linux-kernel - Re: [PATCH] Revert "hugetlb: make hugetlb depends on SYSFS or SYSCTL"

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Message-ID: <0138514f-c580-c066-c16d-2a0b207e0604@huawei.com>
Date: Thu, 28 Aug 2025 10:31:51 +0800
From: Miaohe Lin <linmiaohe@...wei.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: <muchun.song@...ux.dev>, <osalvador@...e.de>, <david@...hat.com>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "hugetlb: make hugetlb depends on SYSFS or SYSCTL"

On 2025/8/27 11:35, Andrew Morton wrote:
> On Tue, 26 Aug 2025 11:09:55 +0800 Miaohe Lin <linmiaohe@...wei.com> wrote:
> 
>> Commit f8142cf94d47 ("hugetlb: make hugetlb depends on SYSFS or SYSCTL")
>> added dependency on SYSFS or SYSCTL but hugetlb can be used without SYSFS
>> or SYSCTL. So this dependency is wrong and should be removed.
>>
>> This reverts commit f8142cf94d4737ea0c3baffb3b9bad8addcb9b6b.
> 
> f8142cf94d47 said:
> 
>     If CONFIG_SYSFS and CONFIG_SYSCTL are both undefined, hugetlb
>     doesn't work now as there's no way to set max huge pages.  Make
>     sure at least one of the above configs is defined to make hugetlb
>     works as expected.
> 
> So there is now a way to set max huge pages?  A reference tot he
> commit which made f8142cf94d47 unneeded might be helpful?

The commit is just wrong. It overlooked the scenario of using hugetlb through boot parameters
when it was submitted.

Thanks.
.