linux-kernel - Re: [PATCH v6 1/3] check-uapi: Introduce check-uapi.sh

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Date:   Tue, 14 Nov 2023 07:24:55 -0500
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     John Moon <quic_johmoo@...cinc.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Jonathan Corbet <corbet@....net>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, kernel@...cinc.com,
        Randy Dunlap <rdunlap@...radead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Andersson <andersson@...nel.org>,
        Todd Kjos <tkjos@...gle.com>,
        Matthias Maennich <maennich@...gle.com>,
        Giuliano Procida <gprocida@...gle.com>,
        kernel-team@...roid.com, libabigail@...rceware.org,
        Dodji Seketeli <dodji@...hat.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>,
        Jordan Crouse <jorcrous@...zon.com>
Subject: Re: [PATCH v6 1/3] check-uapi: Introduce check-uapi.sh

On Tue, Nov 14, 2023 at 07:10:51PM +0900, Masahiro Yamada wrote:
> On Sat, Oct 28, 2023 at 4:31 AM John Moon <quic_johmoo@...cinc.com> wrote:
> >
> > While the kernel community has been good at maintaining backwards
> > compatibility with kernel UAPIs, it would be helpful to have a tool
> > to check if a commit introduces changes that break backwards
> > compatibility.
> >
> > To that end, introduce check-uapi.sh: a simple shell script that
> > checks for changes to UAPI headers using libabigail.
> >
> > libabigail is "a framework which aims at helping developers and
> > software distributors to spot some ABI-related issues like interface
> > incompatibility in ELF shared libraries by performing a static
> > analysis of the ELF binaries at hand."
> >
> > The script uses one of libabigail's tools, "abidiff", to compile the
> > changed header before and after the commit to detect any changes.
> >
> > abidiff "compares the ABI of two shared libraries in ELF format. It
> > emits a meaningful report describing the differences between the two
> > ABIs."
> >
> > The script also includes the ability to check the compatibility of
> > all UAPI headers across commits. This allows developers to inspect
> > the stability of the UAPIs over time.
> >
> > Signed-off-by: John Moon <quic_johmoo@...cinc.com>
> > ---
> >     - Add abidiff suppressions to filter out common things like enum
> >       variants named .*_MAX being changed and expansion into padding
> >       fields.
> >     - Bump minimum abidiff version to 2.4 to accomodate new
> >       suppressions.
> >     - Add option (-i) to suppress ambiguous breaking changes.
> >     - Remove printing of full file diffs when ABI breakage is found
> >       as this was too noisy.
> >     - Wait for all files to be checked before printing results as
> >       printing from parallel threads was garbling output.
> >     - Suppress all output when -q is passed.
> >     - Avoid messing up user's git tree by using "git archive" instead
> >       of checking out references.
> 
> 
> 
> The code looks almost good to me.
> 
> (I left some more comments below, but they are minor).
> 
> 
> 
> Greg,
> Could you check the output from the tool?

I will, give me a chance to catch up after the merge window and this
week at Plumbers....  Should be a week or so, thanks.

greg k-h