linux-kernel - Re: [PATCH v4 01/27] lockdep: Teach lockdep about "USED" <- "IN-NMI" inversions

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Message-ID: <20200221152828.7fe59d51@gandalf.local.home>
Date:   Fri, 21 Feb 2020 15:28:28 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        mingo@...nel.org, joel@...lfernandes.org,
        gregkh@...uxfoundation.org, gustavo@...eddedor.com,
        tglx@...utronix.de, paulmck@...nel.org, josh@...htriplett.org,
        mathieu.desnoyers@...icios.com, jiangshanlai@...il.com,
        luto@...nel.org, tony.luck@...el.com, frederic@...nel.org,
        dan.carpenter@...cle.com, mhiramat@...nel.org
Subject: Re: [PATCH v4 01/27] lockdep: Teach lockdep about "USED" <-
 "IN-NMI" inversions

On Fri, 21 Feb 2020 21:25:11 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> > Nitpick, but the association with bit 16 and this mask really should be
> > defined as a macro somewhere and not have hard coded numbers.  
> 
> Right, I suppose I can do something like:
> 
> #define LOCKDEP_RECURSION_BITS	16
> #define LOCKDEP_OFF (1U << LOCKDEP_RECURSION_BITS)
> #define LOCKDEP_RECURSION_MASK (LOCKDEP_OFF - 1)

LGTM

-- Steve