From e9107f88c985bcda5a8ec692cd692005738136f1 Mon Sep 17 00:00:00 2001 From: Markos Chandras <markos.chandras@imgtec.com> Date: Thu, 3 Apr 2014 14:48:32 -0700 Subject: [PATCH] samples/seccomp/Makefile: do not build tests if cross-compiling for MIPS The Makefile is designed to use the host toolchain so it may be unsafe to build the tests if the kernel has been configured and built for another architecture. This fixes a build problem when the kernel has been configured and built for the MIPS architecture but the host is not MIPS (cross-compiled). The MIPS syscalls are only defined if one of the following is true: 1) _MIPS_SIM == _MIPS_SIM_ABI64 2) _MIPS_SIM == _MIPS_SIM_ABI32 3) _MIPS_SIM == _MIPS_SIM_NABI32 Of course, none of these make sense on a non-MIPS toolchain and the following build problem occurs when building on a non-MIPS host. linux/usr/include/linux/kexec.h:50: userspace cannot reference function or variable defined in the kernel samples/seccomp/bpf-direct.c: In function `emulator': samples/seccomp/bpf-direct.c:76:17: error: `__NR_write' undeclared (first use in this function) Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- samples/seccomp/Makefile | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/samples/seccomp/Makefile b/samples/seccomp/Makefile index 7203e66dcd6f..1b4e4b8f5e47 100644 --- a/samples/seccomp/Makefile +++ b/samples/seccomp/Makefile @@ -18,8 +18,8 @@ HOSTCFLAGS_bpf-direct.o += -idirafter $(objtree)/include bpf-direct-objs := bpf-direct.o # Try to match the kernel target. -ifndef CONFIG_64BIT ifndef CROSS_COMPILE +ifndef CONFIG_64BIT # s390 has -m31 flag to build 31 bit binaries ifndef CONFIG_S390 @@ -36,7 +36,13 @@ HOSTLOADLIBES_bpf-direct += $(MFLAG) HOSTLOADLIBES_bpf-fancy += $(MFLAG) HOSTLOADLIBES_dropper += $(MFLAG) endif -endif - -# Tell kbuild to always build the programs always := $(hostprogs-y) +else +# MIPS system calls are defined based on the -mabi that is passed +# to the toolchain which may or may not be a valid option +# for the host toolchain. So disable tests if target architecture +# is MIPS but the host isn't. +ifndef CONFIG_MIPS +always := $(hostprogs-y) +endif +endif -- 2.20.1