linux-kernel - Re: [PATCH v2] pci: fix unavailable irq number 255 reported by BIOS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.11.1601270933560.3886@nanos>
Date:	Wed, 27 Jan 2016 09:35:22 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Cao jin <caoj.fnst@...fujitsu.com>
cc:	Bjorn Helgaas <helgaas@...nel.org>,
	Chen Fan <chen.fan.fnst@...fujitsu.com>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	rjw@...ysocki.net, lenb@...nel.org, izumi.taku@...fujitsu.com,
	wency@...fujitsu.com, ddaney.cavm@...il.com, okaya@...eaurora.org,
	bhelgaas@...gle.com, jiang.liu@...ux.intel.com,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v2] pci: fix unavailable irq number 255 reported by
 BIOS

On Wed, 27 Jan 2016, Cao jin wrote:
> How about using IRQ_BITMAP_BITS as that "irq_valid" flag? because it is the
> ceiling of struct irq_desc irq_desc[], and request_irq() will return -EINVAL
> in case of the ceiling.
> 
> #ifdef CONFIG_SPARSE_IRQ
> # define IRQ_BITMAP_BITS	(NR_IRQS + 8196)
> #else
> # define IRQ_BITMAP_BITS	NR_IRQS
> #endif

No. This is a core internal implementation detail.

Thanks,

	tglx