linux-kernel - Re: [PATCH v3 07/10] perf/hisi_pcie: Avoid placing cpumask on the stack

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Date: Fri, 5 Apr 2024 10:54:22 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Dawei Li <dawei.li@...ngroup.cn>
CC: <will@...nel.org>, <mark.rutland@....com>, <yury.norov@...il.com>,
	<linux@...musvillemoes.dk>, <xueshuai@...ux.alibaba.com>,
	<renyu.zj@...ux.alibaba.com>, <yangyicong@...ilicon.com>,
	<andersson@...nel.org>, <konrad.dybcio@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v3 07/10] perf/hisi_pcie: Avoid placing cpumask on the
 stack

On Wed, 3 Apr 2024 23:59:47 +0800
Dawei Li <dawei.li@...ngroup.cn> wrote:

> In general it's preferable to avoid placing cpumasks on the stack, as
> for large values of NR_CPUS these can consume significant amounts of
> stack space and make stack overflows more likely.
> 
> Use cpumask_any_and_but() to avoid the need for a temporary cpumask on
> the stack.
> 
> Suggested-by: Mark Rutland <mark.rutland@....com>
> Reviewed-by: Mark Rutland <mark.rutland@....com>
> Signed-off-by: Dawei Li <dawei.li@...ngroup.cn>
Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>