linux-kernel - Re: [RFC][PATCH 4/6] SRCU free VMAs

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Message-ID: <5448D515.90006@cn.fujitsu.com>
Date:	Thu, 23 Oct 2014 18:14:45 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	<torvalds@...ux-foundation.org>, <paulmck@...ux.vnet.ibm.com>,
	<tglx@...utronix.de>, <akpm@...ux-foundation.org>,
	<riel@...hat.com>, <mgorman@...e.de>, <oleg@...hat.com>,
	<mingo@...hat.com>, <minchan@...nel.org>,
	<kamezawa.hiroyu@...fujitsu.com>, <viro@...iv.linux.org.uk>,
	<dave@...olabs.net>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>
Subject: Re: [RFC][PATCH 4/6] SRCU free VMAs


>  
> +struct vm_area_struct *find_vma_srcu(struct mm_struct *mm, unsigned long addr)
> +{
> +	struct vm_area_struct *vma;
> +	unsigned int seq;
> +
> +	WARN_ON_ONCE(!srcu_read_lock_held(&vma_srcu));
> +
> +	do {
> +		seq = read_seqbegin(&mm->mm_seq);
> +		vma = __find_vma(mm, addr);

will the __find_vma() loops for ever due to the rotations in the RBtree?

> +	} while (read_seqretry(&mm->mm_seq, seq));
> +
> +	return vma;
> +}
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