mem: generalize page_in_parent function and make it extern

If we want to dedup anon shared memory we need to call page_in_parent.
So we need to make it extern.
Also in case of anon shared mem we have only 1 bit per page so we have to
change page_in_parent signature.
Signed-off-by: Fyodor Bocharov <fbocharov@yandex.ru>
Signed-off-by: Eugene Batalov <eabatalov89@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/include/mem.h

 #ifndef __CR_MEM_H__
 #define __CR_MEM_H__
 
+#include <stdbool.h>
+
 struct parasite_ctl;
 struct vm_area_list;
 struct page_pipe;
 struct pstree_item;
 
+extern bool page_in_parent(bool dirty);
 extern int prepare_mm_pid(struct pstree_item *i);
 extern int do_task_reset_dirty_track(int pid);
 extern unsigned int dump_pages_args_size(struct vm_area_list *vmas);

criu/mem.c

@@ -113,14 +113,14 @@ static inline bool should_dump_page(VmaEntry *vmae, u64 pme)
 	return false;
 }
 
-static inline bool page_in_parent(u64 pme)
+bool page_in_parent(bool dirty)
 {
 	/*
 	 * If we do memory tracking, but w/o parent images,
 	 * then we have to dump all memory
 	 */
 
-	return opts.track_mem && opts.img_parent && !(pme & PME_SOFT_DIRTY);
+	return opts.track_mem && opts.img_parent && !dirty;
 }
 
 /*
@@ -156,7 +156,7 @@ static int generate_iovs(struct vma_area *vma, struct page_pipe *pp, u64 *map, u
 		 * page. The latter would be checked in page-xfer.
 		 */
 
-		if (has_parent && page_in_parent(at[pfn])) {
+		if (has_parent && page_in_parent(at[pfn] & PME_SOFT_DIRTY)) {
 			ret = page_pipe_add_hole(pp, vaddr);
 			pages[0]++;
 		} else {