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

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Date:   Wed, 1 Mar 2017 21:10:58 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     Peter Zijlstra <peterz@...radead.org>
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 11:45:48AM +0100, Peter Zijlstra wrote:
> 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.

Good idea! Thank you very much.