linux-kernel - Re: [PATCH] fs: O_* bit numbers uniqueness check

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Message-ID: <4B443695.5090301@gmail.com>
Date:	Wed, 06 Jan 2010 08:07:01 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Al Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Eric Paris <eparis@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] fs: O_* bit numbers uniqueness check

Le 06/01/2010 07:55, Wu Fengguang a écrit :
> The O_* bit numbers are defined in 20+ arch/*, and hence can silently
> overlap. Add a boot time check to ensure the uniqueness as suggested
> by David Miller.
> 
> CC: David Miller <davem@...emloft.net>
> CC: Stephen Rothwell <sfr@...b.auug.org.au>
> CC: Al Viro <viro@...iv.linux.org.uk>
> CC: Christoph Hellwig <hch@...radead.org>
> CC: Eric Paris <eparis@...hat.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> ---
>  {
> +	/* please add new bits here to ensure allocation uniqueness */
> +	BUG_ON(20 != hweight32(
> +		O_RDONLY	| O_WRONLY	| O_RDWR	|
> +		O_CREAT		| O_EXCL	| O_NOCTTY	|
> +		O_TRUNC		| O_APPEND	| O_NONBLOCK	|
> +		O_SYNC		| FASYNC	| O_DIRECT	|
> +		O_LARGEFILE	| O_DIRECTORY	| O_NOFOLLOW	|
> +		O_NOATIME	| O_CLOEXEC	| O_RANDOM	|
> +		FMODE_EXEC	| FMODE_NONOTIFY));
> +

I cannot test it, but given O_RDONLY is 0, are you sure 20 bits are actually set ?
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