From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Ian Rogers <irogers@google.com>,
Namhyung Kim <namhyung@kernel.org>,
Pekka Enberg <penberg@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Irina Tirdea <irina.tirdea@intel.com>,
bpf@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: libbpf's hashmap use of __WORDSIZE
Date: Mon, 8 Jun 2020 13:11:50 -0300 [thread overview]
Message-ID: <20200608161150.GA3073@kernel.org> (raw)
Hi Andrii,
We've got that hashmap.[ch] copy from libbpf so that we can
build perf in systems where libbpf isn't available, and to make it build
in all the containers I regularly test build perf I had to add the patch
below, I test build with many versions of both gcc and clang and
multiple libcs.
https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html
The way that tools/include/linux/bitops.h has been doing since 2012 is
explained in:
http://git.kernel.org/torvalds/c/3f34f6c0233ae055b5
Please take a look and see if you find it acceptable,
Thanks,
- Arnaldo
Warning: Kernel ABI header at 'tools/perf/util/hashmap.h' differs from latest version at 'tools/lib/bpf/hashmap.h'
diff -u tools/perf/util/hashmap.h tools/lib/bpf/hashmap.h
$ diff -u tools/lib/bpf/hashmap.h tools/perf/util/hashmap.h
--- tools/lib/bpf/hashmap.h 2020-06-05 13:25:27.822079838 -0300
+++ tools/perf/util/hashmap.h 2020-06-05 13:25:27.838079794 -0300
@@ -10,10 +10,9 @@
#include <stdbool.h>
#include <stddef.h>
-#ifdef __GLIBC__
-#include <bits/wordsize.h>
-#else
-#include <bits/reg.h>
+#include <limits.h>
+#ifndef __WORDSIZE
+#define __WORDSIZE (__SIZEOF_LONG__ * 8)
#endif
static inline size_t hash_bits(size_t h, int bits)
next reply other threads:[~2020-06-08 16:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-08 16:11 Arnaldo Carvalho de Melo [this message]
2020-06-08 17:32 ` libbpf's hashmap use of __WORDSIZE Andrii Nakryiko
2020-06-08 18:12 ` Arnaldo Carvalho de Melo
2020-06-09 15:34 ` [PATCH] libbpf: Define __WORDSIZE if not available Arnaldo Carvalho de Melo
2020-06-09 20:37 ` Daniel Borkmann
2020-06-09 21:16 ` Arnaldo Carvalho de Melo
2020-06-09 23:21 ` Daniel Borkmann
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