linux-kernel - Re: [PATCH bpf-next v5] selftests/bpf: trace

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Date:   Mon, 21 Aug 2023 10:03:38 +0800
From:   Rong Tao <rtoax@...mail.com>
To:     yonghong.song@...ux.dev
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,
        rtoax@...mail.com, sdf@...gle.com, shuah@...nel.org,
        song@...nel.org
Subject: Re: [PATCH bpf-next v5] selftests/bpf: trace_helpers.c: optimize kallsyms cache

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"
	      |          ^~~~~~~~~~~~~~~~~~~~~~~

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