From 0bdb080c70495ea4efbed7661b4fe6100bd5adde Mon Sep 17 00:00:00 2001
From: Dominik Sliwa <dominik.sliwa@toradex.com>
Date: Thu, 21 Feb 2019 10:23:08 +0100
Subject: Revert "backports: Remove unused parts"

This reverts commit ab3fd3b9a801a9faa2619e2e65207e736f859a6d.
---
 backport/backport-include/linux/mm.h | 96 ++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)

(limited to 'backport/backport-include/linux/mm.h')

diff --git a/backport/backport-include/linux/mm.h b/backport/backport-include/linux/mm.h
index b28156d3..587aa8dc 100644
--- a/backport/backport-include/linux/mm.h
+++ b/backport/backport-include/linux/mm.h
@@ -12,6 +12,102 @@
 void kvfree(const void *addr);
 #endif /* < 3.15 */
 
+#if LINUX_VERSION_IS_LESS(3,20,0)
+#define get_user_pages_locked LINUX_BACKPORT(get_user_pages_locked)
+long get_user_pages_locked(unsigned long start, unsigned long nr_pages,
+		    int write, int force, struct page **pages, int *locked);
+#define get_user_pages_unlocked LINUX_BACKPORT(get_user_pages_unlocked)
+long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
+		    int write, int force, struct page **pages);
+#elif LINUX_VERSION_IS_LESS(4,6,0)
+static inline
+long backport_get_user_pages_locked(unsigned long start, unsigned long nr_pages,
+		    int write, int force, struct page **pages, int *locked)
+{
+	return get_user_pages_locked(current, current->mm, start, nr_pages,
+		    write, force, pages, locked);
+}
+#define get_user_pages_locked LINUX_BACKPORT(get_user_pages_locked)
+
+static inline
+long backport_get_user_pages_unlocked(unsigned long start, unsigned long nr_pages,
+				      int write, int force, struct page **pages)
+{
+	return get_user_pages_unlocked(current, current->mm, start,  nr_pages,
+		    write, force, pages);
+}
+#define get_user_pages_unlocked LINUX_BACKPORT(get_user_pages_unlocked)
+#endif
+
+#if LINUX_VERSION_IS_LESS(4,6,0)
+static inline
+long backport_get_user_pages(unsigned long start, unsigned long nr_pages,
+			    int write, int force, struct page **pages,
+			    struct vm_area_struct **vmas)
+{
+	return get_user_pages(current, current->mm, start,  nr_pages,
+		    write, force, pages, vmas);
+}
+#define get_user_pages LINUX_BACKPORT(get_user_pages)
+#endif
+
+#ifndef FOLL_TRIED
+#define FOLL_TRIED	0x800	/* a retry, previous pass started an IO */
+#endif
+
+#ifdef CPTCFG_BPAUTO_BUILD_FRAME_VECTOR
+/* Container for pinned pfns / pages */
+struct frame_vector {
+	unsigned int nr_allocated;	/* Number of frames we have space for */
+	unsigned int nr_frames;	/* Number of frames stored in ptrs array */
+	bool got_ref;		/* Did we pin pages by getting page ref? */
+	bool is_pfns;		/* Does array contain pages or pfns? */
+	void *ptrs[0];		/* Array of pinned pfns / pages. Use
+				 * pfns_vector_pages() or pfns_vector_pfns()
+				 * for access */
+};
+
+struct frame_vector *frame_vector_create(unsigned int nr_frames);
+void frame_vector_destroy(struct frame_vector *vec);
+int get_vaddr_frames(unsigned long start, unsigned int nr_pfns,
+		     bool write, bool force, struct frame_vector *vec);
+void put_vaddr_frames(struct frame_vector *vec);
+int frame_vector_to_pages(struct frame_vector *vec);
+void frame_vector_to_pfns(struct frame_vector *vec);
+
+static inline unsigned int frame_vector_count(struct frame_vector *vec)
+{
+	return vec->nr_frames;
+}
+
+static inline struct page **frame_vector_pages(struct frame_vector *vec)
+{
+	if (vec->is_pfns) {
+		int err = frame_vector_to_pages(vec);
+
+		if (err)
+			return ERR_PTR(err);
+	}
+	return (struct page **)(vec->ptrs);
+}
+
+static inline unsigned long *frame_vector_pfns(struct frame_vector *vec)
+{
+	if (!vec->is_pfns)
+		frame_vector_to_pfns(vec);
+	return (unsigned long *)(vec->ptrs);
+}
+#endif
+
+#if LINUX_VERSION_IS_LESS(4,1,9) && \
+     LINUX_VERSION_IS_GEQ(3,6,0)
+#define page_is_pfmemalloc LINUX_BACKPORT(page_is_pfmemalloc)
+static inline bool page_is_pfmemalloc(struct page *page)
+{
+	return page->pfmemalloc;
+}
+#endif /* < 4.2 */
+
 #if LINUX_VERSION_IS_LESS(4,12,0)
 #define kvmalloc LINUX_BACKPORT(kvmalloc)
 static inline void *kvmalloc(size_t size, gfp_t flags)
-- 
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