linux-kernel - Re: [PATCH 4/4] copy_signal cleanup: clean tty_audit

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Date:	Wed, 2 Dec 2009 15:15:33 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Veaceslav Falico <vfalico@...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>
Subject: Re: [PATCH 4/4] copy_signal cleanup: clean tty_audit_fork()

On 12/01, Veaceslav Falico wrote:
>
> Remove unneeded initialization in tty_audit_fork().
>
> Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
> ---
>
> diff --git a/drivers/char/tty_audit.c b/drivers/char/tty_audit.c
> index ac16fbe..283a15b 100644
> --- a/drivers/char/tty_audit.c
> +++ b/drivers/char/tty_audit.c
> @@ -148,7 +148,6 @@ void tty_audit_fork(struct signal_struct *sig)
>  	spin_lock_irq(&current->sighand->siglock);
>  	sig->audit_tty = current->signal->audit_tty;
>  	spin_unlock_irq(&current->sighand->siglock);
> -	sig->tty_audit_buf = NULL;
>  }

OK, but given that this function is "far" from copy_signal() path
and it is not inline, perhaps it makes sense to add the comment which
explains *sig must be zeroed, and the only caller is copy_signal().


Hmm. Off-topic, but why do we take ->siglock? ->audit_tty is boolean,
afaics ->siglock buys nothing.

Oleg.

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