linux-kernel - Re: [PATCH v2] mm/rmap: Add anon

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Message-ID: <c5a52f8c-5819-4eca-be4d-9c534c6ad6bd@redhat.com>
Date: Fri, 25 Jul 2025 17:40:09 +0200
From: David Hildenbrand <david@...hat.com>
To: Jann Horn <jannh@...gle.com>, Vlastimil Babka <vbabka@...e.cz>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Rik van Riel
 <riel@...riel.com>, "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Harry Yoo <harry.yoo@...cle.com>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm/rmap: Add anon_vma lifetime debug check

>>> +      */
>>> +     if (folio_test_anon(folio) && !folio_test_ksm(folio)) {
>>
>> So you verified this compiles out completely without DEBUG_VM?
> 
> No, after David's suggestion to remove the explicit CONFIG_DEBUG_VM
> check, I looked at the definitions of these things to check that it's
> all just plain reads and arithmetic, and removed the CONFIG_DEBUG_VM
> check, but haven't actually compile-tested it.

The compiler seems to know its judo well.

-- 
Cheers,

David / dhildenb