linux-kernel - Re: [PATCH v4] mm: mmap: map MAP_STACK to VM

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Message-ID: <4610064f-04f0-47c5-aff9-2584958f71fb@redhat.com>
Date: Wed, 7 May 2025 15:18:13 +0200
From: David Hildenbrand <david@...hat.com>
To: Ignacio.MorenoGonzalez@...a.com, lorenzo.stoakes@...cle.com
Cc: Liam.Howlett@...cle.com, akpm@...ux-foundation.org,
 yang@...amperecomputing.com, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v4] mm: mmap: map MAP_STACK to VM_NOHUGEPAGE only if THP
 is enabled

On 07.05.25 15:13, Ignacio Moreno Gonzalez via B4 Relay wrote:
> From: Ignacio Moreno Gonzalez <Ignacio.MorenoGonzalez@...a.com>
> 
> commit c4608d1bf7c6 ("mm: mmap: map MAP_STACK to VM_NOHUGEPAGE") maps
> the mmap option MAP_STACK to VM_NOHUGEPAGE. This is also done if
> CONFIG_TRANSPARENT_HUGETABLES is not defined. But in that case, the
> VM_NOHUGEPAGE does not make sense.
> 
> I discovered this issue when trying to use the tool CRIU to checkpoint
> and restore a container. Our running kernel is compiled without
> CONFIG_TRANSPARENT_HUGETABLES.

Like very kernel out there, because this config option does not exist.

:)

You only fixed it in the comment below the ---

-- 
Cheers,

David / dhildenb