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From: Andrii Nakryiko <andriin@fb.com>
To: <bpf@vger.kernel.org>, <netdev@vger.kernel.org>, <ast@fb.com>,
	<daniel@iogearbox.net>
Cc: <andrii.nakryiko@gmail.com>, <kernel-team@fb.com>,
	Andrii Nakryiko <andriin@fb.com>
Subject: [PATCH bpf-next 0/4] libbpf: minimize feature detection (reallocarray, libelf-mmap)
Date: Tue, 18 Aug 2020 14:59:04 -0700	[thread overview]
Message-ID: <20200818215908.2746786-1-andriin@fb.com> (raw)

Get rid of two feature detectors: reallocarray and libelf-mmap. Optional
feature detections complicate libbpf Makefile and cause more troubles for
various applications that want to integrate libbpf as part of their build.

Patch #1 replaces all reallocarray() uses into libbpf-internal reallocarray()
implementation. Patches #2 and #3 makes sure we won't re-introduce
reallocarray() accidentally. Patch #2 also removes last use of
libbpf_internal.h header inside bpftool. There is still nlattr.h that's used
by both libbpf and bpftool, but that's left for a follow up patch to split.
Patch #4 removed libelf-mmap feature detector and all its uses, as it's
trivial to handle missing mmap support in libbpf, the way objtool has been
doing it for a while.

Andrii Nakryiko (4):
  libbpf: remove any use of reallocarray() in libbpf
  tools/bpftool: remove libbpf_internal.h usage in bpftool
  libbpf: centralize poisoning and poison reallocarray()
  tools: remove feature-libelf-mmap feature detection

 tools/bpf/bpftool/gen.c                |   2 -
 tools/bpf/bpftool/net.c                | 299 +++++++++++++++++++++++--
 tools/build/Makefile.feature           |   1 -
 tools/build/feature/Makefile           |   4 -
 tools/build/feature/test-all.c         |   4 -
 tools/build/feature/test-libelf-mmap.c |   9 -
 tools/lib/bpf/Makefile                 |  10 +-
 tools/lib/bpf/bpf.c                    |   3 -
 tools/lib/bpf/bpf_prog_linfo.c         |   3 -
 tools/lib/bpf/btf.c                    |  14 +-
 tools/lib/bpf/btf_dump.c               |   9 +-
 tools/lib/bpf/hashmap.c                |   3 +
 tools/lib/bpf/libbpf.c                 |  38 ++--
 tools/lib/bpf/libbpf_internal.h        |  44 +++-
 tools/lib/bpf/libbpf_probes.c          |   3 -
 tools/lib/bpf/netlink.c                | 128 +----------
 tools/lib/bpf/nlattr.c                 |   9 +-
 tools/lib/bpf/ringbuf.c                |   8 +-
 tools/lib/bpf/xsk.c                    |   3 -
 tools/perf/Makefile.config             |   4 -
 tools/perf/util/symbol.h               |   2 +-
 21 files changed, 353 insertions(+), 247 deletions(-)
 delete mode 100644 tools/build/feature/test-libelf-mmap.c

-- 
2.24.1


             reply	other threads:[~2020-08-18 21:59 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-18 21:59 Andrii Nakryiko [this message]
2020-08-18 21:59 ` [PATCH bpf-next 1/4] libbpf: remove any use of reallocarray() in libbpf Andrii Nakryiko
2020-08-18 21:59 ` [PATCH bpf-next 2/4] tools/bpftool: remove libbpf_internal.h usage in bpftool Andrii Nakryiko
2020-08-18 21:59 ` [PATCH bpf-next 3/4] libbpf: centralize poisoning and poison reallocarray() Andrii Nakryiko
2020-08-18 21:59 ` [PATCH bpf-next 4/4] tools: remove feature-libelf-mmap feature detection Andrii Nakryiko
2020-08-19  1:08   ` Alexei Starovoitov
2020-08-19  1:19     ` Andrii Nakryiko

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