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From: npiggin@suse.de
To: akpm@linux-foundation.org
Cc: perex@perex.cz, tiwai@suse.de, alsa-devel@alsa-project.org,
	linux-kernel@vger.kernel.org
Subject: [patch 13/18] alsa: nopage
Date: Wed, 05 Dec 2007 18:16:00 +1100	[thread overview]
Message-ID: <20071205071628.115327000@nick.local0.net> (raw)
In-Reply-To: 20071205071547.701344000@nick.local0.net

[-- Attachment #1: alsa-nopage.patch --]
[-- Type: text/plain, Size: 4171 bytes --]

Convert ALSA from nopage to fault.
Switch from OOM to SIGBUS if the resource is not available.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: perex@perex.cz
Cc: tiwai@suse.de
Cc: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org
---
 sound/core/pcm_native.c |   59 ++++++++++++++++++++----------------------------
 1 file changed, 25 insertions(+), 34 deletions(-)

Index: linux-2.6/sound/core/pcm_native.c
===================================================================
--- linux-2.6.orig/sound/core/pcm_native.c
+++ linux-2.6/sound/core/pcm_native.c
@@ -3018,26 +3018,23 @@ static unsigned int snd_pcm_capture_poll
 /*
  * mmap status record
  */
-static struct page * snd_pcm_mmap_status_nopage(struct vm_area_struct *area,
-						unsigned long address, int *type)
+static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
+						struct vm_fault *vmf)
 {
 	struct snd_pcm_substream *substream = area->vm_private_data;
 	struct snd_pcm_runtime *runtime;
-	struct page * page;
 	
 	if (substream == NULL)
-		return NOPAGE_SIGBUS;
+		return VM_FAULT_SIGBUS;
 	runtime = substream->runtime;
-	page = virt_to_page(runtime->status);
-	get_page(page);
-	if (type)
-		*type = VM_FAULT_MINOR;
-	return page;
+	vmf->page = virt_to_page(runtime->status);
+	get_page(vmf->page);
+	return 0;
 }
 
 static struct vm_operations_struct snd_pcm_vm_ops_status =
 {
-	.nopage =	snd_pcm_mmap_status_nopage,
+	.fault =	snd_pcm_mmap_status_fault,
 };
 
 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
@@ -3061,26 +3058,23 @@ static int snd_pcm_mmap_status(struct sn
 /*
  * mmap control record
  */
-static struct page * snd_pcm_mmap_control_nopage(struct vm_area_struct *area,
-						 unsigned long address, int *type)
+static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
+						struct vm_fault *vmf)
 {
 	struct snd_pcm_substream *substream = area->vm_private_data;
 	struct snd_pcm_runtime *runtime;
-	struct page * page;
 	
 	if (substream == NULL)
-		return NOPAGE_SIGBUS;
+		return VM_FAULT_SIGBUS;
 	runtime = substream->runtime;
-	page = virt_to_page(runtime->control);
-	get_page(page);
-	if (type)
-		*type = VM_FAULT_MINOR;
-	return page;
+	vmf->page = virt_to_page(runtime->control);
+	get_page(vmf->page);
+	return 0;
 }
 
 static struct vm_operations_struct snd_pcm_vm_ops_control =
 {
-	.nopage =	snd_pcm_mmap_control_nopage,
+	.fault =	snd_pcm_mmap_control_fault,
 };
 
 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
@@ -3117,10 +3111,10 @@ static int snd_pcm_mmap_control(struct s
 #endif /* coherent mmap */
 
 /*
- * nopage callback for mmapping a RAM page
+ * fault callback for mmapping a RAM page
  */
-static struct page *snd_pcm_mmap_data_nopage(struct vm_area_struct *area,
-					     unsigned long address, int *type)
+static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
+						struct vm_fault *vmf)
 {
 	struct snd_pcm_substream *substream = area->vm_private_data;
 	struct snd_pcm_runtime *runtime;
@@ -3130,33 +3124,30 @@ static struct page *snd_pcm_mmap_data_no
 	size_t dma_bytes;
 	
