linux-kernel - Re: [PATCH v4 3/3] cred: change keyctl_session_to_parent() to use task_work

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Message-ID: <27037.1334672580@redhat.com>
Date:	Tue, 17 Apr 2012 15:23:00 +0100
From:	David Howells <dhowells@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	dhowells@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexander Gordeev <agordeev@...hat.com>,
	Chris Zankel <chris@...kel.net>,
	David Smith <dsmith@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Larry Woodman <lwoodman@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/3] cred: change keyctl_session_to_parent() to use task_work_add()

Oleg Nesterov <oleg@...hat.com> wrote:

> -	int ret;
> +	struct cred *cred;
> +	int err;

There's no need to change ret to be err.  It produces slightly less churn if
you don't.

> +	err = -ENOMEM;
> +	newwork = kmalloc(sizeof(struct task_work), GFP_KERNEL);
> +	if (!newwork)
> +		goto error_keyring;

This passes unnecessarily through kfree(newwork).  Please add a new goto label
and go to that.

> -/*
> - * Replace a process's session keyring on behalf of one of its children when
> - * the target  process is about to resume userspace execution.
> - */

Please don't delete the banner comment saying what the function does.

> -void key_replace_session_keyring(void)
> +void key_change_session_keyring(struct task_work *twork)

There's no particular need to change the name of the function.

David
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