mm, thp: remove compound_lock()

We are going to use migration entries to stabilize page counts.  It
means we don't need compound_lock() for that.

Signed-off-by: Kirill A. Shutemov <[email protected]>
Tested-by: Sasha Levin <[email protected]>
Tested-by: Aneesh Kumar K.V <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Acked-by: Jerome Marchand <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Steve Capper <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Rientjes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

2 files changed, 1 insertions, 46 deletions

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 34387351930c..70f59de2e288 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -410,41 +410,6 @@ static inline int is_vmalloc_or_module_addr(const void *x)
 
 extern void kvfree(const void *addr);
 
-static inline void compound_lock(struct page *page)
-{
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	VM_BUG_ON_PAGE(PageSlab(page), page);
-	bit_spin_lock(PG_compound_lock, &page->flags);
-#endif
-}
-
-static inline void compound_unlock(struct page *page)
-{
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	VM_BUG_ON_PAGE(PageSlab(page), page);
-	bit_spin_unlock(PG_compound_lock, &page->flags);
-#endif
-}
-
-static inline unsigned long compound_lock_irqsave(struct page *page)
-{
-	unsigned long uninitialized_var(flags);
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	local_irq_save(flags);
-	compound_lock(page);
-#endif
-	return flags;
-}
-
-static inline void compound_unlock_irqrestore(struct page *page,
-					      unsigned long flags)
-{
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	compound_unlock(page);
-	local_irq_restore(flags);
-#endif
-}
-
 /*
  * The atomic page->_mapcount, starts from -1: so that transitions
  * both from it and to it can be tracked, using atomic_inc_and_test
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 7bc7fd9c4c5c..0c42acca0338 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -101,9 +101,6 @@ enum pageflags {
 #ifdef CONFIG_MEMORY_FAILURE
 	PG_hwpoison,		/* hardware poisoned page. Don't touch */
 #endif
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-	PG_compound_lock,
-#endif
 #if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
 	PG_young,
 	PG_idle,
@@ -613,12 +610,6 @@ static inline void ClearPageSlabPfmemalloc(struct page *page)
 #define __PG_MLOCKED		0
 #endif
 
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-#define __PG_COMPOUND_LOCK		(1 << PG_compound_lock)
-#else
-#define __PG_COMPOUND_LOCK		0
-#endif
-
 /*
  * Flags checked when a page is freed.  Pages being freed should not have
  * these flags set.  It they are, there is a problem.
@@ -628,8 +619,7 @@ static inline void ClearPageSlabPfmemalloc(struct page *page)
 	 1 << PG_private | 1 << PG_private_2 | \
 	 1 << PG_writeback | 1 << PG_reserved | \
 	 1 << PG_slab	 | 1 << PG_swapcache | 1 << PG_active | \
-	 1 << PG_unevictable | __PG_MLOCKED | \
-	 __PG_COMPOUND_LOCK)
+	 1 << PG_unevictable | __PG_MLOCKED)
 
 /*
  * Flags checked when a page is prepped for return by the page allocator.