sparc: add FORCE_MAX_ZONEORDER

Allow for a memory allocation large enough to load a kernel for
kexec in contiguous memory.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 9c56e0d822a93ff74d8261fddbbd013f9a00f50b..f537c6b51b272d9ef0423c0e5019c31e691d00e5 100644 (file)
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -347,6 +347,21 @@ config ARCH_SPARSEMEM_ENABLE
 config ARCH_SPARSEMEM_DEFAULT
        def_bool y if SPARC64
 
+config FORCE_MAX_ZONEORDER
+       int "Maximum zone order"
+       default "13" if KEXEC
+       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 "mm/Kconfig"
 
 if SPARC64