linux-kernel - Re: [PATCH tip/core/rcu 07/45] torture: Allow variations of "defconfig" to be specified

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Message-ID: <20140508015408.GA10988@thin>
Date:	Wed, 7 May 2014 18:54:08 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, oleg@...hat.com, sbw@....edu
Subject: Re: [PATCH tip/core/rcu 07/45] torture: Allow variations of
 "defconfig" to be specified

On Wed, May 07, 2014 at 04:52:40PM -0700, Paul E. McKenney wrote:
> On Wed, May 07, 2014 at 02:22:19PM -0700, josh@...htriplett.org wrote:
> > On Mon, Apr 28, 2014 at 05:24:55PM -0700, Paul E. McKenney wrote:
> > > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > > 
> > > Some environments require some variation on "make defconfig" to initialize
> > > the .config file.  This commit therefore adds a --defconfig argument to
> > > allow this to be specified.  The default value is of course "defconfig".
> > > 
> > > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > 
> > <bikeshed color="blue">
> > "--defconfig randconfig" or "--defconfig allyesconfig" or similar seems
> > rather odd; how about calling it --kconfig or similar?
> > </bikeshed>
> 
> Some day I am going to have to feed that to a browser and see what
> happens.  ;-)
> 
> I must confess that I hadn't considered feeding randconfig or allyesconfig
> to that argument, partly because I figured that I would have to also
> supply Kconfig constraints in those cases in order to ensure that the
> resulting kernel would actually run under qemu.  I was instead thinking
> in terms of a --configs option beginning with "RAND", which would pick
> up the Kconfig constraints from the appropriate configs directory,
> for example:
> 
> 	tools/testing/selftests/rcutorture/configs/rcu/RAND1
> 
> That said, I haven't thought that far down that path.
> 
> So for the --defconfig argument, I was thinking more in terms of things
> like pseries_defconfig or versatile_defconfig.

Ah, I see.  --defconfig specifies the base configuration, while
--configs specifies the constraints.  In that case, how about
--baseconfig?  It might still make sense to pass --baseconfig
allnoconfig or --baseconfig allyesconfig or --baseconfig randconfig,
given a sufficiently complete constraints file.

- Josh Triplett
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