linux-kernel - Re: [PATCH v5 1/2] check-uapi: Introduce check-uapi.sh

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Date:   Wed, 12 Apr 2023 09:37:16 -0700
From:   John Moon <quic_johmoo@...cinc.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Nicolas Schier" <nicolas@...sle.eu>,
        <linux-kbuild@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arm-msm@...r.kernel.org>,
        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>,
        Jordan Crouse <jorcrous@...zon.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>,
        Elliot Berman <quic_eberman@...cinc.com>,
        "Guru Das Srinagesh" <quic_gurus@...cinc.com>
Subject: Re: [PATCH v5 1/2] check-uapi: Introduce check-uapi.sh

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.

We'll work internally and with the libabigail team to improve the story 
here and get back to you. Thanks for the discussion!

- John