uml: fix kernel stack size on x86_64

Force KERNEL_STACK_ORDER to be at least 1 on UML/x86_64, to avoid overflows.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index c504312219b42b8f9797c50fe1569e5f05163a84..e6ff30266542a79b8909a5ef5f4e7991e58e16ca 100644 (file)
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -278,6 +278,7 @@ config HIGHMEM
 config KERNEL_STACK_ORDER
        int "Kernel stack size order"
        default 1 if 64BIT
+       range 1 10 if 64BIT
        default 0 if !64BIT
        help
        This option determines the size of UML kernel stacks.  They will