From: Mark Wielaard <mark@klomp.org>
To: John Moon <quic_johmoo@quicinc.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Nicolas Schier <nicolas@fjasle.eu>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org,
Randy Dunlap <rdunlap@infradead.org>,
Arnd Bergmann <arnd@arndb.de>,
Bjorn Andersson <andersson@kernel.org>,
Todd Kjos <tkjos@google.com>,
Matthias Maennich <maennich@google.com>,
Giuliano Procida <gprocida@google.com>,
kernel-team@android.com, libabigail@sourceware.org,
Jordan Crouse <jorcrous@amazon.com>,
Trilok Soni <quic_tsoni@quicinc.com>,
Satya Durga Srinivasu Prabhala <quic_satyap@quicinc.com>,
Elliot Berman <quic_eberman@quicinc.com>,
Guru Das Srinagesh <quic_gurus@quicinc.com>
Subject: Re: [PATCH v5 1/2] check-uapi: Introduce check-uapi.sh
Date: Thu, 13 Apr 2023 16:37:14 +0200 [thread overview]
Message-ID: <718c102205750a00b86e8d33748e9bfb3c485ee1.camel@klomp.org> (raw)
In-Reply-To: <d34a6b09-8244-49e2-2d7a-eee5fd5ca5b7@quicinc.com>
Hi,
On Wed, 2023-04-12 at 09:37 -0700, John Moon via Libabigail wrote:
> On 4/11/2023 11:14 PM, Greg Kroah-Hartman wrote:
> > > Would you find the tool more useful if it simply filtered out all instances
> > > where the size of the type did not change? This would filter out the
> > > following which the tool currently flags:
> > >
> > > - enum expansions
> > > - reserved field expansions
> > > - expansions of a struct with a flex array at the end
> > > - type changes
> > > - re-ordering of existing members
> > > - ...others?
> >
> > Obviously not, as some of those are real breakages, and some are not at
> > all.
> >
> > Please understand what is an abi breakage. Adding new enums is not.
> > Using a reserved field is not. Reording existing members IS.
> >
>
> Yes, understood that method would miss certain classes of breakages. I
> was suggesting it as a way to improve the signal-to-noise ratio of the
> tool since we don't currently have an algorithm for determining
> breakages with 100% accuracy.
Note that you can check the exit code of libabigail's abidiff to see
whether something is an incompatible abi change or not, see:
https://sourceware.org/libabigail/manual/abidiff.html#return-values
You can also of course use suppressions to instruct abidiff to avoid
reporting changes involving certain ABI artifacts:
https://sourceware.org/libabigail/manual/libabigail-concepts.html#suppr-spec-label
Cheers,
Mark
next prev parent reply other threads:[~2023-04-13 14:37 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-07 20:34 [PATCH v5 0/2] Validating UAPI backwards compatibility John Moon
2023-04-07 20:34 ` [PATCH v5 1/2] check-uapi: Introduce check-uapi.sh John Moon
2023-04-10 10:03 ` Masahiro Yamada
2023-04-10 18:45 ` Greg Kroah-Hartman
2023-04-10 23:32 ` John Moon
2023-04-11 6:34 ` Greg Kroah-Hartman
2023-04-11 18:36 ` John Moon
2023-04-12 6:14 ` Greg Kroah-Hartman
2023-04-12 16:37 ` John Moon
2023-04-12 16:43 ` Greg Kroah-Hartman
2023-04-13 17:07 ` John Moon
2023-04-13 18:22 ` Greg Kroah-Hartman
2023-04-13 14:37 ` Mark Wielaard [this message]
2023-04-13 17:12 ` Giuliano Procida
2023-04-13 17:15 ` John Moon
2023-04-13 17:03 ` Nicolas Schier
2023-04-13 17:33 ` John Moon
2023-07-20 16:10 ` [PATCH] scripts/check-uapi.sh: add stgdiff support Giuliano Procida
2023-07-22 19:40 ` Trilok Soni
2023-04-07 20:34 ` [PATCH v5 2/2] docs: dev-tools: Add UAPI checker documentation John Moon
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