linux-kernel - Re: [PATCH, RFC] Remove fasync() BKL usage, take 3325

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Message-ID: <20090128173618.GA3174@infradead.org>
Date:	Wed, 28 Jan 2009 12:36:18 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>, hch@...radead.org,
	corbet@....net, linux-kernel@...r.kernel.org,
	viro@...IV.linux.org.uk, linux-api@...r.kernel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [PATCH, RFC] Remove fasync() BKL usage, take 3325

On Wed, Jan 28, 2009 at 04:14:39AM +0100, Oleg Nesterov wrote:
> I didn't send the actual patch. The idea is,
> 
> 	can't we use O_LOCK_FLAGS bit? I agree, it is a bit ugly,
> 	and I won't insist if you don't like is.
> 
> 		static inline int try_lock_f_flags(struct file *file)
> 		{
> 			return !test_and_set_bit(O_LOCK_FLAGS, file->f_flags);
> 		}

->f_flags is an unsigned int and the bit macros need an unsigned long.
Increasing the size of struct file for this is probably a bad idea.

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