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Subject: Re: [PATCH v2 2.6.38-rc8-tip 3/20]  3: uprobes: Breakground page
 replacement.
From: Steven Rostedt <rostedt@goodmis.org>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
        Linux-mm <linux-mm@kvack.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
        Christoph Hellwig <hch@infradead.org>,
        Andi Kleen <andi@firstfloor.org>,
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        Roland McGrath <roland@hack.frob.com>,
        SystemTap <systemtap@sources.redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
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On Mon, 2011-03-14 at 22:54 +0530, Srikar Dronamraju wrote:
> > 
> > I'm confused by the above comment and code. You state we are only
> > interested text pages mapped read-only, but then if the page is mapped
> > read/exec we exit out? It is fine if it is anything but READ/EXEC.
> 
> You are right, it should have been
>         if ((vma->vm_flags & (VM_READ|VM_WRITE|VM_EXEC|VM_SHARED)) !=
>                                         (VM_READ|VM_EXEC))
>                 goto put_out;
> 
> 
Golden rule #12: When the comments do not match the code, they probably
are both wrong ;)

-- Steve


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