linux-kernel - Re: [PATCH 11/12] mm: Remove pXX

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Message-ID: <ZvalJ9O/SV9Riiws@li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com>
Date: Fri, 27 Sep 2024 14:29:27 +0200
From: Alexander Gordeev <agordeev@...ux.ibm.com>
To: Alistair Popple <apopple@...dia.com>
Cc: dan.j.williams@...el.com, linux-mm@...ck.org, vishal.l.verma@...el.com,
        dave.jiang@...el.com, logang@...tatee.com, bhelgaas@...gle.com,
        jack@...e.cz, jgg@...pe.ca, catalin.marinas@....com, will@...nel.org,
        mpe@...erman.id.au, npiggin@...il.com, dave.hansen@...ux.intel.com,
        ira.weiny@...el.com, willy@...radead.org, djwong@...nel.org,
        tytso@....edu, linmiaohe@...wei.com, david@...hat.com,
        peterx@...hat.com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, nvdimm@...ts.linux.dev,
        linux-cxl@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        jhubbard@...dia.com, hch@....de, david@...morbit.com
Subject: Re: [PATCH 11/12] mm: Remove pXX_devmap callers

On Tue, Sep 10, 2024 at 02:14:36PM +1000, Alistair Popple wrote:

Hi Alistair,

> diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
> index 5a4a753..4537a29 100644
> --- a/arch/powerpc/mm/book3s64/pgtable.c
> +++ b/arch/powerpc/mm/book3s64/pgtable.c
> @@ -193,7 +192,7 @@ pmd_t pmdp_huge_get_and_clear_full(struct vm_area_struct *vma,
>  	pmd_t pmd;
>  	VM_BUG_ON(addr & ~HPAGE_PMD_MASK);
>  	VM_BUG_ON((pmd_present(*pmdp) && !pmd_trans_huge(*pmdp) &&
> -		   !pmd_devmap(*pmdp)) || !pmd_present(*pmdp));
> +		   || !pmd_present(*pmdp));

That looks broken.

>  	pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp);
>  	/*
>  	 * if it not a fullmm flush, then we can possibly end up converting

Thanks!