linux-kernel - Re: [PATCH 3/3] p9auth: add p9auth driver

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Message-ID: <23120.1271846955@redhat.com>
Date:	Wed, 21 Apr 2010 11:49:15 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	dhowells@...hat.com, lkml <linux-kernel@...r.kernel.org>,
	Ashwin Ganti <ashwin.ganti@...il.com>,
	Greg KH <greg@...ah.com>, rsc@...ch.com, ericvh@...il.com,
	linux-security-module@...r.kernel.org,
	Ron Minnich <rminnich@...il.com>, jt.beard@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrew Morgan <morgan@...nel.org>, oleg@...ibm.com,
	Eric Paris <eparis@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-api@...r.kernel.org, Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH 3/3] p9auth: add p9auth driver

Serge E. Hallyn <serue@...ibm.com> wrote:

> +	if (ret == 0)
> +		commit_creds(new);
> +	else
> +		abort_creds(new);
> +
> +	return ret;

If you make this:

	if (ret == 0)
		return commit_creds(new);
	abort_creds(new);
	return ret;

then gcc can tail-call commit_creds(), which is guaranteed to return 0.

David
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