Subject: arm-disable-highmem-on-rt.patch From: Thomas Gleixner Date: Mon, 18 Jul 2011 17:09:28 +0200 Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patches-3.12.1-rt4.tar.xz Signed-off-by: Thomas Gleixner --- arch/arm/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1759,7 +1759,7 @@ config HAVE_ARCH_PFN_VALID config HIGHMEM bool "High Memory Support" - depends on MMU + depends on MMU && !PREEMPT_RT_FULL help The address space of ARM processors is only 4 Gigabytes large and it has to accommodate user address space, kernel address