diff options
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index ae55c1e04d1..e742d06285b 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -263,8 +263,14 @@ config ZONE_DMA_FLAG default "1" config BOUNCE - def_bool y + bool "Enable bounce buffers" + default y depends on BLOCK && MMU && (ZONE_DMA || HIGHMEM) + help + Enable bounce buffers for devices that cannot access + the full range of memory available to the CPU. Enabled + by default when ZONE_DMA or HIGHMEM is selected, but you + may say n to override this. # On the 'tile' arch, USB OHCI needs the bounce pool since tilegx will often # have more than 4GB of memory, but we don't currently use the IOTLB to present @@ -286,8 +292,12 @@ config NR_QUICK default "1" config VIRT_TO_BUS - def_bool y - depends on HAVE_VIRT_TO_BUS + bool + help + An architecture should select this if it implements the + deprecated interface virt_to_bus(). All new architectures + should probably not select this. + config MMU_NOTIFIER bool |