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Date: Wed, 9 May 2018 12:05:51 +0200
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 6/7] psi: pressure stall information for CPU, memory, and
 IO
Message-ID: <20180509100551.GL12217@hirez.programming.kicks-ass.net>
References: <20180507210135.1823-1-hannes@cmpxchg.org>
 <20180507210135.1823-7-hannes@cmpxchg.org>
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In-Reply-To: <20180507210135.1823-7-hannes@cmpxchg.org>
Sender: owner-linux-mm@kvack.org
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To: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org, cgroups@vger.kernel.org, Ingo Molnar <mingo@redhat.com>, Andrew Morton <akpm@linuxfoundation.org>, Tejun Heo <tj@kernel.org>, Balbir Singh <bsingharora@gmail.com>, Mike Galbraith <efault@gmx.de>, Oliver Yang <yangoliver@me.com>, Shakeel Butt <shakeelb@google.com>, xxx xxx <x.qendo@gmail.com>, Taras Kondratiuk <takondra@cisco.com>, Daniel Walker <danielwa@cisco.com>, Vinayak Menon <vinmenon@codeaurora.org>, Ruslan Ruslichenko <rruslich@cisco.com>, kernel-team@fb.com

On Mon, May 07, 2018 at 05:01:34PM -0400, Johannes Weiner wrote:
> +	u64 some[NR_PSI_RESOURCES] = { 0, };
> +	u64 full[NR_PSI_RESOURCES] = { 0, };

> +		some[r] /= max(nonidle_total, 1UL);
> +		full[r] /= max(nonidle_total, 1UL);

That's a bare 64bit divide.. that typically failed to build on 32bit
archs.