Merge branch 'linux-5.7' of git://github.com/skeggsb/linux into drm-fixes

[linux-2.6-microblaze.git] / include / linux / page-flags.h

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 77de28b..222f6f7 100644 (file)
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -63,6 +63,11 @@
  * page_waitqueue(page) is a wait queue of all tasks waiting for the page
  * to become unlocked.
  *
+ * PG_swapbacked is set when a page uses swap as a backing storage.  This are
+ * usually PageAnon or shmem pages but please note that even anonymous pages
+ * might lose their PG_swapbacked flag when they simply can be dropped (e.g. as
+ * a result of MADV_FREE).
+ *
  * PG_uptodate tells whether the page's contents is valid.  When a read
  * completes, the page becomes uptodate, unless a disk I/O error happened.
  *
@@ -163,6 +168,9 @@ enum pageflags {
 
        /* non-lru isolated movable page */
        PG_isolated = PG_reclaim,
+
+       /* Only valid for buddy pages. Used to track pages that are reported */
+       PG_reported = PG_uptodate,
 };
 
 #ifndef __GENERATING_BOUNDS_H
@@ -431,6 +439,14 @@ TESTCLEARFLAG(Young, young, PF_ANY)
 PAGEFLAG(Idle, idle, PF_ANY)
 #endif
 
+/*
+ * PageReported() is used to track reported free pages within the Buddy
+ * allocator. We can use the non-atomic version of the test and set
+ * operations as both should be shielded with the zone lock to prevent
+ * any possible races on the setting or clearing of the bit.
+ */
+__PAGEFLAG(Reported, reported, PF_NO_COMPOUND)
+
 /*
  * On an anonymous page mapped into a user virtual memory area,
  * page->mapping points to its anon_vma, not to a struct address_space;