From a9df9338c1a32e7cdc8c6c6fa7c73f0a63a1ca56 Mon Sep 17 00:00:00 2001 From: Max Filippov Date: Mon, 2 Nov 2015 17:51:02 +0300 Subject: [PATCH] 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 --- arch/xtensa/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 3d35867c61f1..82044f732323 100644 --- 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"