linux-kernel - Re: [PATCH] mm/hmm.c : Remove additional check for lockdep_assert

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Message-ID: <20200313122210.GB31668@ziepe.ca>
Date:   Fri, 13 Mar 2020 09:22:10 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     jglisse@...hat.com, akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/hmm.c : Remove additional check for
 lockdep_assert_held()

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