linux-kernel - Re: [PATCH 3/4] perf tools: Fix check-headers.sh output file variables

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Date:   Tue, 24 Jul 2018 08:20:07 +0100
From:   Alexander Kapshuk <alexander.kapshuk@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     acme@...nel.org, jolsa@...nel.org,
        linux-kernel <linux-kernel@...r.kernel.org>, mingo@...nel.org,
        namhyung@...nel.org, dsahern@...il.com,
        alexander.shishkin@...ux.intel.com, a.p.zijlstra@...llo.nl
Subject: Re: [PATCH 3/4] perf tools: Fix check-headers.sh output file variables

On Mon, Jul 23, 2018, 08:01 Jiri Olsa <jolsa@...hat.com> wrote:

> On Fri, Jul 20, 2018 at 06:22:49PM +0300, Alexander Kapshuk wrote:
> > On Fri, Jul 20, 2018 at 6:16 PM Jiri Olsa <jolsa@...hat.com> wrote:
> > >
> > > On Fri, Jul 20, 2018 at 11:57:45AM -0300, Arnaldo Carvalho de Melo
> wrote:
> > > > Em Fri, Jul 20, 2018 at 01:00:35PM +0200, Jiri Olsa escreveu:
> > > > > The warning message in check_w function uses wrongly
> > > > > the $file variable instead of $file1 and $file2.
> > > >
> > > > Humm,
> > > >
> > > > Before:
> > > >
> > > > Warning: Kernel ABI header at
> 'tools/arch/powerpc/include/uapi/asm/unistd.h' differs from latest version
> at 'arch/powerpc/include/uapi/asm/unistd.h'
> > > >
> > > > After:
> > > >
> > > > Warning: Kernel ABI header at
> '../arch/powerpc/include/uapi/asm/unistd.h' differs from latest version at
> '../../arch/powerpc/include/uapi/asm/unistd.h'
> > > >
> > > >
> > > > The previous version is better, I can then just use:
> > > >
> > > > diff -u tools/arch/powerpc/include/uapi/asm/unistd.h
> arch/powerpc/include/uapi/asm/unistd.h
> > > >
> > > > and get what changed, with your change I have to go to tools/perf
> before
> > > > doing that diff, which is an unnecessary extra step in at least my
> > > > workflow.
> > >
> > > so all paths output based in kernel tree root then, will change
> > >
> > > jirka
> >
> > I was going to ask about this in a separate email initially, but then
> > thought I'd use this email exchange instead, as my question is about
> > the code in question. Hope you don't mind.
> >
> > If I'm reading this right, the intended behavoir of the block of code
> > below is to test file2 for existance, and if it exists, to evaluate $cmd.
> > If file1 and file2 are found to differ, print the warning.
> >
> > test -f $file2 &&
> >   eval $cmd || echo "Warning: Kernel ABI header at 'tools/$file'
> > differs from latest version at '$file'" >&2
> >
> > The '||' path of execution is however also taken if file2 doesn't exist,
> > which is probably very unlikely to happen. See below.
> >
> > % file1=file1; file2=file2
> > % cmd="echo diff $file1 $file2"
> > % test -f $file2 &&
> > eval $cmd || echo "Warning: Kernel ABI header at 'tools/$file1'
> > differs from latest version at '$file2'" >&2
> > Warning: Kernel ABI header at 'tools/file1' differs from latest
> > version at 'file2'
> >
> > Is this something you would rather leave as is, or perhaps use something
> > along the lines of the code below instead:
> >
> > test -f $file2 && {
> > eval $cmd ||
> > echo "Warning: Kernel ABI header at 'tools/$file' differs from latest
> > version at '$file'" >&2
> > }
>
> hi,
> yea, probably..  please feel free to post a patch.. just make sure all
> the displayed files paths are based on the kernel root
>
> thanks,
> jirka
>

I'm away traveling till August 10th, and I may not be able to send the
patch in until I get back. Is that OK?
Thanks.

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