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Message-ID: <c2f564a3-f942-d275-3ecb-b679aa0810ec@linux.dev>
Date: Sun, 20 Aug 2023 21:34:37 -0700
From: Yonghong Song <yonghong.song@...ux.dev>
To: Rong Tao <rtoax@...mail.com>
Cc: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
daniel@...earbox.net, haoluo@...gle.com, john.fastabend@...il.com,
kpsingh@...nel.org, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org, martin.lau@...ux.dev,
mykolal@...com, olsajiri@...il.com, rongtao@...tc.cn,
sdf@...gle.com, shuah@...nel.org, song@...nel.org
Subject: Re: [PATCH bpf-next v5] selftests/bpf: trace_helpers.c: optimize
kallsyms cache
On 8/20/23 7:03 PM, Rong Tao wrote:
> Sorry Song, I did not state clear.
>
> libbpf_ensure_mem() is declared in libbpf_internal.h, we want to use
> libbpf_ensure_mem() in trace_helpers.c, Unforturnately, we could only include
> the headers 'install_headers:' defined in tools/lib/bpf/Makefile, the
> 'install_headers:' target does not include libbpf_internal.h, like:
>
> tools/testing/selftests/bpf/trace_helpers.c:17:10:
> fatal error: libbpf_internal.h: No such file or directory
> 17 | #include "libbpf_internal.h"
> | ^~~~~~~~~~~~~~~~~~~
>
> tools/testing/selftests/bpf/trace_helpers.c:17:10:
> fatal error: bpf/libbpf_internal.h: No such file or directory
> 17 | #include "bpf/libbpf_internal.h"
> | ^~~~~~~~~~~~~~~~~~~~~~~
It works fine for me. On top of your patch, the following works fine:
diff --git a/tools/testing/selftests/bpf/trace_helpers.c
b/tools/testing/selftests/bpf/trace_helpers.c
index 0053ba22f0cb..087383c5dc3a 100644
--- a/tools/testing/selftests/bpf/trace_helpers.c
+++ b/tools/testing/selftests/bpf/trace_helpers.c
@@ -14,6 +14,7 @@
#include <linux/limits.h>
#include <libelf.h>
#include <gelf.h>
+#include "bpf/libbpf_internal.h"
#define TRACEFS_PIPE "/sys/kernel/tracing/trace_pipe"
#define DEBUGFS_PIPE "/sys/kernel/debug/tracing/trace_pipe"
With V=1 when building selftests, the following is the compilation
command line:
clang --target=x86_64-linux-gnu -fintegrated-as -g -O0 -rdynamic -Wall
-Werror -I/home/yhs/work/bpf-next/tools/testing/selftests/bpf
-I/home/yhs/work/bpf-next/tools/testing/selftests/bpf/tools/include
-I/home/yhs/work/bpf-next/include/generated
-I/home/yhs/work/bpf-next/tools/lib
-I/home/yhs/work/bpf-next/tools/include
-I/home/yhs/work/bpf-next/tools/include/uapi
-I/home/yhs/work/bpf-next/tools/testing/selftests/bpf
-Wno-unused-command-line-argument -c trace_helpers.c -lelf -lz -lrt
-lpthread -o
/home/yhs/work/bpf-next/tools/testing/selftests/bpf/trace_helpers.o
This include path
/home/yhs/work/bpf-next/tools/testing/selftests/bpf/tools/include
will make including 'bpf/libbpf_internal.h' work.
>
> How about
>
> 1. dup-declare libbpf_ensure_mem() in trace_helpers.c
> 2. move libbpf_ensure_mem() declare into libbpf_common.h
>
> Which one do you like best.
>
> Best wishes,
> Rong Tao
>
>
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