copy_signal() cleanup: kill taskstats_tgid_init() and acct_init_pacct()

Kill unused functions taskstats_tgid_init() and acct_init_pacct() because
we don't use them anywhere after using kmem_cache_zalloc() in
copy_signal().

Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/acct.h

@@ -123,14 +123,12 @@ struct pacct_struct;
 struct pid_namespace;
 extern void acct_auto_close_mnt(struct vfsmount *m);
 extern void acct_auto_close(struct super_block *sb);
-extern void acct_init_pacct(struct pacct_struct *pacct);
 extern void acct_collect(long exitcode, int group_dead);
 extern void acct_process(void);
 extern void acct_exit_ns(struct pid_namespace *);
 #else
 #define acct_auto_close_mnt(x)	do { } while (0)
 #define acct_auto_close(x)	do { } while (0)
-#define acct_init_pacct(x)	do { } while (0)
 #define acct_collect(x,y)	do { } while (0)
 #define acct_process()		do { } while (0)
 #define acct_exit_ns(ns)	do { } while (0)

include/linux/taskstats_kern.h

@@ -14,11 +14,6 @@
 extern struct kmem_cache *taskstats_cache;
 extern struct mutex taskstats_exit_mutex;
 
-static inline void taskstats_tgid_init(struct signal_struct *sig)
-{
-	sig->stats = NULL;
-}
-
 static inline void taskstats_tgid_free(struct signal_struct *sig)
 {
 	if (sig->stats)
@@ -30,8 +25,6 @@ extern void taskstats_init_early(void);
 #else
 static inline void taskstats_exit(struct task_struct *tsk, int group_dead)
 {}
-static inline void taskstats_tgid_init(struct signal_struct *sig)
-{}
 static inline void taskstats_tgid_free(struct signal_struct *sig)
 {}
 static inline void taskstats_init_early(void)

kernel/acct.c

@@ -587,16 +587,6 @@ out:
 	revert_creds(orig_cred);
 }
 
-/**
- * acct_init_pacct - initialize a new pacct_struct
- * @pacct: per-process accounting info struct to initialize
- */
-void acct_init_pacct(struct pacct_struct *pacct)
-{
-	memset(pacct, 0, sizeof(struct pacct_struct));
-	pacct->ac_utime = pacct->ac_stime = cputime_zero;
-}
-
 /**
  * acct_collect - collect accounting information into pacct_struct
  * @exitcode: task exit code