linux-kernel - Re: [RFC PATCH v3 2/3] mm: Add PUD level pagetable account

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Message-ID: <YsERO3OpZSJuC4hW@casper.infradead.org>
Date:   Sun, 3 Jul 2022 04:47:07 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc:     akpm@...ux-foundation.org, rppt@...ux.ibm.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>, loongarch@...ts.linux.dev
Subject: Re: [RFC PATCH v3 2/3] mm: Add PUD level pagetable account

On Thu, Jun 30, 2022 at 07:11:15PM +0800, Baolin Wang wrote:
> +++ b/arch/loongarch/include/asm/pgalloc.h
> @@ -89,10 +89,15 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
>  static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address)
>  {
>  	pud_t *pud;
> +	struct page *page;
>  
> -	pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_ORDER);
> -	if (pud)
> -		pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table);
> +	page = alloc_pages(GFP_KERNEL, PUD_ORDER);

Argh.  I just got rid of PMD_ORDER from PA-RISC.  Now Loongstupid has
reintroduced it, and worse introduced PUD_ORDER.  See commit
7bf82eb3873f.