linux-kernel - Re: [PATCH] libbpf: Define _

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Message-ID: <20200609211653.GI24868@kernel.org>
Date:   Tue, 9 Jun 2020 18:16:53 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Pekka Enberg <penberg@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Irina Tirdea <irina.tirdea@...el.com>,
        bpf <bpf@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] libbpf: Define __WORDSIZE if not available

Em Tue, Jun 09, 2020 at 10:37:48PM +0200, Daniel Borkmann escreveu:
> Hey Arnaldo,
> 
> On 6/9/20 5:34 PM, Arnaldo Carvalho de Melo wrote:
> > Some systems, such as Android, don't have a define for __WORDSIZE, do it
> > in terms of __SIZEOF_LONG__, as done in perf since 2012:
> > 
> >    http://git.kernel.org/torvalds/c/3f34f6c0233ae055b5
> > 
> > For reference: https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html
> > 
> > I build tested it here and Andrii did some Travis CI build tests too.
> > 
> > Acked-by: Andrii Nakryiko <andriin@...com>
> > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> Diff missing?

Oh well, sorry about that, EBADCOFFEE or something:

From: Arnaldo Carvalho de Melo <acme@...nel.org>

Some systems, such as Android, don't have a define for __WORDSIZE, do it
in terms of __SIZEOF_LONG__, as done in perf since 2012:

   http://git.kernel.org/torvalds/c/3f34f6c0233ae055b5

For reference: https://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html

I build tested it here and Andrii did some Travis CI build tests too.

Acked-by: Andrii Nakryiko <andriin@...com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

---

diff --git a/tools/lib/bpf/hashmap.h b/tools/lib/bpf/hashmap.h
index e823b35e7371..df59fd4fc95b 100644
--- a/tools/lib/bpf/hashmap.h
+++ b/tools/lib/bpf/hashmap.h
@@ -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)