 	if (substream == NULL)
-		return NOPAGE_SIGBUS;
+		return VM_FAULT_SIGBUS;
 	runtime = substream->runtime;
-	offset = area->vm_pgoff << PAGE_SHIFT;
-	offset += address - area->vm_start;
-	snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_SIGBUS);
+	offset = vmf->pgoff << PAGE_SHIFT;
 	dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
 	if (offset > dma_bytes - PAGE_SIZE)
-		return NOPAGE_SIGBUS;
+		return VM_FAULT_SIGBUS;
 	if (substream->ops->page) {
 		page = substream->ops->page(substream, offset);
-		if (! page)
-			return NOPAGE_OOM; /* XXX: is this really due to OOM? */
+		if (!page)
+			return VM_FAULT_SIGBUS;
 	} else {
 		vaddr = runtime->dma_area + offset;
 		page = virt_to_page(vaddr);
 	}
 	get_page(page);
-	if (type)
-		*type = VM_FAULT_MINOR;
-	return page;
+	vmf->page = page;
+	return 0;
 }
 
 static struct vm_operations_struct snd_pcm_vm_ops_data =
 {
 	.open =		snd_pcm_mmap_data_open,
 	.close =	snd_pcm_mmap_data_close,
-	.nopage =	snd_pcm_mmap_data_nopage,
+	.fault =	snd_pcm_mmap_data_fault,
 };
 
 /*

-- 


  parent reply	other threads:[~2007-12-05  7:57 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-05  7:15 [patch 00/18] remove nopage npiggin
2007-12-05  7:15 ` [patch 01/18] ia64: ia32 nopage npiggin
2007-12-05  7:15 ` [patch 02/18] relay: nopage npiggin
2007-12-05  7:15 ` [patch 03/18] drm: nopage npiggin
2007-12-05  9:05   ` Dave Airlie
2007-12-05  9:17     ` Nick Piggin
2007-12-05  7:15 ` [patch 04/18] uio: nopage npiggin
2007-12-05 10:04   ` Hans-Jürgen Koch
2007-12-05 10:10     ` Nick Piggin
2007-12-05 10:25       ` Hans-Jürgen Koch
2007-12-05 10:37         ` Nick Piggin
2007-12-05  7:15 ` [patch 05/18] kvm: nopage npiggin
2007-12-05 10:40   ` Avi Kivity
2007-12-05  7:15 ` [patch 06/18] ieee1394: nopage npiggin
2007-12-05 13:09   ` Stefan Richter
2007-12-05 13:15     ` Stefan Richter
2007-12-05 23:52       ` Nick Piggin
2007-12-05 23:51     ` Nick Piggin
2007-12-15 13:04       ` Stefan Richter
2007-12-15 13:01   ` Stefan Richter
2007-12-05  7:15 ` [patch 07/18] v4l: nopage npiggin
2007-12-08  0:31   ` Andrew Morton
2007-12-08  9:15     ` Ingo Molnar
2007-12-08 10:15       ` Andrew Morton
2007-12-09 17:10     ` Randy Dunlap
2007-12-10  5:06     ` [patch] x64/page.h: convert some macros to inlines Randy Dunlap
2007-12-10  8:34       ` Ingo Molnar
2007-12-05  7:15 ` [patch 08/18] fb: defio nopage npiggin
2007-12-05  7:15 ` [patch 09/18] agp: alpha nopage npiggin
2007-12-05  7:15 ` [patch 10/18] sg: nopage npiggin
2008-02-08  3:45   ` Douglas Gilbert
2007-12-05  7:15 ` [patch 11/18] ib: nopage npiggin
2007-12-05  7:15 ` [patch 12/18] usb: mon nopage npiggin
2007-12-05 16:39   ` Pete Zaitcev
2007-12-05 23:54     ` Nick Piggin
2007-12-05  7:16 ` npiggin [this message]
2007-12-13 15:35   ` [patch 13/18] alsa: nopage Takashi Iwai
2007-12-05  7:16 ` [patch 14/18] oss: via nopage npiggin
2007-12-05  7:16 ` [patch 15/18] alsa: usx2y nopage npiggin
2007-12-13 15:35   ` Takashi Iwai
2007-12-05  7:16 ` [patch 16/18] mm: special mapping nopage npiggin
2007-12-05  7:16 ` [patch 17/18] mm: remove nopage npiggin
2007-12-05 22:47   ` Andrew Morton
2007-12-05 23:23     ` Nick Piggin

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