) {
+			/* We raced with put_page, retry. */
+			if (pass++ < 3)
+				goto try_again;
+			ret = -EIO;
+		}
+	} else {
+		if (PageHuge(p) || PageLRU(p) || __PageMovable(p)) {
+			ret = 1;
+		} else {
+			/*
+			 * A page we cannot handle. Check whether we can turn
+			 * it into something we can handle.
+			 */
+			if (pass++ < 3) {
+				put_page(p);
+				shake_page(p, 1);
+				count_increased = false;
+				goto try_again;
+			}
+			put_page(p);
+			ret = -EIO;
+		}
 	}
 
 	return ret;
 }
 
+static int get_hwpoison_page(struct page *p, unsigned long flags,
+			     enum mf_flags ctxt)
+{
+	int ret;
+
+	zone_pcp_disable(page_zone(p));
+	if (ctxt == MF_SOFT_OFFLINE)
+		ret = get_any_page(p, flags);
+	else
+		ret = __get_hwpoison_page(p);
+	zone_pcp_enable(page_zone(p));
+
+	return ret;
+}
+
 /*
  * Do all that is necessary to remove user space mappings. Unmap
  * the pages and send SIGBUS to the processes if the data was dirty.
@@ -1185,7 +1232,7 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
 
 	num_poisoned_pages_inc();
 
-	if (!(flags & MF_COUNT_INCREASED) && !get_hwpoison_page(p)) {
+	if (!(flags & MF_COUNT_INCREASED) && !get_hwpoison_page(p, flags, 0)) {
 		/*
 		 * Check "filter hit" and "race with other subpage."
 		 */
@@ -1387,7 +1434,7 @@ try_again:
 	 * In fact it's dangerous to directly bump up page count from 0,
 	 * that may make page_ref_freeze()/page_ref_unfreeze() mismatch.
 	 */
-	if (!(flags & MF_COUNT_INCREASED) && !get_hwpoison_page(p)) {
+	if (!(flags & MF_COUNT_INCREASED) && !get_hwpoison_page(p, flags, 0)) {
 		if (is_free_buddy_page(p)) {
 			if (take_page_off_buddy(p)) {
 				page_ref_inc(p);
@@ -1630,6 +1677,7 @@ int unpoison_memory(unsigned long pfn)
 	struct page *page;
 	struct page *p;
 	int freeit = 0;
+	unsigned long flags = 0;
 	static DEFINE_RATELIMIT_STATE(unpoison_rs, DEFAULT_RATELIMIT_INTERVAL,
 					DEFAULT_RATELIMIT_BURST);
 
@@ -1674,7 +1722,7 @@ int unpoison_memory(unsigned long pfn)
 		return 0;
 	}
 
-	if (!get_hwpoison_page(p)) {
+	if (!get_hwpoison_page(p, flags, 0)) {
 		if (TestClearPageHWPoison(p))
 			num_poisoned_pages_dec();
 		unpoison_pr_info("Unpoison: Software-unpoisoned free page %#lx\n",
@@ -1705,56 +1753,6 @@ int unpoison_memory(unsigned long pfn)
 }
 EXPORT_SYMBOL(unpoison_memory);
 
-/*
- * Safely get reference count of an arbitrary page.
- * Returns 0 for a free page, 1 for an in-use page, -EIO for a page-type we
- * cannot handle and -EBUSY if we raced with an allocation.
- * We only incremented refcount in case the page was already in-use and it is
- * a known type we can handle.
- */
-static int get_any_page(struct page *p, int flags)
-{
-	int ret = 0, pass = 0;
-	bool count_increased = false;
-
-	if (flags & MF_COUNT_INCREASED)
-		count_increased = true;
-
-try_again:
-	if (!count_increased && !get_hwpoison_page(p)) {
-		if (page_count(p)) {
-			/* We raced with an allocation, retry. */
-			if (pass++ < 3)
-				goto try_again;
-			ret = -EBUSY;
-		} else if (!PageHuge(p) && !is_free_buddy_page(p)) {
-			/* We raced with put_page, retry. */
-			if (pass++ < 3)
-				goto try_again;
-			ret = -EIO;
-		}
-	} else {
-		if (PageHuge(p) || PageLRU(p) || __PageMovable(p)) {
-			ret = 1;
-		} else {
-			/*
-			 * A page we cannot handle. Check whether we can turn
-			 * it into something we can handle.
-			 */
-			if (pass++ < 3) {
-				put_page(p);
-				shake_page(p, 1);
-				count_increased = false;
-				goto try_again;
-			}
-			put_page(p);
-			ret = -EIO;
-		}
-	}
-
-	return ret;
-}
-
 static bool isolate_page(struct page *page, struct list_head *pagelist)
 {
 	bool isolated = false;
@@ -1928,7 +1926,7 @@ int soft_offline_page(unsigned long pfn, int flags)
 
 retry:
 	get_online_mems();
-	ret = get_any_page(page, flags);
+	ret = get_hwpoison_page(page, flags, MF_SOFT_OFFLINE);
 	put_online_mems();
 
 	if (ret > 0) {