linux-kernel - Re: [PATCH tip/core/rcu 6/7] mm: Replace spin_is

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Date:   Thu, 15 Nov 2018 10:49:17 -0800
From:   Davidlohr Bueso <dave@...olabs.net>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        Lance Roy <ldr709@...il.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Jan Kara <jack@...e.cz>, Shakeel Butt <shakeelb@...gle.com>,
        linux-mm@...ck.org
Subject: Re: [PATCH tip/core/rcu 6/7] mm: Replace spin_is_locked() with
 lockdep

On Sun, 11 Nov 2018, Paul E. McKenney wrote:

>From: Lance Roy <ldr709@...il.com>
>
>lockdep_assert_held() is better suited to checking locking requirements,
>since it only checks if the current thread holds the lock regardless of
>whether someone else does. This is also a step towards possibly removing
>spin_is_locked().

So fyi I'm not crazy about these kind of patches simply because lockdep
is a lot less used out of anything that's not a lab, and we can be missing
potential offenders. There's obviously nothing wrong about what you describe
above perse, just my two cents.

Thansk,
Davidlohr