linux-kernel - Re: [PATCH 4/4] selftests/bpf: fix compiling errors

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Message-ID: <20180326145511.lzoi6wja6iht5lvq@ast-mbp.dhcp.thefacebook.com>
Date:   Mon, 26 Mar 2018 07:55:13 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     changbin.du@...el.com
Cc:     shuah@...nel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 4/4] selftests/bpf: fix compiling errors

On Mon, Mar 26, 2018 at 05:23:28PM +0800, changbin.du@...el.com wrote:
> From: Changbin Du <changbin.du@...el.com>
> 
> This patch fixed below errors of missing head files.
> 
> tools/testing/selftests$ make
> ...
> clang -I. -I./include/uapi -I../../../include/uapi -Wno-compare-distinct-pointer-types \
> 	 -O2 -target bpf -emit-llvm -c test_pkt_access.c -o - |      \
> llc -march=bpf -mcpu=generic -filetype=obj -o /home/changbin/work/linux/tools/testing/selftests/bpf//test_pkt_access.o
> In file included from test_pkt_access.c:9:
> In file included from ../../../include/uapi/linux/bpf.h:11:
> In file included from ./include/uapi/linux/types.h:5:
> /usr/include/asm-generic/int-ll64.h:11:10: fatal error: 'asm/bitsperlong.h' file not found
>  #include <asm/bitsperlong.h>
>          ^
> 1 error generated.
> clang -I. -I./include/uapi -I../../../include/uapi -Wno-compare-distinct-pointer-types \
> 	 -O2 -target bpf -emit-llvm -c test_xdp.c -o - |      \
> llc -march=bpf -mcpu=generic -filetype=obj -o /home/changbin/work/linux/tools/testing/selftests/bpf//test_xdp.o
> In file included from test_xdp.c:9:
> In file included from ../../../include/uapi/linux/bpf.h:11:
> In file included from ./include/uapi/linux/types.h:5:
> /usr/include/asm-generic/int-ll64.h:11:10: fatal error: 'asm/bitsperlong.h' file not found
>  #include <asm/bitsperlong.h>
>          ^
> 1 error generated.
> clang -I. -I./include/uapi -I../../../include/uapi -Wno-compare-distinct-pointer-types \
> 	 -O2 -target bpf -emit-llvm -c test_l4lb.c -o - |      \
> llc -march=bpf -mcpu=generic -filetype=obj -o /home/changbin/work/linux/tools/testing/selftests/bpf//test_l4lb.o
> In file included from test_l4lb.c:10:
> In file included from /usr/include/linux/pkt_cls.h:4:
> In file included from ./include/uapi/linux/types.h:5:
> /usr/include/asm-generic/int-ll64.h:11:10: fatal error: 'asm/bitsperlong.h' file not found
>  #include <asm/bitsperlong.h>
>          ^
> 1 error generated.
> clang -I. -I./include/uapi -I../../../include/uapi -Wno-compare-distinct-pointer-types \
> 	 -O2 -target bpf -emit-llvm -c test_tcp_estats.c -o - |      \
> llc -march=bpf -mcpu=generic -filetype=obj -o /home/changbin/work/linux/tools/testing/selftests/bpf//test_tcp_estats.o
> In file included from test_tcp_estats.c:35:
> In file included from ../../../include/uapi/linux/bpf.h:11:
> In file included from ./include/uapi/linux/types.h:5:
> /usr/include/asm-generic/int-ll64.h:11:10: fatal error: 'asm/bitsperlong.h' file not found
>  #include <asm/bitsperlong.h>
> ...
> 
> Signed-off-by: Changbin Du <changbin.du@...el.com>
> ---
>  tools/testing/selftests/bpf/Makefile | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index 5c43c18..dc0fdc8 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -10,7 +10,8 @@ ifneq ($(wildcard $(GENHDR)),)
>    GENFLAGS := -DHAVE_GENHDR
>  endif
>  
> -CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include
> +CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) \
> +	  -I../../../include -I../../../../usr/include
>  LDLIBS += -lcap -lelf -lrt -lpthread
>  
>  # Order correspond to 'make run_tests' order
> @@ -62,7 +63,7 @@ else
>    CPU ?= generic
>  endif
>  
> -CLANG_FLAGS = -I. -I./include/uapi -I../../../include/uapi \
> +CLANG_FLAGS = -I. -I./include/uapi -I../../../include/uapi -I../../../../usr/include \
>  	      -Wno-compare-distinct-pointer-types

Nack.
I suspect that will break the build for everyone else who's doing it in the directory
itself instead of the outer one.