linux-kernel - Re: [4/6] go BUG on vmallocspace in _

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Date:	Wed, 02 May 2007 15:31:03 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	William Lee Irwin III <wli@...omorphy.com>
CC:	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	David Chinner <dgc@....com>, Zan Lynx <zlynx@....org>,
	Adrian Bunk <bunk@...sta.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [4/6] go BUG on vmallocspace in __pa()

William Lee Irwin III wrote:
>  
> +unsigned long __kvaddr_to_paddr(unsigned long kvaddr)
> +{
> +	if (high_memory)
> +		BUG_ON(kvaddr >= VMALLOC_START);
> +	else
> +		BUG_ON(kvaddr >= (unsigned long)__va(MAXMEM));
> +	return kvaddr - PAGE_OFFSET;
> +}
>   

Needs to be exported so that modules can use __pa.  Though I suspect
most modules doing so are buggy:

WARNING: "__kvaddr_to_paddr" [sound/pci/snd-intel8x0.ko] undefined!
WARNING: "__kvaddr_to_paddr" [sound/core/snd-pcm.ko] undefined!
WARNING: "__kvaddr_to_paddr" [sound/core/snd-page-alloc.ko] undefined!
WARNING: "__kvaddr_to_paddr" [net/ieee80211/ieee80211_crypt_wep.ko] undefined!
WARNING: "__kvaddr_to_paddr" [fs/xfs/xfs.ko] undefined!
WARNING: "__kvaddr_to_paddr" [fs/nfsd/nfsd.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/usb/misc/usbtest.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/scsi/sg.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/parport/parport_pc.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/net/e1000/e1000.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/mmc/mmc_core.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/mmc/mmc_block.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/kvm/kvm.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/kvm/kvm-intel.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/ieee1394/sbp2.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/ieee1394/ohci1394.ko] undefined!
WARNING: "__kvaddr_to_paddr" [drivers/char/drm/drm.ko] undefined!

    J
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