linux-kernel - RE: [PATCH tip/core/rcu 02/20] torture: Prepare scripting for shift from %p to %pK

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Date:   Mon, 4 Dec 2017 14:13:38 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "'paulmck@...ux.vnet.ibm.com'" <paulmck@...ux.vnet.ibm.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "jiangshanlai@...il.com" <jiangshanlai@...il.com>,
        "dipankar@...ibm.com" <dipankar@...ibm.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mathieu.desnoyers@...icios.com" <mathieu.desnoyers@...icios.com>,
        "josh@...htriplett.org" <josh@...htriplett.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "dhowells@...hat.com" <dhowells@...hat.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "fweisbec@...il.com" <fweisbec@...il.com>,
        "oleg@...hat.com" <oleg@...hat.com>
Subject: RE: [PATCH tip/core/rcu 02/20] torture: Prepare scripting for shift
 from %p to %pK

From: Paul E. McKenney
> Sent: 04 December 2017 13:42
> On Mon, Dec 04, 2017 at 12:32:30PM +0000, David Laight wrote:
> > From: Paul E. McKenney
> > > Sent: 01 December 2017 20:09
> > >
> > > Because %p prints "(null)" and %pK prints "0000000000000000" or (on
> > > 32-bit systems) "00000000", this commit adjusts torture-test scripting
> > > accordingly.
> >
> > Surely NULL v not-NULL is one bit of info that the message needs to contain?
> 
> Indeed.  So the script needs to check for the strings "00000000",
> "0000000000000000", and "(null) in the console output".  The "(null)"
> is what "%p" prints for a NULL pointer, and the other two strings are
> what "%pK" prints for a NULL pointer.
> 
> Or am I missing your point?

I was thinking that even %pK should print "(null)".

Perhaps it should have printed a fixed, non-zero value for non-zero
pointers.

	David