linux-kernel - Re: [Bug 7505] Linux-2.6.18 fails to boot on AMD64 machine

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Date:	Fri, 29 Dec 2006 11:18:23 +0100
From:	Stefano Takekawa <take@...ero.it>
To:	Andrew Morton <akpm@...l.org>
Cc:	Ard -kwaak- van Breemen <ard@...egraafnet.nl>,
	Greg KH <greg@...ah.com>,
	"Zhang, Yanmin" <yanmin.zhang@...el.com>,
	Chuck Ebbert <76306.1226@...puserve.com>,
	Yinghai Lu <yinghai.lu@....com>, agalanin@...a.ru,
	linux-kernel@...r.kernel.org, bugme-daemon@...zilla.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [Bug 7505] Linux-2.6.18 fails to boot on AMD64 machine

Il giorno gio, 28/12/2006 alle 15.51 -0800, Andrew Morton ha scritto:
> Could someone please test this?
> diff -puN drivers/pci/search.c~pci-avoid-taking-pci_bus_sem-early-in-boot drivers/pci/search.c
> --- a/drivers/pci/search.c~pci-avoid-taking-pci_bus_sem-early-in-boot
> +++ a/drivers/pci/search.c
> @@ -259,6 +259,16 @@ pci_get_subsys(unsigned int vendor, unsi
>  	struct pci_dev *dev;
>  
>  	WARN_ON(in_interrupt());
> +
> +	/*
> +	 * pci_get_subsys() can be called on the ide_setup() path, super-early
> +	 * in boot.  But the down_read() will enable local interrupts, which
> +	 * can cause some machines to crash.  So here we detect that situation
> +	 * and bail out early.
> +	 */
> +	if (unlikely(list_empty(pci_devices)))
> +		return NULL;
> +
>  	down_read(&pci_bus_sem);
>  	n = from ? from->global_list.next : pci_devices.next;
>  
> _
> 
Applied to 2.6.19 it returns error while compiling:

CC      drivers/pci/search.o
drivers/pci/search.c: In function ‘pci_get_subsys’:
drivers/pci/search.c:269: error: incompatible type for argument 1 of
‘list_empty’
make[2]: *** [drivers/pci/search.o] Error 1
make[1]: *** [drivers/pci] Error 2
make: *** [drivers] Error 2

drivers/pci/search.c
268       */
269        if (unlikely(list_empty(pci_devices)))
270               return NULL;


-- 
Stefano Takekawa
take@...ero.it

Frank:  And why do days get longer in the summer?
Ernest: Because heat makes things expand!


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