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

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Date:   Sat, 19 Nov 2016 12:53:01 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     David Miller <davem@...emloft.net>
Cc:     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

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 :-)