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[142.68.57.212]) by smtp.gmail.com with ESMTPSA id t55sm30553520qte.24.2020.03.13.05.22.10 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 13 Mar 2020 05:22:10 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1jCjKM-0001tj-5O; Fri, 13 Mar 2020 09:22:10 -0300 Date: Fri, 13 Mar 2020 09:22:10 -0300 From: Jason Gunthorpe To: Souptick Joarder Cc: jglisse@redhat.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/hmm.c : Remove additional check for lockdep_assert_held() Message-ID: <20200313122210.GB31668@ziepe.ca> References: <1584065460-22205-1-git-send-email-jrdr.linux@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1584065460-22205-1-git-send-email-jrdr.linux@gmail.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Mar 13, 2020 at 07:41:00AM +0530, Souptick Joarder wrote: > walk_page_range() already has a check for lockdep_assert_held(). > So additional check for lockdep_assert_held() can be removed from > hmm_range_fault(). Is there a reason why you think this redundancy is bad? IMHO it makes it easier to understand the API contract if key top level APIs have their assumptions coded in lockdep. Jason