[Patch 1/9] fs/exec.c: export free_arg_pages

[WANG Cong]

free_arg_pages() is used to clean the pages allocated by copy_strings_kenrel().
Since copy_strings_kernel() is exported, so should be free_arg_pages().

Signed-off-by: WANG Cong <wangcong@xxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>

---
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index b512e48..a2bfa57 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -96,6 +96,7 @@ extern int setup_arg_pages(struct linux_binprm * bprm,
 			   int executable_stack);
 extern int bprm_mm_init(struct linux_binprm *bprm);
 extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
+extern void free_arg_pages(struct linux_binprm *bprm);
 extern void compute_creds(struct linux_binprm *binprm);
 extern int do_coredump(long signr, int exit_code, struct pt_regs * regs);
 extern int set_binfmt(struct linux_binfmt *new);
diff --git a/fs/exec.c b/fs/exec.c
index aeaa979..b49ba41 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -210,7 +210,7 @@ static void free_arg_page(struct linux_binprm *bprm, int i)
 {
 }
 
-static void free_arg_pages(struct linux_binprm *bprm)
+void free_arg_pages(struct linux_binprm *bprm)
 {
 }
 
@@ -301,7 +301,7 @@ static void free_arg_page(struct linux_binprm *bprm, int i)
 	}
 }
 
-static void free_arg_pages(struct linux_binprm *bprm)
+void free_arg_pages(struct linux_binprm *bprm)
 {
 	int i;
 
@@ -327,6 +327,8 @@ static bool valid_arg_len(struct linux_binprm *bprm, long len)
 
 #endif /* CONFIG_MMU */
 
+EXPORT_SYMBOL(free_arg_pages);
+
 /*
  * Create a new mm_struct and populate it with a temporary stack
  * vm_area_struct.  We don't have enough context at this point to set the stack
--
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