linux-kernel - Re: [PATCH] mm/pgtable: convert pgtable

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Message-ID: <1d110134-89ab-474b-bca6-cfbfd4b5057f@gmail.com>
Date: Thu, 8 Jan 2026 10:23:19 +0800
From: Alex Shi <seakeel@...il.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Mike Rapoport <rppt@...nel.org>, alexs@...nel.org,
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Subject: Re: [PATCH] mm/pgtable: convert pgtable_t to ptdesc pointer



On 2026/1/7 22:48, Matthew Wilcox wrote:
> On Wed, Jan 07, 2026 at 05:28:36PM +0800, Alex Shi wrote:
>> Right, I will fix this. and sent the 2nd version.
> No, the patch is stupid and wrong.  Don't send a v2.  You seem to have a
> hairtrigger resend, so I'm trying to prevent a v2 being sent instead of
> sending a patient reply.

Hi Matthew,

I hear you—no v2 will be sent.
but sorry for a bit confusing, what's your expected fix? is the too 
quick resenting? or the direction to alignment pgtable_t with ptdesc is 
wrong?

If it's the first. the new change for review address Mike's concern.
diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h
index a17f01235c29..a204c3ac800a 100644
--- a/arch/arm/include/asm/pgalloc.h
+++ b/arch/arm/include/asm/pgalloc.h
@@ -94,13 +94,13 @@ pte_alloc_one_kernel(struct mm_struct *mm)
  static inline pgtable_t
  pte_alloc_one(struct mm_struct *mm)
  {
-       struct page *pte;
+       struct ptdesc *pte;

         pte = __pte_alloc_one(mm, GFP_PGTABLE_USER | PGTABLE_HIGHMEM);
         if (!pte)
                 return NULL;
-       if (!PageHighMem(pte))
-               clean_pte_table(page_address(pte));
+       if (!PageHighMem(ptdesc_page(pte)))
+               clean_pte_table(ptdesc_address(pte));
         return pte;
  }

@@ -141,7 +141,7 @@ pmd_populate(struct mm_struct *mm, pmd_t *pmdp, 
pgtable_t ptep)
         else
                 prot = _PAGE_USER_TABLE;

-       __pmd_populate(pmdp, page_to_phys(ptep), prot);
+       __pmd_populate(pmdp, page_to_phys(ptdesc_page(ptep)), prot);
  }

  #endif /* CONFIG_MMU */