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linux/arch/arm64/mm
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Marek Szyprowski a92a43a16c arm64: dma-mapping: always clear allocated buffers 
commit 6829e274a6 upstream.

Buffers allocated by dma_alloc_coherent() are always zeroed on Alpha,
ARM (32bit), MIPS, PowerPC, x86/x86_64 and probably other architectures.
It turned out that some drivers rely on this 'feature'. Allocated buffer
might be also exposed to userspace with dma_mmap() call, so clearing it
is desired from security point of view to avoid exposing random memory
to userspace. This patch unifies dma_alloc_coherent() behavior on ARM64
architecture with other implementations by unconditionally zeroing
allocated buffer.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
[ luis: backported to 3.16:
  - dropped changes to __alloc_from_pool() which doesn't exist in 3.16 ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
History 2015-05-12 09:36:36 +01:00
..
cache.S arm64: mm: use inner-shareable barriers for inner-shareable maintenance 2014-05-09 17:21:24 +01:00
context.c arm64: Process management 2012-09-17 13:41:58 +01:00
copypage.c arm64: export __cpu_{clear,copy}_user_page functions 2014-07-08 17:30:51 +01:00
dma-mapping.c arm64: dma-mapping: always clear allocated buffers 2015-05-12 09:36:36 +01:00
extable.c arm64: MMU fault handling and page table management 2012-09-17 13:41:57 +01:00
fault.c Revert "arm64: Introduce execute-only page access permissions" 2014-05-16 16:44:32 +01:00
flush.c arm64: mm: Make icache synchronisation logic huge page aware 2014-07-04 14:26:01 +01:00
hugetlbpage.c hugetlb: restrict hugepage_migration_support() to x86_64 2014-06-04 16:53:51 -07:00
init.c arm64: Create non-empty ZONE_DMA when DRAM starts above 4GB 2014-07-23 11:23:58 +01:00
ioremap.c arm64: add early_ioremap support 2014-04-07 16:36:15 -07:00
Makefile arm64: mm: Optimise tlb flush logic where we have >4K granule 2014-05-09 17:00:48 +01:00
mm.h arm64: Remove __flush_dcache_page() 2013-06-07 17:58:30 +01:00
mmap.c mm: remove free_area_cache 2013-07-10 18:11:34 -07:00
mmu.c - Optimised assembly string/memory routines (based on the AArch64 Cortex 2014-06-06 10:43:28 -07:00
pgd.c arm64: simplify pgd_alloc 2014-02-05 10:45:07 +00:00
proc-macros.S arm64: mm: use ubfm for dcache_line_size 2014-01-22 16:23:58 +00:00
proc.S arm64: mm: use inner-shareable barriers for inner-shareable maintenance 2014-05-09 17:21:24 +01:00