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Konrad Rzeszutek Wilk 63a741757d xen/swiotlb: Use page alignment for early buffer allocation. 
This fixes an odd bug found on a Dell PowerEdge 1850/0RC130
(BIOS A05 01/09/2006) where all of the modules doing pci_set_dma_mask
would fail with:

ata_piix 0000:00:1f.1: enabling device (0005 -> 0007)
ata_piix 0000:00:1f.1: can't derive routing for PCI INT A
ata_piix 0000:00:1f.1: BMDMA: failed to set dma mask, falling back to PIO

The issue was the Xen-SWIOTLB was allocated such as that the end of
buffer was stradling a page (and also above 4GB). The fix was
spotted by Kalev Leonid  which was to piggyback on git commit
e79f86b2ef "swiotlb: Use page alignment
for early buffer allocation" which:

	We could call free_bootmem_late() if swiotlb is not used, and
	it will shrink to page alignment.

	So alloc them with page alignment at first, to avoid lose two pages

And doing that fixes the outstanding issue.

CC: stable@kernel.org
Suggested-by: "Kalev, Leonid" <Leonid.Kalev@ca.com>
Reported-and-Tested-by: "Taylor, Neal E" <Neal.Taylor@ca.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2011-12-15 11:28:46 -05:00
..
xen-pciback xen: Add module.h to modular drivers/xen users. 2011-10-31 19:32:11 -04:00
xenbus xen: map foreign pages for shared rings by updating the PTEs directly 2011-11-16 12:13:08 -05:00
xenfs
balloon.c xen/balloon: Avoid OOM when requesting highmem 2011-11-16 12:13:43 -05:00
biomerge.c
cpu_hotplug.c
events.c Merge branch 'stable/cleanups-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen 2011-11-06 20:13:34 -08:00
evtchn.c
features.c
gntalloc.c xen-gntalloc: signedness bug in add_grefs() 2011-11-16 12:13:48 -05:00
gntdev.c xen-gntdev: integer overflow in gntdev_alloc_map() 2011-11-16 12:13:46 -05:00
grant-table.c Merge branch 'stable/cleanups-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen 2011-11-06 20:13:34 -08:00
Kconfig xen: remove XEN_PLATFORM_PCI config option 2011-09-29 10:52:16 -04:00
Makefile xen: remove XEN_PLATFORM_PCI config option 2011-09-29 10:52:16 -04:00
manage.c xen: Add export.h for THIS_MODULE/EXPORT_SYMBOL to various xen users. 2011-10-31 19:32:11 -04:00
pci.c Merge branch 'stable/cleanups-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen 2011-11-06 20:13:34 -08:00
platform-pci.c
swiotlb-xen.c xen/swiotlb: Use page alignment for early buffer allocation. 2011-12-15 11:28:46 -05:00
sys-hypervisor.c
tmem.c xen: prepare tmem shim to handle frontswap 2011-06-17 15:06:20 -06:00
xen-balloon.c xen: use static initializers in xen-balloon.c 2011-07-29 13:45:45 -04:00
xen-selfballoon.c Merge branches 'stable/bug.fixes-3.2' and 'stable/mmu.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen 2011-10-25 09:17:47 +02:00
xencomm.c