linux-kernel - Re: [PATCH 2/2] perf build: Allow explicitely disabling the NO_SYSCALL

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Date:   Fri, 29 May 2020 16:45:15 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 2/2] perf build: Allow explicitely disabling the
 NO_SYSCALL_TABLE variable

Em Fri, May 29, 2020 at 08:07:17PM +0200, Jiri Olsa escreveu:
> On Fri, May 29, 2020 at 12:55:52PM -0300, Arnaldo Carvalho de Melo wrote:
> > From: Arnaldo Carvalho de Melo <acme@...hat.com>
> > 
> > This is useful to see if, on x86, the legacy libaudit still works, as it
> > is used in architectures that don't have the SYSCALL_TABLE logic and we
> > want to have it tested in 'make -C tools/perf/ build-test'.
> > 
> > E.g.:
> > 
> > Without having audit-libs-devel installed:
> > 
> >   $ make NO_SYSCALL_TABLE=1 O=/tmp/build/perf -C tools/perf install-bin
> >   make: Entering directory '/home/acme/git/perf/tools/perf'
> >     BUILD:   Doing 'make -j12' parallel build
> >   <SNIP>
> >   Auto-detecting system features:
> >   <SNIP>
> >   ...                      libaudit: [ OFF ]
> >   ...                        libbfd: [ on  ]
> >   ...                        libcap: [ on  ]
> >   <SNIP>
> >   Makefile.config:664: No libaudit.h found, disables 'trace' tool, please install audit-libs-devel or libaudit-dev
> >   <SNIP>
> > 
> > After installing it:
> > 
> >   $ rm -rf /tmp/build/perf ; mkdir -p /tmp/build/perf
> >   $ time make NO_SYSCALL_TABLE=1 O=/tmp/build/perf  -C tools/perf install-bin ; perf test python
> 
> heya,
> seems ok, perhaps also put it in comment to Makefile.perf
> among other NO_* stuff and to tests/make


Added this and your Acked-by (from the "seems ok") :-) Ok?

- Arnaldo

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 30e41dcd4095..e3a34af38130 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -118,6 +118,9 @@ include ../scripts/utilities.mak
 #
 # Define LIBBPF_DYNAMIC to enable libbpf dynamic linking.
 #
+# Define NO_SYSCALL_TABLE=1 to disable the use of syscall id to/from name tables
+# generated from the kernel .tbl or unistd.h files and use, if available, libaudit
+# for doing the conversions to/from strings/id.
 
 # As per kernel Makefile, avoid funny character set dependencies
 unexport LC_ALL