linux-kernel - Re: [PATCH] x86, cpu hotplug, Fix stack frame warning in check_irq_vectors_for_cpu

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Message-ID: <alpine.DEB.2.02.1401301504380.12223@chino.kir.corp.google.com>
Date:	Thu, 30 Jan 2014 15:05:23 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Prarit Bhargava <prarit@...hat.com>
cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Michel Lespinasse <walken@...gle.com>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Yang Zhang <yang.z.zhang@...el.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Janet Morgan <janet.morgan@...el.com>,
	Tony Luck <tony.luck@...el.com>,
	Ruiv Wang <ruiv.wang@...il.com>,
	Gong Chen <gong.chen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>, x86@...nel.org,
	Fengguang Wu <fengguang.wu@...el.com>, yinghai@...nel.org,
	tglx@...utronix.de, mingo@...e.hu, hpa@...or.com
Subject: Re: [PATCH] x86, cpu hotplug, Fix stack frame warning in
 check_irq_vectors_for_cpu_disable()

On Tue, 28 Jan 2014, Prarit Bhargava wrote:

> Further discussion here: http://marc.info/?l=linux-kernel&m=139073901101034&w=2
> 
> kbuild, 0day kernel build service, outputs the warning:
> 
> arch/x86/kernel/irq.c:333:1: warning: the frame size of 2056 bytes
> is larger than 2048 bytes [-Wframe-larger-than=]
> 
> because check_irq_vectors_for_cpu_disable() allocates two cpumasks on the
> stack.   Fix this by moving the two cpumasks to a global file context.
> 
> Signed-off-by: Prarit Bhargava <prarit@...hat.com>

Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Tested-by: David Rientjes <rientjes@...gle.com>
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