diff options
Diffstat (limited to 'arch/arm/mm/Kconfig')
| -rw-r--r-- | arch/arm/mm/Kconfig | 23 |
1 files changed, 0 insertions, 23 deletions
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index 122d88e073d6..88633fe01a5d 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -864,29 +864,6 @@ config ARM_L1_CACHE_SHIFT default 6 if ARM_L1_CACHE_SHIFT_6 default 5 -config ARM_ATTRIB_ALLOCATOR - bool "Support custom cache attribute allocations in low memory" - select ARCH_LOWMEM_IN_PTES if (CPU_V7) - depends on MMU && !CPU_CACHE_VIVT - help - Historically, the kernel has only reserved a small region - of physical memory for uncached access, and relied on - explicit cache maintenance for ensuring coherency between - the CPU and DMA. - - However, many recent systems support mapping discontiguous - physical pages into contiguous DMA addresses (so-called - system MMUs). For some DMA clients (notably graphics and - multimedia engines), performing explict cache maintenance - between CPU and DMA mappings can be prohibitively expensive, - and since ARMv7, mapping the same physical page with different - cache attributes is disallowed and has unpredictable behavior. - - Say 'Y' here to include page allocation support with explicit - cache attributes; on ARMv7 systems this will also force the - kernel's page tables to be mapped using page tables rather - than sections. - config ARM_DMA_MEM_BUFFERABLE bool "Use non-cacheable memory for DMA" if (CPU_V6 || CPU_V6K) && !CPU_V7 depends on !(MACH_REALVIEW_PB1176 || REALVIEW_EB_ARM11MP || \ |