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Date: Thu, 2 Aug 2012 16:17:57 +0200
From: Oleg Nesterov <oleg@redhat.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Anton Arapov <anton@redhat.com>,
        "Frank Ch. Eigler" <fche@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        William Cohen <wcohen@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] uprobes: Ignore unsupported instructions in uprobe_mmap
Message-ID: <20120802141757.GA5064@redhat.com>
References: <20120728163157.GA22719@redhat.com> <20120731064730.GB5087@linux.vnet.ibm.com> <20120731124805.GA485@redhat.com> <20120802100515.GC5782@linux.vnet.ibm.com>
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Forgot to mention...

On 08/02, Srikar Dronamraju wrote:
>
> While at it, add a missing put_uprobe() in the path where uprobe_mmap()
> races with uprobe_unregister().
> ...
> @@ -1051,8 +1051,10 @@ int uprobe_mmap(struct vm_area_struct *vma)
>  			if (ret == -EEXIST) {
>  				ret = 0;
>
> -				if (!is_swbp_at_addr(vma->vm_mm, vaddr))
> +				if (!is_swbp_at_addr(vma->vm_mm, vaddr)) {
> +					put_uprobe(uprobe);
>  					continue;
> +				}

Yes, this part looks correct.

In fact, I think this is not really correct anyway (wrt counter)
but we are going to kill it.

Oleg.