linux-kernel - Re: [PATCH] AFS: Fix file locking

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Date:	Tue, 17 Jul 2007 17:50:17 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] AFS: Fix file locking

On Tue, 17 Jul 2007 13:47:32 +0100
David Howells <dhowells@...hat.com> wrote:

> +	if (type == AFS_LOCK_READ &&
> +	    vnode->flags & (1 << AFS_VNODE_READLOCKED)) {

Here we use

	vnode->flags & (1 << foo)

> +		set_bit(AFS_VNODE_LOCKING, &vnode->flags);

and elsewhere we use set_bit(foo, &vnode->flags) and clear_bit()

This is a bit strange.  Does the open-coded bit-test have any performance
benefit on any architecture?  Not on x86 at least, afaik.

Please consider converting all that stuff to test_bit() sometime.  It sure
would look a lot better.

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