linux-kernel - Re: [PATCH v3 1/2] config: Adding the new config parameter CONFIG_PROVE_LOCKING

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Date:   Wed, 28 Sep 2016 10:39:26 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Babu Moger <babu.moger@...cle.com>
Cc:     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, David Miller <davem@...emloft.net>
Subject: Re: [PATCH v3 1/2] config: Adding the new config parameter
 CONFIG_PROVE_LOCKING_SMALL for sparc

On Tue, Sep 27, 2016 at 12:33:27PM -0700, Babu Moger wrote:
> This new config parameter limits the space used for "Lock debugging:
> prove locking correctness" by about 4MB. The current sparc systems have
> the limitation of 32MB size for kernel size including .text, .data and
> .bss sections. With PROVE_LOCKING feature, the kernel size could grow
> beyond this limit and causing system boot-up issues. With this option,
> kernel limits the size of the entries of lock_chains, stack_trace etc.,
> so that kernel fits in required size limit. This is not visible to user
> and only used for sparc.
> 
> Signed-off-by: Babu Moger <babu.moger@...cle.com>

You forgot to Cc Dave, and since you're touching sparc I need an Ack
from him before I can queue this.

Dave?

> ---
>  arch/sparc/Kconfig |    1 +
>  lib/Kconfig.debug  |    3 +++
>  2 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> index 59b0960..8da321c 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -44,6 +44,7 @@ config SPARC
>  	select ARCH_HAS_SG_CHAIN
>  	select CPU_NO_EFFICIENT_FFS
>  	select HAVE_ARCH_HARDENED_USERCOPY
> +	select PROVE_LOCKING_SMALL if PROVE_LOCKING
>  
>  config SPARC32
>  	def_bool !64BIT
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index cab7405..597e589 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1084,6 +1084,9 @@ config PROVE_LOCKING
>  
>  	 For more details, see Documentation/locking/lockdep-design.txt.
>  
> +config PROVE_LOCKING_SMALL
> +	bool
> +
>  config LOCKDEP
>  	bool
>  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
> -- 
> 1.7.1
>