From 12783aa077f81e0dcf1b2f97ed24440048e9f09d Mon Sep 17 00:00:00 2001 From: Richard Weinberger Date: Tue, 24 Jan 2012 20:09:12 +0100 Subject: [PATCH] um: Switch to large mcmodel on x86_64 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit x86_64 UML is unable to load modules if more than 504MiB of memory are used. This happens because on x86_64 the UML process has a quite high start address (typically around 0x6000000). If UML's memory is larger than 504MiB VMALLOC_START happens to be after 0x8000000. This is no problem unless one loads a module which was built with R_X86_64_32S relocations. Symbols with a location > 0x8000000 cannot be used with R_X86_64_32S To deal with this x86_64 UML has to be compiled with -mcmodel=large such that no R_X86_64_32S relocations are used. Signed-off-by: Richard Weinberger Reported-by: 전하늘 --- arch/um/Makefile | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/um/Makefile b/arch/um/Makefile index 4c993c89d0f0..55c0661e2b5d 100644 --- a/arch/um/Makefile +++ b/arch/um/Makefile @@ -28,6 +28,7 @@ ifeq ($(SUBARCH),i386) endif ifeq ($(SUBARCH),x86_64) HEADER_ARCH := x86 + KBUILD_CFLAGS += -mcmodel=large endif HOST_DIR := arch/$(HEADER_ARCH) -- 2.20.1