linux-kernel - Re: [PATCH 06/10] mm/mremap: check remap conditions earlier

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Message-ID: <061bfccf-6828-424c-8fca-2498c48c97e7@suse.cz>
Date: Thu, 10 Jul 2025 16:36:42 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: Peter Xu <peterx@...hat.com>, Alexander Viro <viro@...iv.linux.org.uk>,
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
 "Liam R . Howlett" <Liam.Howlett@...cle.com>, Jann Horn <jannh@...gle.com>,
 Pedro Falcato <pfalcato@...e.de>, Rik van Riel <riel@...riel.com>,
 linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 06/10] mm/mremap: check remap conditions earlier

On 7/7/25 07:27, Lorenzo Stoakes wrote:
> When we expand or move a VMA, this requires a number of additional checks
> to be performed.
> 
> Make it really obvious under what circumstances these checks must be
> performed and aggregate all the checks in one place by invoking this in
> check_prep_vma().
> 
> We have to adjust the checks to account for shrink + move operations by
> checking new_len <= old_len rather than new_len == old_len.
> 
> No functional change intended.
> 
> Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>

Reviewed-by: Vlastimil Babka <vbabka@...e.cz>