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

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Message-Id: <20161118.143407.750907377181864816.davem@davemloft.net>
Date:   Fri, 18 Nov 2016 14:34:07 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     babu.moger@...cle.com
Cc:     peterz@...radead.org, 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

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.