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um: Switch to large mcmodel on x86_64 

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 <richard@nod.at>
Reported-by: 전하늘 <allskyee@gmail.com>
This commit is contained in:
Richard Weinberger 2012-01-24 20:09:12 +01:00
parent 9310da0bbb
commit 12783aa077
1 changed files with 1 additions and 0 deletions
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arch/um/Makefile
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@ -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)