linux-kernel - Re: [PATCH 10/10] hugetlb: make hugetlb selects SYSFS if !SYSCTL

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Message-Id: <1BAFF85D-F7F5-4DD1-ABEF-2FF621DE34E8@linux.dev>
Date:   Sat, 27 Aug 2022 09:59:09 +0800
From:   Muchun Song <muchun.song@...ux.dev>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/10] hugetlb: make hugetlb selects SYSFS if !SYSCTL



> On Aug 26, 2022, at 17:24, Miaohe Lin <linmiaohe@...wei.com> wrote:
> 
> 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.

Right. I think the majority of the people are usually use /proc knob to
reserve HugeTLB pages than /sys fs. So I suggest to add a “depends on SYSCTL”
item. What’s your thoughts?

Thanks.

> 
> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
> fs/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
> 
> diff --git a/fs/Kconfig b/fs/Kconfig
> index a547307c1ae8..b266e7b5de85 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -235,6 +235,7 @@ config ARCH_SUPPORTS_HUGETLBFS
> config HUGETLBFS
> 	bool "HugeTLB file system support"
> 	depends on X86 || IA64 || SPARC64 || ARCH_SUPPORTS_HUGETLBFS || BROKEN
> +	select SYSFS if !SYSCTL
> 	help
> 	  hugetlbfs is a filesystem backing for HugeTLB pages, based on
> 	  ramfs. For architectures that support it, say Y here and read
> -- 
> 2.23.0
> 
>