ANDROID: mm: export symbol for vendor module

export symbols for vendor module for custom madvise behavior
- mm_access, pidfd_get_pid, swp_swapcount

Bug: 351175506
Change-Id: I55a48d09fa61b74a00eba32723eca16153d309ec
Signed-off-by: Sooyong Suk <s.suk@samsung.corp-partner.google.com>

kernel/fork.c

@@ -1583,6 +1583,7 @@ struct mm_struct *mm_access(struct task_struct *task, unsigned int mode)
 
 	return mm;
 }
+EXPORT_SYMBOL_GPL(mm_access);
 
 static void complete_vfork_done(struct task_struct *tsk)
 {

kernel/pid.c

@@ -553,6 +553,7 @@ struct pid *pidfd_get_pid(unsigned int fd, unsigned int *flags)
 	fdput(f);
 	return pid;
 }
+EXPORT_SYMBOL_GPL(pidfd_get_pid);
 
 /**
  * pidfd_get_task() - Get the task associated with a pidfd

mm/swapfile.c

@@ -1785,6 +1785,7 @@ out:
 	unlock_cluster_or_swap_info(si, ci);
 	return count;
 }
+EXPORT_SYMBOL_GPL(swp_swapcount);
 
 static bool swap_page_trans_huge_swapped(struct swap_info_struct *si,
 					 swp_entry_t entry, int order)