linux-kernel - Re: kismet: WARNING: unmet direct dependencies detected for HUGETLBFS when selected by PPC

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Message-ID: <d6c06a9c-4d43-4528-c5d1-019f91087f30@huawei.com>
Date: Thu, 6 Feb 2025 15:12:28 +0800
From: Miaohe Lin <linmiaohe@...wei.com>
To: Christophe Leroy <christophe.leroy@...roup.eu>
CC: Paul Gazzillo <paul@...zz.com>, Necip Fazil Yildiran
	<fazilyildiran@...il.com>, <oe-kbuild-all@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>, kernel test
 robot <lkp@...el.com>
Subject: Re: kismet: WARNING: unmet direct dependencies detected for HUGETLBFS
 when selected by PPC_8xx

On 2025/2/6 14:30, Christophe Leroy wrote:
> 
> 
> Le 06/02/2025 à 03:08, Miaohe Lin a écrit :
>> On 2025/2/6 0:35, Christophe Leroy wrote:
>>>
>>>
>>> Le 05/02/2025 à 03:39, Miaohe Lin a écrit :
>>>> On 2025/1/24 6:24, kernel test robot wrote:
>>>>> tree:   https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftorvalds%2Flinux.git&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C97f4bcfeef7147c5a46408dd465329e6%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638744045189449604%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=x37VZjFG%2BB1zYyoDGgz4jIyUbSWx%2FCklH%2FgsDLGCW%2F4%3D&reserved=0 master
>>>>> head:   d0d106a2bd21499901299160744e5fe9f4c83ddb
>>>>> commit: f8142cf94d4737ea0c3baffb3b9bad8addcb9b6b hugetlb: make hugetlb depends on SYSFS or SYSCTL
>>>>> date:   2 years, 4 months ago
>>>>> config: powerpc-kismet-CONFIG_HUGETLBFS-CONFIG_PPC_8xx-0-0 (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.01.org%2F0day-ci%2Farchive%2F20250124%2F202501240611.LDmD2nkj-lkp%40intel.com%2Fconfig&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C97f4bcfeef7147c5a46408dd465329e6%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638744045189465052%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=QSCbgVZFsu%2BQN1b7xDiPsikJR93kWobuPsa%2BtqG3dZA%3D&reserved=0)
>>>>> reproduce: (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.01.org%2F0day-ci%2Farchive%2F20250124%2F202501240611.LDmD2nkj-lkp%40intel.com%2Freproduce&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C97f4bcfeef7147c5a46408dd465329e6%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638744045189472672%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=nT4smogT5pTgqIh7%2FCPD%2FpQsCqaBrxfN%2BtEER7l%2FyLY%3D&reserved=0)
>>>>>
>>>>> If you fix the issue in a separate patch/commit (i.e. not just a new version of
>>>>> the same patch/commit), kindly add following tags
>>>>> | Reported-by: kernel test robot <lkp@...el.com>
>>>>> | Closes: https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Foe-kbuild-all%2F202501240611.LDmD2nkj-lkp%40intel.com%2F&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7C97f4bcfeef7147c5a46408dd465329e6%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C638744045189480482%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=7yBcNLgmgW6BUZ55nHh%2F8fZqHGShaqGDKdotvIQ2Tl8%3D&reserved=0
>>>>
>>>> Thanks for report. Sorry for late respond. I was on my Spring Festival vacation.
>>>>
>>>>>
>>>>> kismet warnings: (new ones prefixed by >>)
>>>>>>> kismet: WARNING: unmet direct dependencies detected for HUGETLBFS when selected by PPC_8xx
>>>>>      WARNING: unmet direct dependencies detected for HUGETLBFS
>>>>>        Depends on [n]: (X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS [=y] || BROKEN [=n]) && (SYSFS [=n] || SYSCTL [=n])
>>>>>        Selected by [y]:
>>>>>        - PPC_8xx [=y] && <choice>
>>>>
>>>> I am a bit confused. HUGETLBFS depends on SYSFS or SYSCTL. How can it be selected while SYSFS [=n] || SYSCTL [=n]?
>>>> Or am I miss something?
>>>
>>> CONFIG_HUGETLBFS is selected by CONFIG_PPC_8xx, see commit 34536d780683 ("powerpc/8xx: Add a function to early map kernel via huge pages")
>>
>> Thanks for your providing. But I'm saying that since HUGETLBFS depends on (SYSFS or SYSCTL), how CONFIG_PPC_8xx succeeds to select it while
>> SYSFS and SYSCTL are disabled? I'm not really familiar with Kconfig but I assume Kconfig will confirm that the dependencies are satisfied
>> before HUGETLBFS is enabled. Or am I miss something?
> 
> I suggest you read https://docs.kernel.org/kbuild/kconfig-language.html

Thanks.

> 
> Extract:
> 
> Note:
>     select should be used with care. select will force a symbol to a value without visiting the dependencies. By abusing select you are able to select a symbol FOO even if FOO depends on BAR that is not set.

IMHO, it seems it's the use of "select" breaks the dependencies and leads to the kismet warnings. So it might be better to fix the PPC_8xx side.

Thanks.
.