mm/hmm: avoid bloating arch that do not make use of HMM

This moves all new code including new page migration helper behind kernel Kconfig option so that there is no codee bloat for arch or user that do not want to use HMM or any of its associated features. arm allyesconfig (without all the patchset, then with and this patch): text data bss dec hex filename 83721896 46511131 27582964 157815991 96814b7 ../without/vmlinux 83722364 46511131 27582964 157816459 968168b vmlinux [[email protected]: struct hmm is only use by HMM mirror functionality] Link: http://lkml.kernel.org/r/[email protected] [[email protected]: fix build (arm multi_v7_defconfig)] Link: http://lkml.kernel.org/r/[email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Jérôme Glisse <[email protected]> Signed-off-by: Stephen Rothwell <[email protected]> Cc: Dan Williams <[email protected]> Cc: Arnd Bergmann <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
chewitt · Sep 9, 2017 · 6b368cd · 6b368cd
1 parent d3df0a4
commit 6b368cd
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Showing 8 changed files with 54 additions and 32 deletions.
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
@@ -501,18 +501,21 @@ void hmm_device_put(struct hmm_device *hmm_device);
 
 
 /* Below are for HMM internal use only! Not to be used by device driver! */
+#if IS_ENABLED(CONFIG_HMM_MIRROR)
 void hmm_mm_destroy(struct mm_struct *mm);
 
 static inline void hmm_mm_init(struct mm_struct *mm)
 {
 	mm->hmm = NULL;
 }
+#else /* IS_ENABLED(CONFIG_HMM_MIRROR) */
+static inline void hmm_mm_destroy(struct mm_struct *mm) {}
+static inline void hmm_mm_init(struct mm_struct *mm) {}
+#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
 
-#else /* IS_ENABLED(CONFIG_HMM) */
 
-/* Below are for HMM internal use only! Not to be used by device driver! */
+#else /* IS_ENABLED(CONFIG_HMM) */
 static inline void hmm_mm_destroy(struct mm_struct *mm) {}
 static inline void hmm_mm_init(struct mm_struct *mm) {}
-
 #endif /* IS_ENABLED(CONFIG_HMM) */
 #endif /* LINUX_HMM_H */
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
@@ -138,18 +138,6 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
 struct dev_pagemap *find_dev_pagemap(resource_size_t phys);
 
 static inline bool is_zone_device_page(const struct page *page);
-
-static inline bool is_device_private_page(const struct page *page)
-{
-	return is_zone_device_page(page) &&
-		page->pgmap->type == MEMORY_DEVICE_PRIVATE;
-}
-
-static inline bool is_device_public_page(const struct page *page)
-{
-	return is_zone_device_page(page) &&
-		page->pgmap->type == MEMORY_DEVICE_PUBLIC;
-}
 #else
 static inline void *devm_memremap_pages(struct device *dev,
 		struct resource *res, struct percpu_ref *ref,
@@ -168,17 +156,21 @@ static inline struct dev_pagemap *find_dev_pagemap(resource_size_t phys)
 {
 	return NULL;
 }
+#endif
 
+#if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC)
 static inline bool is_device_private_page(const struct page *page)
 {
-	return false;
+	return is_zone_device_page(page) &&
+		page->pgmap->type == MEMORY_DEVICE_PRIVATE;
 }
 
 static inline bool is_device_public_page(const struct page *page)
 {
-	return false;
+	return is_zone_device_page(page) &&
+		page->pgmap->type == MEMORY_DEVICE_PUBLIC;
 }
-#endif
+#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
 
 /**
  * get_dev_pagemap() - take a new live reference on the dev_pagemap for @pfn

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
@@ -265,13 +265,26 @@ struct migrate_vma_ops {
 				 void *private);
 };
 
+#if defined(CONFIG_MIGRATE_VMA_HELPER)
 int migrate_vma(const struct migrate_vma_ops *ops,
 		struct vm_area_struct *vma,
 		unsigned long start,
 		unsigned long end,
 		unsigned long *src,
 		unsigned long *dst,
 		void *private);
+#else
+static inline int migrate_vma(const struct migrate_vma_ops *ops,
+			      struct vm_area_struct *vma,
+			      unsigned long start,
+			      unsigned long end,
+			      unsigned long *src,
+			      unsigned long *dst,
+			      void *private)
+{
+	return -EINVAL;
+}
+#endif /* IS_ENABLED(CONFIG_MIGRATE_VMA_HELPER) */
 
 #endif /* CONFIG_MIGRATION */
 

diff --git a/include/linux/mm.h b/include/linux/mm.h
@@ -800,18 +800,27 @@ static inline bool is_zone_device_page(const struct page *page)
 }
 #endif
 
