linux-kernel - Re: [PATCH v5 03/13] mm/shmem: Support memfile

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Date:   Mon, 11 Apr 2022 18:26:47 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Chao Peng <chao.p.peng@...ux.intel.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-api@...r.kernel.org, qemu-devel@...gnu.org,
        Wanpeng Li <wanpengli@...cent.com>, jun.nakajima@...el.com,
        david@...hat.com, "J . Bruce Fields" <bfields@...ldses.org>,
        dave.hansen@...el.com, "H . Peter Anvin" <hpa@...or.com>,
        ak@...ux.intel.com, Jonathan Corbet <corbet@....net>,
        Joerg Roedel <joro@...tes.org>, x86@...nel.org,
        Hugh Dickins <hughd@...gle.com>,
        Steven Price <steven.price@....com>,
        Ingo Molnar <mingo@...hat.com>,
        "Maciej S . Szmigiero" <mail@...iej.szmigiero.name>,
        Borislav Petkov <bp@...en8.de>, luto@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Jim Mattson <jmattson@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Jeff Layton <jlayton@...nel.org>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Mike Rapoport <rppt@...nel.org>
Subject: Re: [PATCH v5 03/13] mm/shmem: Support memfile_notifier

On Thu, Mar 10, 2022 at 10:09:01PM +0800, Chao Peng wrote:
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 9b31a7056009..7b43e274c9a2 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -903,6 +903,28 @@ static struct folio *shmem_get_partial_folio(struct inode *inode, pgoff_t index)
>  	return page ? page_folio(page) : NULL;
>  }
>  
> +static void notify_fallocate(struct inode *inode, pgoff_t start, pgoff_t end)
> +{
> +#ifdef CONFIG_MEMFILE_NOTIFIER
> +	struct shmem_inode_info *info = SHMEM_I(inode);
> +
> +	memfile_notifier_fallocate(&info->memfile_notifiers, start, end);
> +#endif

All these #ifdefs look ugly. Could you provide dummy memfile_* for
!MEMFILE_NOTIFIER case?

-- 
 Kirill A. Shutemov