linux-kernel - Re: [PATCH v7 3.2-rc2 4/30] uprobes: Define hooks for mmap/munmap.

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Message-ID: <1322068430.14799.85.camel@twins>
Date:	Wed, 23 Nov 2011 18:13:50 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Roland McGrath <roland@...k.frob.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Anton Arapov <anton@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Stephen Wilson <wilsons@...rt.ca>
Subject: Re: [PATCH v7 3.2-rc2 4/30] uprobes: Define hooks for mmap/munmap.

On Fri, 2011-11-18 at 16:37 +0530, Srikar Dronamraju wrote:
> +int mmap_uprobe(struct vm_area_struct *vma)
> +{
> +       struct list_head tmp_list;
> +       struct uprobe *uprobe, *u;
> +       struct inode *inode;
> +       int ret = 0, count = 0;
> +
> +       if (!atomic_read(&uprobe_events) || !valid_vma(vma, true))
> +               return ret;     /* Bail-out */
> +
> +       inode = igrab(vma->vm_file->f_mapping->host);
> +       if (!inode)
> +               return ret; 

Since we hold mmap_sem, vma is pinned, which should pin the inode, why
take out another ref?
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