linux-kernel - Re: [PATCH] x86: Add check for number of available vectors before CPU down [v2]

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Message-ID: <CA+8MBbKHZ0i0mEYLUrmWwaofvnRcxc7Dvm+w0CfZf2uQydjdjQ@mail.gmail.com>
Date:	Wed, 18 Dec 2013 11:50:45 -0800
From:	Tony Luck <tony.luck@...el.com>
To:	Prarit Bhargava <prarit@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, X86-ML <x86@...nel.org>,
	Michel Lespinasse <walken@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Yang Zhang <yang.z.zhang@...el.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	janet.morgan@...el.com, "Yu, Fenghua" <fenghua.yu@...el.com>
Subject: Re: [PATCH] x86: Add check for number of available vectors before CPU
 down [v2]

On Wed, Dec 18, 2013 at 11:29 AM, Prarit Bhargava <prarit@...hat.com> wrote:
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=64791
>
> When a cpu is downed on a system, the irqs on the cpu are assigned to other cpus.  It is possible, however, that when a cpu is downed there aren't enough free vectors on the remaining cpus to account for the vectors from the cpu that is being downed.
>
> This results in an interesting "overflow" condition where irqs are "assigned" to a CPU but are not handled.

Looks good to me.

Acked-by: Tony Luck <tony.luck@...el.com>
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