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authorDan Williams <dan.j.williams@intel.com>2019-05-15 01:41:32 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-15 05:52:48 +0300
commitb03641af680959df57c275a80ff0dc116627c7ae (patch)
tree7420434fe3c82ebdd7b05cc59febe49e0e946366 /include/linux/mmzone.h
parente900a918b0984ec8f2eb150b8477a47b75d17692 (diff)
downloadlinux-b03641af680959df57c275a80ff0dc116627c7ae.tar.xz
mm: move buddy list manipulations into helpers
In preparation for runtime randomization of the zone lists, take all (well, most of) the list_*() functions in the buddy allocator and put them in helper functions. Provide a common control point for injecting additional behavior when freeing pages. [dan.j.williams@intel.com: fix buddy list helpers] Link: http://lkml.kernel.org/r/155033679702.1773410.13041474192173212653.stgit@dwillia2-desk3.amr.corp.intel.com [vbabka@suse.cz: remove del_page_from_free_area() migratetype parameter] Link: http://lkml.kernel.org/r/4672701b-6775-6efd-0797-b6242591419e@suse.cz Link: http://lkml.kernel.org/r/154899812264.3165233.5219320056406926223.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Tested-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Kees Cook <keescook@chromium.org> Cc: Keith Busch <keith.busch@intel.com> Cc: Robert Elliott <elliott@hpe.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r--include/linux/mmzone.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 1fb5a04530aa..acd6f9cb01bd 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -18,6 +18,8 @@
#include <linux/pageblock-flags.h>
#include <linux/page-flags-layout.h>
#include <linux/atomic.h>
+#include <linux/mm_types.h>
+#include <linux/page-flags.h>
#include <asm/page.h>
/* Free memory management - zoned buddy allocator. */
@@ -98,6 +100,50 @@ struct free_area {
unsigned long nr_free;
};
+/* Used for pages not on another list */
+static inline void add_to_free_area(struct page *page, struct free_area *area,
+ int migratetype)
+{
+ list_add(&page->lru, &area->free_list[migratetype]);
+ area->nr_free++;
+}
+
+/* Used for pages not on another list */
+static inline void add_to_free_area_tail(struct page *page, struct free_area *area,
+ int migratetype)
+{
+ list_add_tail(&page->lru, &area->free_list[migratetype]);
+ area->nr_free++;
+}
+
+/* Used for pages which are on another list */
+static inline void move_to_free_area(struct page *page, struct free_area *area,
+ int migratetype)
+{
+ list_move(&page->lru, &area->free_list[migratetype]);
+}
+
+static inline struct page *get_page_from_free_area(struct free_area *area,
+ int migratetype)
+{
+ return list_first_entry_or_null(&area->free_list[migratetype],
+ struct page, lru);
+}
+
+static inline void del_page_from_free_area(struct page *page,
+ struct free_area *area)
+{
+ list_del(&page->lru);
+ __ClearPageBuddy(page);
+ set_page_private(page, 0);
+ area->nr_free--;
+}
+
+static inline bool free_area_empty(struct free_area *area, int migratetype)
+{
+ return list_empty(&area->free_list[migratetype]);
+}
+
struct pglist_data;
/*