From: Dodji Seketeli <dodji@redhat.com>
To: "Kinsella, Ray" <mdr@ashroe.eu>
Cc: Dodji Seketeli <dodji@redhat.com>,
Thomas Monjalon <thomas@monjalon.net>,
Neil Horman <nhorman@tuxdriver.com>,
Akhil Goyal <akhil.goyal@nxp.com>,
Konstantin Ananyev <konstantin.ananyev@intel.com>,
Abhinandan Gujjar <abhinandan.gujjar@intel.com>,
dev@dpdk.org, david.marchand@redhat.com
Subject: Re: [dpdk-dev] [PATCH v1] devtools: update abi ignore for cryptodev
Date: Sun, 24 Jan 2021 12:58:25 +0100 [thread overview]
Message-ID: <871reaim1q.fsf@redhat.com> (raw)
In-Reply-To: <25c11a4f-0ac8-ab84-fa29-fd706e018361@ashroe.eu> (Ray Kinsella's message of "Fri, 22 Jan 2021 13:12:23 +0000")
"Kinsella, Ray" <mdr@ashroe.eu> writes:
> On 22/01/2021 13:09, Dodji Seketeli wrote:
>> Thomas Monjalon <thomas@monjalon.net> writes:
>>
>> [...]
>>
>>>>> Then I've added (quickly) a libabigail exception rule:
>>>>>
>>>>> [suppress_type]
>>>>> name = rte_cryptodev
>>>>> has_data_member_inserted_between = {0, 1023}
>>>>>
>>>>> Now we want to improve this rule to restrict the offsets
>>>>> to the padding at the end of the struct only,
>>>>> so we keep forbidding changes in existing fields,
>>>>> and forbidding additions further the current struct size.
>>>>> Is this new rule good?
>>>>>
>>>>> has_data_member_inserted_between = {offset_after(attached), end}
>>>>
>>>>
>>>> Yes, this rule should do what you think it says.
>>>>
>>>>> Do you confirm that the keyword "end" means the old reference size?
>>>>
>>>> Yes I do.
>>>>
>>>>
>>>>> What else do we need to check for adding a new field in a padding?
>>>>
>>>> Actually, that rule will work independantly of it there is enough
>>>> padding or not. It'll shut down the change report, even if the added
>>>> data exceeds the padding.
>>>
>>> I don't understand why.
>>> If "end" means the old reference size, then addition after the old size
>>> should be reported, isn't it?
>>
>> Yes, you are right.
>>
>> What I meant is that even if (in an hypothetical case, not yours) the
>> padding was so "small" that it wasn't going up to the 'end' of the
>> struct, that rule would have still shut down the change report.
>
> Understood - you are talking about padding between members.
Exactly.
Cheers,
--
Dodji
next prev parent reply other threads:[~2021-01-24 11:58 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-20 14:25 Ray Kinsella
2021-01-20 15:41 ` Thomas Monjalon
2021-01-21 15:15 ` Dodji Seketeli
2021-01-21 15:58 ` Thomas Monjalon
2021-01-22 12:11 ` Kinsella, Ray
2021-01-22 13:09 ` Dodji Seketeli
2021-01-22 13:12 ` Kinsella, Ray
2021-01-24 11:58 ` Dodji Seketeli [this message]
2021-01-26 11:55 ` Thomas Monjalon
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