From: Dave Kleikamp Date: Fri, 28 Oct 2016 17:12:40 +0000 (-0700) Subject: sparc64: Add FORCE_MAX_ZONEORDER and default to 13 X-Git-Tag: v4.9-rc7~32^2~4^2~5 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c88c545bf3202ca2cdb45df93eb40e3bcdbb3742;p=karo-tx-linux.git sparc64: Add FORCE_MAX_ZONEORDER and default to 13 This change allows ATU (new IOMMU) in SPARC systems to request large (32M) contiguous memory during boot for creating IOTSB backing store. Signed-off-by: Dave Kleikamp Signed-off-by: Tushar Dave Signed-off-by: David S. Miller --- diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index b23c76b42d6e..5202eb4ba2db 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -89,6 +89,10 @@ config ARCH_DEFCONFIG config ARCH_PROC_KCORE_TEXT def_bool y +config ARCH_ATU + bool + default y if SPARC64 + config IOMMU_HELPER bool default y if SPARC64 @@ -304,6 +308,20 @@ config ARCH_SPARSEMEM_ENABLE config ARCH_SPARSEMEM_DEFAULT def_bool y if SPARC64 +config FORCE_MAX_ZONEORDER + int "Maximum zone order" + default "13" + 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 13 means that the largest free memory block is 2^12 pages. + source "mm/Kconfig" if SPARC64