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Re: [PATCH v2 2.6.38-rc8-tip 5/20] 5: Uprobes: register/unregister probes.
- From: Steven Rostedt <rostedt at goodmis dot org>
- To: Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>
- Cc: Peter Zijlstra <peterz at infradead dot org>, Ingo Molnar <mingo at elte dot hu>, Linux-mm <linux-mm at kvack dot org>, Arnaldo Carvalho de Melo <acme at infradead dot org>, Linus Torvalds <torvalds at linux-foundation dot org>, Christoph Hellwig <hch at infradead dot org>, Masami Hiramatsu <masami dot hiramatsu dot pt at hitachi dot com>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, Oleg Nesterov <oleg at redhat dot com>, LKML <linux-kernel at vger dot kernel dot org>, SystemTap <systemtap at sources dot redhat dot com>, Jim Keniston <jkenisto at linux dot vnet dot ibm dot com>, Roland McGrath <roland at hack dot frob dot com>, Andi Kleen <andi at firstfloor dot org>, Andrew Morton <akpm at linux-foundation dot org>, "Paul E. McKenney" <paulmck at linux dot vnet dot ibm dot com>
- Date: Mon, 14 Mar 2011 12:00:33 -0400
- Subject: Re: [PATCH v2 2.6.38-rc8-tip 5/20] 5: Uprobes: register/unregister probes.
- References: <20110314133403.27435.7901.sendpatchset@localhost6.localdomain6> <20110314133454.27435.81020.sendpatchset@localhost6.localdomain6>
On Mon, 2011-03-14 at 19:04 +0530, Srikar Dronamraju wrote:
> +/* Returns 0 if it can install one probe */
> +int register_uprobe(struct inode *inode, loff_t offset,
> + struct uprobe_consumer *consumer)
> +{
> + struct prio_tree_iter iter;
> + struct list_head tmp_list;
> + struct address_space *mapping;
> + struct mm_struct *mm, *tmpmm;
> + struct vm_area_struct *vma;
> + struct uprobe *uprobe;
> + int ret = -1;
> +
> + if (!inode || !consumer || consumer->next)
> + return -EINVAL;
> + uprobe = uprobes_add(inode, offset);
What happens if uprobes_add() returns NULL?
-- Steve
> + INIT_LIST_HEAD(&tmp_list);
> +
> + mapping = inode->i_mapping;
> +
> + mutex_lock(&uprobes_mutex);
> + if (uprobe->consumers) {
> + ret = 0;
> + goto consumers_add;
> + }