svn commit: r324673 - head/sys/kern

[Harry Schmalzbauer]

 Bezüglich Andriy Voskoboinyk's Nachricht vom 17.10.2017 00:50 (localtime):
> Tue, 17 Oct 2017 00:53:28 +0300 було написано Bryan Drewery
> <bdrewery at freebsd.org>:
>
>> On 10/16/2017 2:46 PM, Andriy Voskoboinyk wrote:
>>> Author: avos
>>> Date: Mon Oct 16 21:46:11 2017
>>> New Revision: 324673
>>> URL: https://svnweb.freebsd.org/changeset/base/324673
>>>
>>> Log:
>>>   mbuf(9): unbreak m_fragment()
>>
>> How was it broken
>
> Due to m_cat() usage reason (as described below); this part was
> not changed since function creation in r119644.
>
>> and since when?
>
> No idea here - probably, it was partially working until m_cat()
> improvement in r242256.
>
> P.S. Just checked with m_fragment(m, M_NOWAIT, -2) placed
> right before ieee80211_mbuf_defrag() (from D4077) and
> various m_len printf's before and after - it defragments
> frames before this change and works as intended after it.
>
>>
>>>
>>>   - Fix it by replacing m_cat() with m_prev->m_next = m_new
>>>   (m_cat() will try to append data - as a result, there will be no
>>>   fragmentation).
>>>   - Move some constants out of the loop.
>>>
>>>   Was previously tested with D4077.
>>>
>>>   Differential Revision:    https://reviews.freebsd.org/D4090


Will r324673 be MFCd before 11.2?

Thanks,

-harry