linux-kernel - Re: [rfc][patch] remove nopage

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Message-ID: <4737B4AD.9070809@pobox.com>
Date:	Sun, 11 Nov 2007 21:04:29 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Nick Piggin <npiggin@...e.de>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Hugh Dickins <hugh@...itas.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ia64@...r.kernel.org, rth@...ddle.net,
	Jaya Kumar <jayakumar.lkml@...il.com>, krh@...hat.com,
	stefanr@...6.in-berlin.de, rolandd@...co.com,
	mshefty@...ips.intel.com, hal.rosenstock@...il.com,
	avi@...ranet.com, mchehab@...radead.org, dgilbert@...erlog.com,
	Greg Kroah-Hartman <greg@...ah.com>,
	Takashi Iwai <tiwai@...e.de>, perex@...ex.cz,
	Karsten Wiese <annabellesgarden@...oo.de>
Subject: Re: [rfc][patch] remove nopage

Nick Piggin wrote:
> Index: linux-2.6/sound/oss/via82cxxx_audio.c
> ===================================================================
> --- linux-2.6.orig/sound/oss/via82cxxx_audio.c
> +++ linux-2.6/sound/oss/via82cxxx_audio.c
> @@ -2099,8 +2099,7 @@ static void via_dsp_cleanup (struct via_
>  }
>  
>  
> -static struct page * via_mm_nopage (struct vm_area_struct * vma,
> -				    unsigned long address, int *type)
> +static int via_mm_fault (struct vm_area_struct *vma, struct vm_fault *vmf)
>  {
>  	struct via_info *card = vma->vm_private_data;
>  	struct via_channel *chan = &card->ch_out;
> @@ -2108,22 +2107,14 @@ static struct page * via_mm_nopage (stru
>  	unsigned long pgoff;
>  	int rd, wr;
>  
> -	DPRINTK ("ENTER, start %lXh, ofs %lXh, pgoff %ld, addr %lXh\n",
> -		 vma->vm_start,
> -		 address - vma->vm_start,
> -		 (address - vma->vm_start) >> PAGE_SHIFT,
> -		 address);
> -
> -        if (address > vma->vm_end) {
> -		DPRINTK ("EXIT, returning NOPAGE_SIGBUS\n");
> -		return NOPAGE_SIGBUS; /* Disallow mremap */
> -	}
> +	DPRINTK ("ENTER, pgoff %ld\n", vmf->pgoff);
> +
>          if (!card) {
> -		DPRINTK ("EXIT, returning NOPAGE_SIGBUS\n");
> -		return NOPAGE_SIGBUS;	/* Nothing allocated */
> +		DPRINTK ("EXIT, returning VM_FAULT_SIGBUS\n");
> +		return VM_FAULT_SIGBUS;	/* Nothing allocated */
>  	}
>  
> -	pgoff = vma->vm_pgoff + ((address - vma->vm_start) >> PAGE_SHIFT);
> +	pgoff = vmf->pgoff;
>  	rd = card->ch_in.is_mapped;
>  	wr = card->ch_out.is_mapped;
>  
> @@ -2150,9 +2141,8 @@ static struct page * via_mm_nopage (stru
>  	DPRINTK ("EXIT, returning page %p for cpuaddr %lXh\n",
>  		 dmapage, (unsigned long) chan->pgtbl[pgoff].cpuaddr);
>  	get_page (dmapage);
> -	if (type)
> -		*type = VM_FAULT_MINOR;
> -	return dmapage;
> +	vmf->page = dmapage;
> +	return 0;
>  }


Although the overall concept looks nice (ACK, good work), the above 
change does not build.  The code continues to reference via_mm_nopage(), 
which has been renamed to via_mm_fault() in your patch.

	Jeff


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