On 02/13/2014 05:27 PM, Markos Chandras wrote:
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) Cc: linux-next@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxx Reported-by: Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx> --- This problem is only reproducible on the linux-next tree at the moment --- samples/seccomp/Makefile | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/samples/seccomp/Makefile b/samples/seccomp/Makefile index 7203e66..f6bda1c 100644 --- a/samples/seccomp/Makefile +++ b/samples/seccomp/Makefile @@ -17,9 +17,14 @@ HOSTCFLAGS_bpf-direct.o += -I$(objtree)/usr/include HOSTCFLAGS_bpf-direct.o += -idirafter $(objtree)/include bpf-direct-objs := bpf-direct.o +# 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 # 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 @@ -40,3 +45,4 @@ endif # Tell kbuild to always build the programs always := $(hostprogs-y) +endif
CC'ing the correct linux-kernel address. Sorry about that. -- markos
