linux-kernel - Re: [RFC v10 PATCH 3/3] mm: unmap VM_PFNMAP mappings with optimized path

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Message-ID: <20180915094515.GC31572@bombadil.infradead.org>
Date:   Sat, 15 Sep 2018 02:45:15 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     mhocko@...nel.org, ldufour@...ux.vnet.ibm.com, vbabka@...e.cz,
        kirill@...temov.name, akpm@...ux-foundation.org,
        dave.hansen@...el.com, oleg@...hat.com, srikar@...ux.vnet.ibm.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v10 PATCH 3/3] mm: unmap VM_PFNMAP mappings with optimized
 path

On Sat, Sep 15, 2018 at 04:34:59AM +0800, Yang Shi wrote:
> When unmapping VM_PFNMAP mappings, vm flags need to be updated. Since
> the vmas have been detached, so it sounds safe to update vm flags with
> read mmap_sem.
> 
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Signed-off-by: Yang Shi <yang.shi@...ux.alibaba.com>

Reviewed-by: Matthew Wilcox <willy@...radead.org>