linux-kernel - Re: [PATCH v3 0/2] Ajust lockdep static allocations for sparc

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Message-ID: <20161121071659.GA28747@gmail.com>
Date:   Mon, 21 Nov 2016 08:17:00 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     David Miller <davem@...emloft.net>, babu.moger@...cle.com,
        mingo@...hat.com, akpm@...ux-foundation.org, keescook@...omium.org,
        dan.j.williams@...el.com, aryabinin@...tuozzo.com, tj@...nel.org,
        sam@...nborg.org, linux-kernel@...r.kernel.org,
        sparclinux@...r.kernel.org
Subject: Re: [PATCH v3 0/2] Ajust lockdep static allocations for sparc


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Fri, Nov 18, 2016 at 02:34:07PM -0500, David Miller wrote:
> > From: Babu Moger <babu.moger@...cle.com>
> > Date: Tue, 27 Sep 2016 12:33:26 -0700
> > 
> > > These patches limit the static allocations for lockdep data structures
> > > used for debugging locking correctness. For sparc, all the kernel's code,
> > > data, and bss, must have locked translations in the TLB so that we don't
> > > get TLB misses on kernel code and data. Current sparc chips have 8 TLB
> > > entries available that may be locked down, and with a 4mb page size,
> > > this gives a maximum of 32MB. With PROVE_LOCKING we could go over this
> > > limit and cause system boot-up problems. These patches limit the static
> > > allocations so that everything fits in current required size limit.
> > > 
> > > patch 1 : Adds new config parameter CONFIG_PROVE_LOCKING_SMALL
> > > Patch 2 : Adjusts the sizes based on the new config parameter
> > > 
> > > v2-> v3:
> > >    Some more comments from Sam Ravnborg and Peter Zijlstra.
> > >    Defined PROVE_LOCKING_SMALL as invisible and moved the selection to
> > >    arch/sparc/Kconfig. 
> > > 
> > > v1-> v2:
> > >    As suggested by Peter Zijlstra, keeping the default as is.
> > >    Introduced new config variable CONFIG_PROVE_LOCKING_SMALL
> > >    to handle sparc specific case.
> > > 
> > > v0:
> > >    Initial revision.
> > 
> > Series applied, thanks.
> 
> Heh, I was only waiting for an ACK from you, but this works too :-)

Works for me too - as usual davem is fantastic in terms of efficient patch flow :)

Thanks,

	Ingo