2009-12-01 22:12:30

by Veaceslav Falico

Subject: [PATCH 2/4] copy_signal cleanup: clean acct_init_pacct() and taskstats_tgid_init()

Remove unneeded initializations in acct_init_pacct() and taskstats_tgid_init().
These are accessed only via copy_signal().

Signed-off-by: Veaceslav Falico <[email protected]>
---

diff --git a/include/linux/taskstats_kern.h b/include/linux/taskstats_kern.h
index 3398f45..d66167a 100644
--- a/include/linux/taskstats_kern.h
+++ b/include/linux/taskstats_kern.h
@@ -16,7 +16,6 @@ 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)
diff --git a/kernel/acct.c b/kernel/acct.c
index 9a4715a..8909c26 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -592,8 +592,6 @@ out:
*/
void acct_init_pacct(struct pacct_struct *pacct)
{
- memset(pacct, 0, sizeof(struct pacct_struct));
- pacct->ac_utime = pacct->ac_stime = cputime_zero;
}

/**

2009-12-02 14:12:00

by Oleg Nesterov

Subject: Re: [PATCH 2/4] copy_signal cleanup: clean acct_init_pacct() and taskstats_tgid_init()

On 12/01, Veaceslav Falico wrote:
>
> Remove unneeded initializations in acct_init_pacct() and taskstats_tgid_init().
> These are accessed only via copy_signal().
>
> Signed-off-by: Veaceslav Falico <[email protected]>
> ---
>
> diff --git a/include/linux/taskstats_kern.h b/include/linux/taskstats_kern.h
> index 3398f45..d66167a 100644
> --- a/include/linux/taskstats_kern.h
> +++ b/include/linux/taskstats_kern.h
> @@ -16,7 +16,6 @@ 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)
> diff --git a/kernel/acct.c b/kernel/acct.c
> index 9a4715a..8909c26 100644
> --- a/kernel/acct.c
> +++ b/kernel/acct.c
> @@ -592,8 +592,6 @@ out:
> */
> void acct_init_pacct(struct pacct_struct *pacct)
> {
> - memset(pacct, 0, sizeof(struct pacct_struct));
> - pacct->ac_utime = pacct->ac_stime = cputime_zero;
> }

Looks good imho. But please note that with this patch both
taskstats_tgid_init() and acct_init_pacct() become empty, and we
already have "empty" definitions for #ifndef case.

Perhaps it makes sense to move this (now empty) helper outside
of #ifdef, or just kill it.

Up to maintainres.

Oleg.