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Ian Campbell 52ba0746b3 xen/arm: correctly handle DMA mapping of compound pages 
Currently xen_dma_map_page concludes that DMA to anything other than
the head page of a compound page must be foreign, since the PFN of the
page is that of the head.

Fix the check to instead consider the whole of a compound page to be
local if the PFN of the head passes the 1:1 check.

We can never see a compound page which is a mixture of foreign and
local sub-pages.

The comment already correctly described the intention, but fixup the
spelling and some grammar.

This fixes the various SSH protocol errors which we have been seeing
on the cubietrucks in our automated test infrastructure.

This has been broken since commit 3567258d28 ("xen/arm: use
hypercall to flush caches in map_page"), which was in v3.19-rc1.

NB arch/arm64/.../xen/page-coherent.h also includes this file.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: xen-devel@lists.xenproject.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: stable@vger.kernel.org # v3.19+
2016-02-08 17:19:27 +00:00
..
alpha mm: mlock: add mlock flags to enable VM_LOCKONFAULT usage 2015-11-05 19:34:48 -08:00
arc ARC: smp: Rename platform hook @init_cpu_smp -> @init_per_cpu 2015-12-17 12:56:56 +05:30
arm xen/arm: correctly handle DMA mapping of compound pages 2016-02-08 17:19:27 +00:00
arm64 xen/arm: introduce HYPERVISOR_platform_op on arm and arm64 2015-12-21 14:40:56 +00:00
avr32 dmaengine updates for 4.4-rc1 2015-11-10 10:05:17 -08:00
blackfin treewide: Remove old email address 2015-11-23 09:44:58 +01:00
c6x
cris cris: Drop reference to get_cmos_time() 2015-11-02 20:03:05 +01:00
frv kmap_atomic_to_page() has no users, remove it 2015-11-09 15:11:24 -08:00
h8300 h8300 update for v4.4 2015-11-12 15:26:39 -08:00
hexagon
ia64 [IA64] Enable mlock2 syscall for ia64 2015-12-14 10:30:02 -08:00
m32r
m68k m68k: Wire up mlock2 2015-11-22 11:35:26 +01:00
metag Metag architecture changes for v4.4 2015-11-10 16:24:25 -08:00
microblaze Revert "scatterlist: use sg_phys()" 2015-12-15 12:54:06 -08:00
mips MIPS: fix DMA contiguous allocation 2015-12-12 10:15:34 -08:00
mn10300 mn10300: Select CONFIG_HAVE_UID16 to fix build failure 2015-11-30 07:01:40 -08:00
nios2 nios2: fix cache coherency 2015-11-26 22:25:58 +08:00
openrisc
parisc parisc: Disable huge pages on Mako machines 2015-12-12 16:45:23 +01:00
powerpc powerpc/opal-irqchip: Fix deadlock introduced by "Fix double endian conversion" 2015-12-18 22:24:15 +11:00
s390 KVM/ARM Fixes for v4.4-rc3. 2015-11-24 19:34:40 +01:00
score
sh sh64: fix __NR_fgetxattr 2015-12-12 10:15:34 -08:00
sparc treewide: Remove old email address 2015-11-23 09:44:58 +01:00
tile treewide: Remove old email address 2015-11-23 09:44:58 +01:00
um um: fix returns without va_end 2015-12-08 22:26:00 +01:00
unicore32 pwm: Changes for v4.4-rc1 2015-11-11 09:16:10 -08:00
x86 x86/xen: don't reset vcpu_info on a cancelled suspend 2016-01-04 11:49:25 +00:00
xtensa Merge branch 'for-4.4/io-poll' of git://git.kernel.dk/linux-block 2015-11-10 17:23:49 -08:00
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