linux-kernel - Re: [PATCH] tty: audit: remove unused variable

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Date:	Tue, 23 Feb 2016 08:00:08 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty: audit: remove unused variable

Hi Sudip,

On 02/23/2016 12:30 AM, Sudip Mukherjee wrote:
> While building with W=1 we were getting build warning:
> drivers/tty/tty_audit.c:149:16: warning: variable 'sessionid' set but not used
> 
> The local variable sessionid was only assigned the value of
> current->sessionid but was never reused.

Thanks for catching this.

While reviewing this patch, I noticed entire if clause can be reduced to

	if (audit_enabled)
		tty_audit_log("ioctl=TIOCSTI", dev, &ch, 1);

since auid is unused variable as well.

Regards,
Peter Hurley


> Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
> ---
>  drivers/tty/tty_audit.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c
> index 66d53fc..81fe3fb 100644
> --- a/drivers/tty/tty_audit.c
> +++ b/drivers/tty/tty_audit.c
> @@ -146,10 +146,8 @@ void tty_audit_tiocsti(struct tty_struct *tty, char ch)
>  
>  	if (audit_enabled) {
>  		kuid_t auid;
> -		unsigned int sessionid;
>  
>  		auid = audit_get_loginuid(current);
> -		sessionid = audit_get_sessionid(current);
>  		tty_audit_log("ioctl=TIOCSTI", dev, &ch, 1);
>  	}
>  }
>