xtensa: add FORCE_MAX_ZONEORDER to Kconfig

Make maximal memory allocation order configurable, so that drivers could
allocate huge buffers when they need to.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 3d35867..82044f7 100644 (file)
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -398,6 +398,20 @@ config SIMDISK1_FILENAME
 
 source "mm/Kconfig"
 
+config FORCE_MAX_ZONEORDER
+       int "Maximum zone order"
+       default "11"
+       help
+         The kernel memory allocator divides physically contiguous memory
+         blocks into "zones", where each zone is a power of two number of
+         pages.  This option selects the largest power of two that the kernel
+         keeps in the memory allocator.  If you need to allocate very large
+         blocks of physically contiguous memory, then you may need to
+         increase this value.
+
+         This config option is actually maximum order plus one. For example,
+         a value of 11 means that the largest free memory block is 2^10 pages.
+
 source "drivers/pcmcia/Kconfig"
 
 source "drivers/pci/hotplug/Kconfig"