openwrt/target/linux/generic/patches-3.18/950-vm_exports.patch

--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3377,6 +3377,15 @@ put_path:
 	return res;
 }
 
+void shmem_set_file(struct vm_area_struct *vma, struct file *file)
+{
+	if (vma->vm_file)
+		fput(vma->vm_file);
+	vma->vm_file = file;
+	vma->vm_ops = &shmem_vm_ops;
+}
+EXPORT_SYMBOL_GPL(shmem_set_file);
+
 /**
  * shmem_kernel_file_setup - get an unlinked file living in tmpfs which must be
  * 	kernel internal.  There will be NO LSM permission checks against the
@@ -3416,11 +3425,8 @@ int shmem_zero_setup(struct vm_area_stru
 	file = shmem_file_setup("dev/zero", size, vma->vm_flags);
 	if (IS_ERR(file))
 		return PTR_ERR(file);
+	shmem_set_file(vma, file);
 
-	if (vma->vm_file)
-		fput(vma->vm_file);
-	vma->vm_file = file;
-	vma->vm_ops = &shmem_vm_ops;
 	return 0;
 }
 
--- a/fs/file.c
+++ b/fs/file.c
@@ -216,6 +216,7 @@ static inline void __set_open_fd(int fd,
 {
 	__set_bit(fd, fdt->open_fds);
 }
+EXPORT_SYMBOL_GPL(expand_files);
 
 static inline void __clear_open_fd(int fd, struct fdtable *fdt)
 {
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -461,6 +461,8 @@ static void exit_mm(struct task_struct *
 	mmput(mm);
 	clear_thread_flag(TIF_MEMDIE);
 }
+EXPORT_SYMBOL_GPL(get_files_struct);
+EXPORT_SYMBOL_GPL(put_files_struct);
 
 /*
  * When we die, we re-parent all our children, and try to:
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3147,6 +3147,7 @@ int can_nice(const struct task_struct *p
 	return (nice_rlim <= task_rlimit(p, RLIMIT_NICE) ||
 		capable(CAP_SYS_NICE));
 }
+EXPORT_SYMBOL_GPL(can_nice);
 
 #ifdef __ARCH_WANT_SYS_NICE
 
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1403,6 +1403,7 @@ void zap_page_range(struct vm_area_struc
 	mmu_notifier_invalidate_range_end(mm, start, end);
 	tlb_finish_mmu(&tlb, start, end);
 }
+EXPORT_SYMBOL_GPL(zap_page_range);
 
 /**
  * zap_page_range_single - remove user pages in a given range
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1372,6 +1372,7 @@ struct vm_struct *get_vm_area(unsigned l
 				  NUMA_NO_NODE, GFP_KERNEL,
 				  __builtin_return_address(0));
 }
+EXPORT_SYMBOL_GPL(get_vm_area);
 
 struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
 				const void *caller)
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -49,6 +49,8 @@ extern int shmem_init(void);
 extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
 extern struct file *shmem_file_setup(const char *name,
 					loff_t size, unsigned long flags);
+
+extern void shmem_set_file(struct vm_area_struct *vma, struct file *file);
 extern struct file *shmem_kernel_file_setup(const char *name, loff_t size,
 					    unsigned long flags);
 extern int shmem_zero_setup(struct vm_area_struct *);