linux-kernel - Re: [PATCH v5 06/13] lockdep: Implement crossrelease feature

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Message-ID: <20170301104548.GE6515@twins.programming.kicks-ass.net>
Date:   Wed, 1 Mar 2017 11:45:48 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     mingo@...nel.org, tglx@...utronix.de, walken@...gle.com,
        boqun.feng@...il.com, kirill@...temov.name,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org,
        npiggin@...il.com, kernel-team@....com
Subject: Re: [PATCH v5 06/13] lockdep: Implement crossrelease feature

On Wed, Mar 01, 2017 at 01:40:33PM +0900, Byungchul Park wrote:

> Right. I decided to force MAX_XHLOCKS_NR to be power of 2 and everything
> became easy. Thank you very much.

Something like:

	BUILD_BUG_ON(MAX_XHLOCKS_NR & (MAX_XHLOCK_NR - 1));

Should enforce I think.