linux-kernel - Re: [PATCH 1/4] perf ui progress: Make sure we always define step value

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Date:   Fri, 8 Sep 2017 10:26:42 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Milian Wolff <milian.wolff@...b.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 1/4] perf ui progress: Make sure we always define step
 value

Em Fri, Sep 08, 2017 at 03:16:37PM +0200, Milian Wolff escreveu:
> On Freitag, 8. September 2017 14:05:07 CEST Jiri Olsa wrote:
> > +++ b/tools/perf/ui/progress.c
> > @@ -25,7 +25,7 @@ void ui_progress__update(struct ui_progress *p, u64 adv)
> >  void ui_progress__init(struct ui_progress *p, u64 total, const char *title)
> > {
> >  	p->curr = 0;
> > -	p->next = p->step = total / 16;
> > +	p->next = p->step = total / 16 ?: 1;
> >  	p->total = total;
> >  	p->title = title;
> 
> This is a GNU extension, does this compile with clang?

Huh?

[acme@...et linux]$ find tools/ -name "*.[ch]"| xargs grep ?: | wc -l
64
[acme@...et linux]$ find . -name "*.[ch]"| xargs grep ?: | wc -l
725
[acme@...et linux]$

And yes, tools/perf/ is built with clang regularly, I use containers to
test build the tools/{perf,lib} codebase with gcc and clang on almost
all distros, things like:

[acme@...et linux]$ cat ~/git/linux-perf-tools-build/fedora/26/Dockerfile 
# docker.io/acmel/linux-perf-tools-build-fedora:26
FROM docker.io/fedora:26
MAINTAINER Arnaldo Carvalho de Melo <acme@...nel.org>
# The second dnf line is to be able to build a kernel, do a make header_install, etc,
# So that we can build samples/bpf/ and the kernel
RUN dnf -y install make gcc flex bison elfutils-libelf-devel \
		   bc findutils clang llvm openssl git \
		   elfutils-devel libunwind-devel audit-libs-devel \
		   openssl-devel slang-devel gtk2-devel perl-ExtUtils-Embed \
		   python-devel binutils-devel xz-devel numactl-devel systemtap-sdt-devel \
		   redhat-rpm-config && \
    dnf -y clean all && \
    rm -rf /usr/share/doc /usr/share/gtk-doc /usr/share/locale /usr/share/man && \
    mkdir -m 777 -p /tmp/build/perf /tmp/build/objtool /tmp/build/linux && \
    groupadd -r perfbuilder && \
    useradd -m -r -g perfbuilder perfbuilder && \
    chown -R perfbuilder.perfbuilder /tmp/build
USER perfbuilder
ENTRYPOINT make -C /git/linux/tools/perf O=/tmp/build/perf && \
           rm -rf /tmp/build/perf/{.[^.]*,*} && \
           make -C /git/linux/tools/perf O=/tmp/build/perf CC=clang && \
           rm -rf /tmp/build/perf/{.[^.]*,*} && \
           make NO_LIBELF=1 -C /git/linux/tools/perf O=/tmp/build/perf && \
           rm -rf /tmp/build/perf/{.[^.]*,*} && \
           make NO_LIBELF=1 -C /git/linux/tools/perf O=/tmp/build/perf CC=clang && \
           make -C /git/linux/tools/objtool O=/tmp/build/objtool && \
           make -C /git/linux O=/tmp/build/linux defconfig && \
           make -C /git/linux O=/tmp/build/linux headers_install && \
           make -C /git/linux O=/tmp/build/linux samples/bpf/
[acme@...et linux]$

- Arnaldo