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Wed, 13 Apr 2022 02:34:40 +0000 Received: from SA2PR10MB4569.namprd10.prod.outlook.com ([fe80::5d9c:9b32:8395:1287]) by SA2PR10MB4569.namprd10.prod.outlook.com ([fe80::5d9c:9b32:8395:1287%2]) with mapi id 15.20.5164.018; Wed, 13 Apr 2022 02:34:40 +0000 Message-ID: Date: Tue, 12 Apr 2022 19:34:35 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH RESEND 1/1] lib/Kconfig: remove DEBUG_PER_CPU_MAPS dependency for CPUMASK_OFFSTACK Content-Language: en-US To: Randy Dunlap , gregkh@linuxfoundation.org, masahiroy@kernel.org, tglx@linutronix.de, peterz@infradead.org, mingo@kernel.org, vbabka@suse.cz, akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org References: <20220412231508.32629-1-libo.chen@oracle.com> <20220412231508.32629-2-libo.chen@oracle.com> <157cb46a-d134-2e72-4a65-14e378dd2b8e@oracle.com> <26855467-107d-4ba1-4f32-2afd5918d5b7@infradead.org> From: Libo Chen In-Reply-To: <26855467-107d-4ba1-4f32-2afd5918d5b7@infradead.org> Content-Type: text/plain; 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Even the original patch dating back to 2008, >>>> aab46da0520a ("cpumask: Add CONFIG_CPUMASK_OFFSTACK") didn't give any >>>> rationale for such dependency. >>>> >>>> Nowhere in the code supports the presumption that DEBUG_PER_CPU_MAPS is >>>> necessary for CONFIG_CPUMASK_OFFSTACK. Make no mistake, it's good to >>>> have DEBUG_PER_CPU_MAPS for debugging purpose or precaution, but it's >>>> simply not a hard requirement for CPUMASK_OFFSTACK. Moreover, x86 Kconfig >>>> already can set CPUMASK_OFFSTACK=y without DEBUG_PER_CPU_MAPS=y. >>>> There is no reason other architectures cannot given the fact that they >>>> have even fewer, if any, arch-specific CONFIG_DEBUG_PER_CPU_MAPS code than >>>> x86. >>>> >>>> Signed-off-by: Libo Chen >>>> --- >>>>   lib/Kconfig | 2 +- >>>>   1 file changed, 1 insertion(+), 1 deletion(-) >>>> >>>> diff --git a/lib/Kconfig b/lib/Kconfig >>>> index 087e06b4cdfd..7209039dfb59 100644 >>>> --- a/lib/Kconfig >>>> +++ b/lib/Kconfig >>>> @@ -511,7 +511,7 @@ config CHECK_SIGNATURE >>>>       bool >>>>     config CPUMASK_OFFSTACK >>>> -    bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS >>> This "if" dependency only controls whether the Kconfig symbol's prompt is >>> displayed (presented) in kconfig tools. Removing it makes the prompt always >>> be displayed. >>> >>> Any architecture could select (should be able to) CPUMASK_OFFSTACK independently >>> of DEBUG_PER_CPU_MAPS. >> Do you mean changing arch/xxxx/Kconfig to select CPUMASK_OFFSTACK under some config xxx? That will work but it requires code changes for each architecture. >> But if you are talking about setting CONFIG_CPUMASK_OFFSTACK=y without CONFIG_DEBUG_PER_CPU_MAPS directly in config file, I have tried, it doesn't work. > I'm just talking about the Kconfig change below. Not talking about whatever else > it might require per architecture. > > But you say you have tried that and it doesn't work. What part of it doesn't work? > The Kconfig part or some code execution? oh the Kconfig part. For example, make olddefconfig on a config file with CPUMASK_OFFSTACK=y only turns off CPUMASK_OFFSTACK unless I explicitly set DEBUG_PER_CPU_MAPS=y Libo > I'll test the Kconfig part of it later (in a few hours). > >> Libo >>> Is there another problem here? >>> >>>> +    bool "Force CPU masks off stack" >>>>       help >>>>         Use dynamic allocation for cpumask_var_t, instead of putting >>>>         them on the stack.  This is a bit more expensive, but avoids From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B01C7C433F5 for ; Wed, 13 Apr 2022 02:36:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; 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