linux-kernel - Re: [PATCH v5 2/8] mm: pagewalk: Take the pagetable lock in walk_pte

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Message-ID: <20191011125652.2b7ptnyeeso4qwwj@box>
Date:   Fri, 11 Oct 2019 15:56:52 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Thomas Hellström (VMware) 
        <thomas_os@...pmail.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        torvalds@...ux-foundation.org,
        Thomas Hellstrom <thellstrom@...are.com>,
        Matthew Wilcox <willy@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...riel.com>,
        Minchan Kim <minchan@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Huang Ying <ying.huang@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>
Subject: Re: [PATCH v5 2/8] mm: pagewalk: Take the pagetable lock in
 walk_pte_range()

On Thu, Oct 10, 2019 at 02:43:08PM +0200, Thomas Hellström (VMware) wrote:
> From: Thomas Hellstrom <thellstrom@...are.com>
> 
> Without the lock, anybody modifying a pte from within this function might
> have it concurrently modified by someone else.
> 
> Cc: Matthew Wilcox <willy@...radead.org>
> Cc: Will Deacon <will.deacon@....com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Rik van Riel <riel@...riel.com>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Huang Ying <ying.huang@...el.com>
> Cc: Jérôme Glisse <jglisse@...hat.com>
> Cc: Kirill A. Shutemov <kirill@...temov.name>
> Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov