linux-kernel - Re: [PATCH 2.6.20-rc4 4/4][RFC] sys

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Date:	Thu, 11 Jan 2007 13:49:04 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Pierre Peiffer <pierre.peiffer@...l.net>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Dinakar Guniguntala <dino@...ibm.com>,
	Jean-Pierre Dion <jean-pierre.dion@...l.net>,
	Ingo Molnar <mingo@...e.hu>,
	Ulrich Drepper <drepper@...hat.com>,
	Jakub Jelinek <jakub@...hat.com>,
	Darren Hart <dvhltc@...ibm.com>,
	Sébastien Dugué 
	<sebastien.dugue@...l.net>
Subject: Re: [PATCH 2.6.20-rc4 4/4][RFC] sys_futex64 : allows 64bit futexes

On Tue, 09 Jan 2007 17:25:26 +0100
Pierre Peiffer <pierre.peiffer@...l.net> wrote:

>   static inline int
> +futex_atomic_op_inuser64 (int encoded_op, u64 __user *uaddr)

Your email client performs space-stuffing.  Please see if you can turn that
off.  (It's fixable at my end with s/^ /^/g but it's a nuisance).

> +{
> +	int op = (encoded_op >> 28) & 7;
> +	int cmp = (encoded_op >> 24) & 15;
> +	u64 oparg = (encoded_op << 8) >> 20;
> +	u64 cmparg = (encoded_op << 20) >> 20;
> +	u64 oldval = 0, ret, tem;
> +
> +	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
> +		oparg = 1 << oparg;
> +
> +	if (! access_ok (VERIFY_WRITE, uaddr, sizeof(u64)))
> +		return -EFAULT;
> +
> +	inc_preempt_count();

What is that open-coded, uncommented inc_preempt_count() doing in there?
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