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xtensa: add FORCE_MAX_ZONEORDER to Kconfig

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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>
This commit is contained in:
Max Filippov 2015-11-02 17:51:02 +03:00
parent 6c33dc33ce
commit a9df9338c1
1 changed files with 14 additions and 0 deletions
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14
arch/xtensa/Kconfig
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@ -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"