linux-kernel - Re: [RFC PATCH] mm: remove zap_page_range and change callers to use zap_vma_page

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Message-ID: <Y6XW3hMtB7PrTSM5@infradead.org>
Date:   Fri, 23 Dec 2022 08:27:10 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        David Hildenbrand <david@...hat.com>,
        Michal Hocko <mhocko@...e.com>, Peter Xu <peterx@...hat.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Will Deacon <will@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Palmer Dabbelt <palmer@...belt.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Christian Brauner <brauner@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH] mm: remove zap_page_range and change callers to use
 zap_vma_page_range

>  		unsigned long size = vma->vm_end - vma->vm_start;
>  
>  		if (vma_is_special_mapping(vma, vdso_info[VDSO_ABI_AA64].dm))
> -			zap_page_range(vma, vma->vm_start, size);
> +			zap_vma_page_range(vma, vma->vm_start, size);
>  #ifdef CONFIG_COMPAT_VDSO
>  		if (vma_is_special_mapping(vma, vdso_info[VDSO_ABI_AA32].dm))
> -			zap_page_range(vma, vma->vm_start, size);
> +			zap_vma_page_range(vma, vma->vm_start, size);
>  #endif

So for something called zap_vma_page_range I'd expect to just pass
the vma and zap all of it, which this and many other callers want
anyway.

> +++ b/arch/s390/mm/gmap.c
> @@ -722,7 +722,7 @@ void gmap_discard(struct gmap *gmap, unsigned long from, unsigned long to)
>  		if (is_vm_hugetlb_page(vma))
>  			continue;
>  		size = min(to - gaddr, PMD_SIZE - (gaddr & ~PMD_MASK));
> -		zap_page_range(vma, vmaddr, size);
> +		zap_vma_page_range(vma, vmaddr, size);

And then just call zap_page_range_single directly for those that
don't want to zap the entire vma.