-#if IS_ENABLED(CONFIG_DEVICE_PRIVATE) ||  IS_ENABLED(CONFIG_DEVICE_PUBLIC)
+#if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC)
 void put_zone_device_private_or_public_page(struct page *page);
-#else
+DECLARE_STATIC_KEY_FALSE(device_private_key);
+#define IS_HMM_ENABLED static_branch_unlikely(&device_private_key)
+static inline bool is_device_private_page(const struct page *page);
+static inline bool is_device_public_page(const struct page *page);
+#else /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
 static inline void put_zone_device_private_or_public_page(struct page *page)
 {
 }
+#define IS_HMM_ENABLED 0
+static inline bool is_device_private_page(const struct page *page)
+{
+	return false;
+}
+static inline bool is_device_public_page(const struct page *page)
+{
+	return false;
+}
 #endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
 
-static inline bool is_device_private_page(const struct page *page);
-static inline bool is_device_public_page(const struct page *page);
-
-DECLARE_STATIC_KEY_FALSE(device_private_key);
 
 static inline void get_page(struct page *page)
 {
@@ -834,9 +843,8 @@ static inline void put_page(struct page *page)
 	 * free and we need to inform the device driver through callback. See
 	 * include/linux/memremap.h and HMM for details.
 	 */
-	if (static_branch_unlikely(&device_private_key) &&
-	    unlikely(is_device_private_page(page) ||
-		     is_device_public_page(page))) {
+	if (IS_HMM_ENABLED && unlikely(is_device_private_page(page) ||
+	    unlikely(is_device_public_page(page)))) {
 		put_zone_device_private_or_public_page(page);
 		return;
 	}

diff --git a/mm/Kconfig b/mm/Kconfig
@@ -702,8 +702,12 @@ config ARCH_HAS_HMM
 	depends on MEMORY_HOTREMOVE
 	depends on SPARSEMEM_VMEMMAP
 
+config MIGRATE_VMA_HELPER
+	bool
+
 config HMM
 	bool
+	select MIGRATE_VMA_HELPER
 
 config HMM_MIRROR
 	bool "HMM mirror CPU page table into a device page table"

diff --git a/mm/Makefile b/mm/Makefile
@@ -39,7 +39,7 @@ obj-y			:= filemap.o mempool.o oom_kill.o \
 			   mm_init.o mmu_context.o percpu.o slab_common.o \
 			   compaction.o vmacache.o swap_slots.o \
 			   interval_tree.o list_lru.o workingset.o \
-			   debug.o hmm.o $(mmu-y)
+			   debug.o $(mmu-y)
 
 obj-y += init-mm.o
 
@@ -104,3 +104,4 @@ obj-$(CONFIG_FRAME_VECTOR) += frame_vector.o
 obj-$(CONFIG_DEBUG_PAGE_REF) += debug_page_ref.o
 obj-$(CONFIG_HARDENED_USERCOPY) += usercopy.o
 obj-$(CONFIG_PERCPU_STATS) += percpu-stats.o
+obj-$(CONFIG_HMM) += hmm.o
diff --git a/mm/hmm.c b/mm/hmm.c
@@ -35,15 +35,16 @@
 
 #define PA_SECTION_SIZE (1UL << PA_SECTION_SHIFT)
 
-
+#if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC)
 /*
  * Device private memory see HMM (Documentation/vm/hmm.txt) or hmm.h
  */
 DEFINE_STATIC_KEY_FALSE(device_private_key);
 EXPORT_SYMBOL(device_private_key);
+#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
 
 
-#ifdef CONFIG_HMM
+#if IS_ENABLED(CONFIG_HMM_MIRROR)
 static const struct mmu_notifier_ops hmm_mmu_notifier_ops;
 
 /*
@@ -128,9 +129,7 @@ void hmm_mm_destroy(struct mm_struct *mm)
 {
 	kfree(mm->hmm);
 }
-#endif /* CONFIG_HMM */
 
-#if IS_ENABLED(CONFIG_HMM_MIRROR)
 static void hmm_invalidate_range(struct hmm *hmm,
 				 enum hmm_update_type action,
 				 unsigned long start,

diff --git a/mm/migrate.c b/mm/migrate.c
@@ -2127,6 +2127,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
 
 #endif /* CONFIG_NUMA */
 
+#if defined(CONFIG_MIGRATE_VMA_HELPER)
 struct migrate_vma {
 	struct vm_area_struct	*vma;
 	unsigned long		*dst;
@@ -2980,3 +2981,4 @@ int migrate_vma(const struct migrate_vma_ops *ops,
 	return 0;
 }
 EXPORT_SYMBOL(migrate_vma);
+#endif /* defined(MIGRATE_VMA_HELPER) */