linux-kernel - Re: [PATCH 1/2] huge_mm.h: is_huge_zero

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Message-ID: <CAKPOu+_8_gfko=Sh-YKpbgcMy0aJB=m9yrC5JJKEZm=yeYPOgA@mail.gmail.com>
Date: Wed, 27 Aug 2025 12:13:34 +0200
From: Max Kellermann <max.kellermann@...os.com>
To: David Hildenbrand <david@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, lorenzo.stoakes@...cle.com, ziy@...dia.com, 
	baolin.wang@...ux.alibaba.com, Liam.Howlett@...cle.com, npache@...hat.com, 
	ryan.roberts@....com, dev.jain@....com, baohua@...nel.org, 
	shikemeng@...weicloud.com, kasong@...cent.com, nphamcs@...il.com, 
	bhe@...hat.com, chrisl@...nel.org, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] huge_mm.h: is_huge_zero_folio(NULL) should return false

On Wed, Aug 27, 2025 at 11:36 AM David Hildenbrand <david@...hat.com> wrote:
> Why should it be allowed to pass in garbage (folio == NULL) into a
> function that operates on valid folios?

This patch isn't about the function parameter but about the global
variable being NULL.
(Don't mix up with my other patch.)