linux-kernel - [PATCH] kill taskstats_tgid_init() and acct_init_pacct() and cleanup copy

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Date:	Mon, 7 Dec 2009 20:45:14 +0100
From:	Veaceslav Falico <vfalico@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Miloslav Trmac <mitr@...hat.com>,
	James Morris <jmorris@...ei.org>,
	Alan Cox <alan@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Renaud Lottiaux <renaud.lottiaux@...labs.com>,
	Louis Rilling <louis.rilling@...labs.com>,
	David Howells <dhowells@...hat.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>
Subject: [PATCH] kill taskstats_tgid_init() and acct_init_pacct() and
	cleanup copy_signal()

(on top of previous patchset)

Kill taskstats_tgid_init() and acct_init_pacct() because we don't
need them any more. Cleanup copy_signal() from these functions
and remove the call to task_io_accounting_init() (we can't kill
it because it's still being used by copy_process(), so just removing
it from copy_signal()).

Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
---

--- a/include/linux/taskstats_kern.h	2009-12-07 20:20:02.000000000 +0100
+++ b/include/linux/taskstats_kern.h	2009-12-07 20:20:48.000000000 +0100
@@ -14,10 +14,6 @@
 extern struct kmem_cache *taskstats_cache;
 extern struct mutex taskstats_exit_mutex;
 
-static inline void taskstats_tgid_init(struct signal_struct *sig)
-{
-}
-
 static inline void taskstats_tgid_free(struct signal_struct *sig)
 {
 	if (sig->stats)
@@ -29,8 +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)
--- a/kernel/acct.c	2009-12-07 20:23:43.000000000 +0100
+++ b/kernel/acct.c	2009-12-07 20:24:30.000000000 +0100
@@ -587,14 +587,6 @@ out:
 }
 
 /**
- * acct_init_pacct - initialize a new pacct_struct
- * @pacct: per-process accounting info struct to initialize
- */
-void acct_init_pacct(struct pacct_struct *pacct)
-{
-}
-
-/**
  * acct_collect - collect accounting information into pacct_struct
  * @exitcode: task exit code
  * @group_dead: not 0, if this thread is the last one in the process.
--- a/include/linux/acct.h	2009-12-07 20:26:35.000000000 +0100
+++ b/include/linux/acct.h	2009-12-07 20:26:43.000000000 +0100
@@ -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)
--- a/kernel/fork.c	2009-12-07 20:25:18.000000000 +0100
+++ b/kernel/fork.c	2009-12-07 20:36:49.000000000 +0100
@@ -861,17 +861,12 @@ static int copy_signal(unsigned long clo
 	hrtimer_init(&sig->real_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	sig->real_timer.function = it_real_fn;
 
-	task_io_accounting_init(&sig->ioac);
-	taskstats_tgid_init(sig);
-
 	task_lock(current->group_leader);
 	memcpy(sig->rlim, current->signal->rlim, sizeof sig->rlim);
 	task_unlock(current->group_leader);
 
 	posix_cpu_timers_init_group(sig);
 
-	acct_init_pacct(&sig->pacct);
-
 	tty_audit_fork(sig);
 
 	sig->oom_adj = current->signal->oom_adj;
--
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