Merge branch 'master' into for-3.9-async

To receive f56c319 ("async: fix
__lowest_in_progress()").

Signed-off-by: Tejun Heo <[email protected]>

Documentation/ABI/stable/sysfs-devices-node

@@ -1,7 +1,101 @@
+What:		/sys/devices/system/node/possible
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		Nodes that could be possibly become online at some point.
+
+What:		/sys/devices/system/node/online
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		Nodes that are online.
+
+What:		/sys/devices/system/node/has_normal_memory
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		Nodes that have regular memory.
+
+What:		/sys/devices/system/node/has_cpu
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		Nodes that have one or more CPUs.
+
+What:		/sys/devices/system/node/has_high_memory
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		Nodes that have regular or high memory.
+		Depends on CONFIG_HIGHMEM.
+
 What:		/sys/devices/system/node/nodeX
 Date:		October 2002
 Contact:	Linux Memory Management list <[email protected]>
 Description:
 		When CONFIG_NUMA is enabled, this is a directory containing
 		information on node X such as what CPUs are local to the
-		node.
+		node. Each file is detailed next.
+
+What:		/sys/devices/system/node/nodeX/cpumap
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		The node's cpumap.
+
+What:		/sys/devices/system/node/nodeX/cpulist
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		The CPUs associated to the node.
+
+What:		/sys/devices/system/node/nodeX/meminfo
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		Provides information about the node's distribution and memory
+		utilization. Similar to /proc/meminfo, see Documentation/filesystems/proc.txt
+
+What:		/sys/devices/system/node/nodeX/numastat
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		The node's hit/miss statistics, in units of pages.
+		See Documentation/numastat.txt
+
+What:		/sys/devices/system/node/nodeX/distance
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		Distance between the node and all the other nodes
+		in the system.
+
+What:		/sys/devices/system/node/nodeX/vmstat
+Date:		October 2002
+Contact:	Linux Memory Management list <[email protected]>
+Description:
+		The node's zoned virtual memory statistics.
+		This is a superset of numastat.
+
+What:		/sys/devices/system/node/nodeX/compact
+Date:		February 2010
+Contact:	Mel Gorman <[email protected]>
+Description:
+		When this file is written to, all memory within that node
+		will be compacted. When it completes, memory will be freed
+		into blocks which have as many contiguous pages as possible
+
+What:		/sys/devices/system/node/nodeX/scan_unevictable_pages
+Date:		October 2008
+Contact:	Lee Schermerhorn <[email protected]>
+Description:
+		When set, it triggers scanning the node's unevictable lists
+		and move any pages that have become evictable onto the respective
+		zone's inactive list. See mm/vmscan.c
+
+What:		/sys/devices/system/node/nodeX/hugepages/hugepages-<size>/
+Date:		December 2009
+Contact:	Lee Schermerhorn <[email protected]>
+Description:
+		The node's huge page size control/query attributes.
+		See Documentation/vm/hugetlbpage.txt

Documentation/ABI/testing/ima_policy

@@ -23,7 +23,7 @@ Description:
 			lsm:	[[subj_user=] [subj_role=] [subj_type=]
 				 [obj_user=] [obj_role=] [obj_type=]]
 
-		base: 	func:= [BPRM_CHECK][FILE_MMAP][FILE_CHECK]
+		base: 	func:= [BPRM_CHECK][FILE_MMAP][FILE_CHECK][MODULE_CHECK]
 			mask:= [MAY_READ] [MAY_WRITE] [MAY_APPEND] [MAY_EXEC]
 			fsmagic:= hex value
 			uid:= decimal value
@@ -53,6 +53,7 @@ Description:
 			measure func=BPRM_CHECK
 			measure func=FILE_MMAP mask=MAY_EXEC
 			measure func=FILE_CHECK mask=MAY_READ uid=0
+			measure func=MODULE_CHECK uid=0
 			appraise fowner=0
 
 		The default policy measures all executables in bprm_check,

Documentation/ABI/testing/sysfs-bus-rbd

@@ -70,6 +70,10 @@ snap_*
 
 	A directory per each snapshot
 
+parent
+
+	Information identifying the pool, image, and snapshot id for
+	the parent image in a layered rbd image (format 2 only).
 
 Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name>
 -------------------------------------------------------------

Documentation/DMA-API-HOWTO.txt

@@ -468,11 +468,46 @@ To map a single region, you do:
 	size_t size = buffer->len;
 
 	dma_handle = dma_map_single(dev, addr, size, direction);
+	if (dma_mapping_error(dma_handle)) {
+		/*
+		 * reduce current DMA mapping usage,
+		 * delay and try again later or
+		 * reset driver.
+		 */
+		goto map_error_handling;
+	}
 
 and to unmap it:
 
 	dma_unmap_single(dev, dma_handle, size, direction);
 
+You should call dma_mapping_error() as dma_map_single() could fail and return
+error. Not all dma implementations support dma_mapping_error() interface.
+However, it is a good practice to call dma_mapping_error() interface, which
+will invoke the generic mapping error check interface. Doing so will ensure
+that the mapping code will work correctly on all dma implementations without
+any dependency on the specifics of the underlying implementation. Using the
+returned address without checking for errors could result in failures ranging
+from panics to silent data corruption. Couple of example of incorrect ways to
+check for errors that make assumptions about the underlying dma implementation
+are as follows and these are applicable to dma_map_page() as well.
+
+Incorrect example 1:
+	dma_addr_t dma_handle;
+
+	dma_handle = dma_map_single(dev, addr, size, direction);
+	if ((dma_handle & 0xffff != 0) || (dma_handle >= 0x1000000)) {
+		goto map_error;
+	}
+
+Incorrect example 2:
+	dma_addr_t dma_handle;
+
+	dma_handle = dma_map_single(dev, addr, size, direction);
+	if (dma_handle == DMA_ERROR_CODE) {
+		goto map_error;
+	}
+
 You should call dma_unmap_single when the DMA activity is finished, e.g.
 from the interrupt which told you that the DMA transfer is done.
 
@@ -489,13 +524,27 @@ Specifically:
 	size_t size = buffer->len;
 
 	dma_handle = dma_map_page(dev, page, offset, size, direction);
+	if (dma_mapping_error(dma_handle)) {
+		/*
+		 * reduce current DMA mapping usage,
+		 * delay and try again later or
+		 * reset driver.
+		 */
+		goto map_error_handling;
+	}
 
 	...
 
 	dma_unmap_page(dev, dma_handle, size, direction);
 
 Here, "offset" means byte offset within the given page.
 
+You should call dma_mapping_error() as dma_map_page() could fail and return
+error as outlined under the dma_map_single() discussion.
+
+You should call dma_unmap_page when the DMA activity is finished, e.g.
+from the interrupt which told you that the DMA transfer is done.
+
 With scatterlists, you map a region gathered from several regions by:
 
 	int i, count = dma_map_sg(dev, sglist, nents, direction);
@@ -578,6 +627,14 @@ to use the dma_sync_*() interfaces.
 		dma_addr_t mapping;
 
 		mapping = dma_map_single(cp->dev, buffer, len, DMA_FROM_DEVICE);
+		if (dma_mapping_error(dma_handle)) {
+			/*
+			 * reduce current DMA mapping usage,
+			 * delay and try again later or
+			 * reset driver.
+			 */
+			goto map_error_handling;
+		}
 
