linux-kernel - Re: [PATCH V2] mm: Remove unnecessary __GFP_HIGHMEM in __p*d_alloc_one

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Message-ID: <aRDKXmwJeosbvU6N@fedora>
Date: Sun, 9 Nov 2025 09:07:42 -0800
From: "Vishal Moola (Oracle)" <vishal.moola@...il.com>
To: Huacai Chen <chenhuacai@...ngson.cn>
Cc: Huacai Chen <chenhuacai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Kevin Brodsky <kevin.brodsky@....com>, Jan Kara <jack@...e.cz>,
	linux-mm@...ck.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] mm: Remove unnecessary __GFP_HIGHMEM in
 __p*d_alloc_one_*()

On Sun, Nov 09, 2025 at 10:18:17AM +0800, Huacai Chen wrote:
> __{pgd,p4d,pud,pmd,pte}_alloc_one_*() always allocate pages with GFP
> flag GFP_PGTABLE_KERNEL/GFP_PGTABLE_USER. These two macros are defined
> as follows:
> 
>  #define GFP_PGTABLE_KERNEL	(GFP_KERNEL | __GFP_ZERO)
>  #define GFP_PGTABLE_USER	(GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
> 
> There is no __GFP_HIGHMEM in them, so we needn't to clear __GFP_HIGHMEM
> explicitly.
> 
> Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>

Reviewed-by: Vishal Moola (Oracle) <vishal.moola@...il.com>