linux-kernel - Re: [PATCH v2 1/2] config: Add new CONFIG_PROVE_LOCKING

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Date:   Tue, 27 Sep 2016 11:26:27 -0500
From:   Babu Moger <babu.moger@...cle.com>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
        akpm@...ux-foundation.org, keescook@...omium.org,
        dan.j.williams@...el.com, aryabinin@...tuozzo.com, tj@...nel.org,
        linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH v2 1/2] config: Add new CONFIG_PROVE_LOCKING_SMALL



On 9/27/2016 10:43 AM, Sam Ravnborg wrote:
> On Tue, Sep 27, 2016 at 09:51:40AM -0500, Babu Moger wrote:
>> On 9/27/2016 6:40 AM, Peter Zijlstra wrote:
>>> On Tue, Sep 27, 2016 at 06:46:25AM +0200, Sam Ravnborg wrote:
>>>> Since this is only relevant for sparc, and for sparc this is "select"ed,
>>>> then there is limited/no gain having this as a visible menu config option.
>>>>
>>>> How about adding just a simple non-visible config symbol:
>>>>
>>>> config PROVE_LOCKING_SMALL
>>>> 	bool
>>>>
>>>> The nice help text can be added to the H file, and the select
>>>> can be move to the sparc/Kconfig file where it really belongs.
>>> Yes, this should not be user selectable. I don't mind the help being
>>> here though.
>>   How about this?
>>   Moved everything to arch/sparc/Kconfig.debug. It may be not useful
>> to have help in
>> config file as it is not visible. Lets have some explanation in .h file.
>> I will send v3 version if you all agree.
>> =====================================
>> diff --git a/arch/sparc/Kconfig.debug b/arch/sparc/Kconfig.debug
>> index 6db35fb..67e58a1 100644
>> --- a/arch/sparc/Kconfig.debug
>> +++ b/arch/sparc/Kconfig.debug
>> @@ -21,4 +21,9 @@ config FRAME_POINTER
>>          depends on MCOUNT
>>          default y
>>
>> +config PROVE_LOCKING_SMALL
>> +       bool
>> +       depends on PROVE_LOCKING && SPARC
>> +       default y
>> +
>>   endmenu
> The idea is to have the SPAC specific stuff in arch/sparc/Kconfig,
> and not scattered in Kconfig files all over the tree.
>
> Therefore drop the "depends".
>
> In sparc/Kconfig you then just do:
>
> config SPARC
> 	select PROVE_LOCKING_SMALL if PROVE_LOCKING
>
> The if part is likely not needed as PROVE_LOCKING_SMALL will be ignored
> unless PROVE_LOCKING is enabled.
  Sure. thanks.  Here it is below. I will re-post v3.


diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index cde1a62..353731f 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -43,6 +43,7 @@ config SPARC
         select ODD_RT_SIGACTION
         select OLD_SIGSUSPEND
         select ARCH_HAS_SG_CHAIN
+       select PROVE_LOCKING_SMALL if PROVE_LOCKING

  config SPARC32
         def_bool !64BIT
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index ba2b0c8..3ba1665 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1008,6 +1008,9 @@ 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




> 	Sam