 		cp->rx_buf = buffer;
 		cp->rx_len = len;
@@ -658,6 +715,75 @@ failure can be determined by:
 		 * delay and try again later or
 		 * reset driver.
 		 */
+		goto map_error_handling;
+	}
+
+- unmap pages that are already mapped, when mapping error occurs in the middle
+  of a multiple page mapping attempt. These example are applicable to
+  dma_map_page() as well.
+
+Example 1:
+	dma_addr_t dma_handle1;
+	dma_addr_t dma_handle2;
+
+	dma_handle1 = dma_map_single(dev, addr, size, direction);
+	if (dma_mapping_error(dev, dma_handle1)) {
+		/*
+		 * reduce current DMA mapping usage,
+		 * delay and try again later or
+		 * reset driver.
+		 */
+		goto map_error_handling1;
+	}
+	dma_handle2 = dma_map_single(dev, addr, size, direction);
+	if (dma_mapping_error(dev, dma_handle2)) {
+		/*
+		 * reduce current DMA mapping usage,
+		 * delay and try again later or
+		 * reset driver.
+		 */
+		goto map_error_handling2;
+	}
+
+	...
+
+	map_error_handling2:
+		dma_unmap_single(dma_handle1);
+	map_error_handling1:
+
+Example 2: (if buffers are allocated a loop, unmap all mapped buffers when
+	    mapping error is detected in the middle)
+
+	dma_addr_t dma_addr;
+	dma_addr_t array[DMA_BUFFERS];
+	int save_index = 0;
+
+	for (i = 0; i < DMA_BUFFERS; i++) {
+
+		...
+
+		dma_addr = dma_map_single(dev, addr, size, direction);
+		if (dma_mapping_error(dev, dma_addr)) {
+			/*
+			 * reduce current DMA mapping usage,
+			 * delay and try again later or
+			 * reset driver.
+			 */
+			goto map_error_handling;
+		}
+		array[i].dma_addr = dma_addr;
+		save_index++;
+	}
+
+	...
+
+	map_error_handling:
+
+	for (i = 0; i < save_index; i++) {
+
+		...
+
+		dma_unmap_single(array[i].dma_addr);
 	}
 
 Networking drivers must call dev_kfree_skb to free the socket buffer

Documentation/DMA-API.txt

@@ -678,3 +678,15 @@ out of dma_debug_entries. These entries are preallocated at boot. The number
 of preallocated entries is defined per architecture. If it is too low for you
 boot with 'dma_debug_entries=<your_desired_number>' to overwrite the
 architectural default.
+
+void debug_dmap_mapping_error(struct device *dev, dma_addr_t dma_addr);
+
+dma-debug interface debug_dma_mapping_error() to debug drivers that fail
+to check dma mapping errors on addresses returned by dma_map_single() and
+dma_map_page() interfaces. This interface clears a flag set by
+debug_dma_map_page() to indicate that dma_mapping_error() has been called by
+the driver. When driver does unmap, debug_dma_unmap() checks the flag and if
+this flag is still set, prints warning message that includes call trace that
+leads up to the unmap. This interface can be called from dma_mapping_error()
+routines to enable dma mapping error check debugging.
+

Documentation/DocBook/media/v4l/driver.xml

@@ -116,15 +116,15 @@ my_suspend              (struct pci_dev *               pci_dev,
 	return 0; /* a negative value on error, 0 on success. */
 }
 
-static void __devexit
+static void
 my_remove               (struct pci_dev *               pci_dev)
 {
 	my_device *my = pci_get_drvdata (pci_dev);
 
 	/* Describe me. */
 }
 
-static int __devinit
+static int
 my_probe                (struct pci_dev *               pci_dev,
 			 const struct pci_device_id *   pci_id)
 {
@@ -157,7 +157,7 @@ my_pci_driver = {
 	.id_table = my_pci_device_ids,
 
 	.probe    = my_probe,
-	.remove   = __devexit_p (my_remove),
+	.remove   = my_remove,
 
 	/* Power management functions. */
 	.suspend  = my_suspend,

Documentation/PCI/pci-iov-howto.txt

@@ -76,7 +76,7 @@ To notify SR-IOV core of Virtual Function Migration:
 
 Following piece of code illustrates the usage of the SR-IOV API.
 
-static int __devinit dev_probe(struct pci_dev *dev, const struct pci_device_id *id)
+static int dev_probe(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	pci_enable_sriov(dev, NR_VIRTFN);
 
@@ -85,7 +85,7 @@ static int __devinit dev_probe(struct pci_dev *dev, const struct pci_device_id *
 	return 0;
 }
 
-static void __devexit dev_remove(struct pci_dev *dev)
+static void dev_remove(struct pci_dev *dev)
 {
 	pci_disable_sriov(dev);
 
@@ -131,7 +131,7 @@ static struct pci_driver dev_driver = {
 	.name =		"SR-IOV Physical Function driver",
 	.id_table =	dev_id_table,
 	.probe =	dev_probe,
-	.remove =	__devexit_p(dev_remove),
+	.remove =	dev_remove,
 	.suspend =	dev_suspend,
 	.resume =	dev_resume,
 	.shutdown =	dev_shutdown,