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Date: Fri, 24 Apr 2026 06:59:22 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Sunny Patel <nueralspacetech@gmail.com>
Cc: David Hildenbrand <david@kernel.org>, Zi Yan <ziy@nvidia.com>, Matthew
 Brost <matthew.brost@intel.com>, Joshua Hahn <joshua.hahnjy@gmail.com>,
 Rakie Kim <rakie.kim@sk.com>, Byungchul Park <byungchul@sk.com>, Gregory
 Price <gourry@gourry.net>, Ying Huang <ying.huang@linux.alibaba.com>,
 Alistair Popple <apopple@nvidia.com>, linux-mm@kvack.org,
 linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] mm/migrate_device: Cleanup up PMD Checks and
 warnings
Message-Id: <20260424065922.5f15ca8c88eaf8a02847af17@linux-foundation.org>
In-Reply-To: <20260419174747.10701-1-nueralspacetech@gmail.com>
References: <20260419174747.10701-1-nueralspacetech@gmail.com>
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On Sun, 19 Apr 2026 23:17:43 +0530 Sunny Patel <nueralspacetech@gmail.com> wrote:

> Remove the odd VM_WARN_ON_FOLIO(!folio, folio) usage and replace it
> with a simpler VM_WARN_ON_ONCE(!folio) check.
> 
> Drop the redundant VM_WARN_ON_ONCE(!pmd_none(*pmdp) &&
> !is_huge_zero_pmd(*pmdp)).
> 
> Refactor the PMD checks, making the control flow
> clearer and avoiding duplicate condition checks.

AI review might have found a bug in the surrounding code:
	https://sashiko.dev/#/patchset/20260419174747.10701-1-nueralspacetech@gmail.com