Dan Williams 0abdd7a81b dma-debug: introduce debug_dma_assert_idle() ... Record actively mapped pages and provide an api for asserting a given page is dma inactive before execution proceeds. Placing debug_dma_assert_idle() in cow_user_page() flagged the violation of the dma-api in the NET_DMA implementation (see commit 7787380336 "net_dma: mark broken"). The implementation includes the capability to count, in a limited way, repeat mappings of the same page that occur without an intervening unmap. This 'overlap' counter is limited to the few bits of tag space in a radix tree. This mechanism is added to mitigate false negative cases where, for example, a page is dma mapped twice and debug_dma_assert_idle() is called after the page is un-mapped once. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Vinod Koul <vinod.koul@intel.com> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Cc: James Bottomley <JBottomley@Parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-01-21 16:19:41 -08:00
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acpi	Merge branches 'acpi-pci-pm' and 'acpi-pci-hotplug'	2013-12-31 22:03:37 +01:00
asm-generic	Linux 3.13-rc8	2014-01-13 11:44:41 +01:00
clocksource
crypto	crypto: scatterwalk - Use sg_chain_ptr on chain entries	2013-12-09 19:58:52 +08:00
drm	drm/radeon: 0x9649 is SUMO2 not SUMO	2013-12-23 10:03:41 -05:00
dt-bindings
keys
kvm
linux	dma-debug: introduce debug_dma_assert_idle()	2014-01-21 16:19:41 -08:00
math-emu
media	[media] videobuf2: Add support for file access mode flags for DMABUF exporting	2013-12-09 14:50:50 -02:00
memory
misc
net	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-01-20 10:42:08 -08:00
pcmcia
ras
rdma	IB/core: const'ify inbuf in struct ib_udata	2013-12-16 10:38:28 -08:00
rxrpc
scsi
sound	Merge remote-tracking branch 'asoc/topic/compress' into asoc-next	2014-01-20 11:50:41 +00:00
target	target/file: Update hw_max_sectors based on current block_size	2013-12-19 00:18:54 -08:00
trace	* Add the functionality to override error reporting agents as some	2013-12-16 14:33:17 +01:00
uapi	sound updates for 3.14-rc1	2014-01-21 10:26:23 -08:00
video
xen	Nobody has been maintaining xen in ia64 for a long time.	2014-01-20 09:33:40 -08:00
Kbuild