svn commit: r357293 - head/sys/net
Jeff Roberson
jroberson at jroberson.net
Thu Jan 30 21:14:27 UTC 2020
On Thu, 30 Jan 2020, Hans Petter Selasky wrote:
> On 2020-01-30 21:56, Gleb Smirnoff wrote:
>> On Thu, Jan 30, 2020 at 12:04:03PM +0000, Hans Petter Selasky wrote:
>> H> Author: hselasky
>> H> Date: Thu Jan 30 12:04:02 2020
>> H> New Revision: 357293
>> H> URL: https://svnweb.freebsd.org/changeset/base/357293
>> H>
>> H> Log:
>> H> Widen EPOCH(9) usage in netisr.
>> H>
>> H> Software interrupt handlers are allowed to sleep. In swi_net() there
>> H> is a read lock behind NETISR_RLOCK() which in turn ends up calling
>> H> msleep() which means the whole of swi_net() cannot be protected by an
>> H> EPOCH(9) section. By default the NETISR_LOCKING feature is disabled.
>> H>
>> H> This issue was introduced by r357004. This is a preparation step for
>> H> replacing the functionality provided by r357004.
>> H>
>> H> Found by: kib@
>> H> Sponsored by: Mellanox Technologies
>>
>> What?! NETISR_RLOCK() which in turn ends up calling msleep()? Can you
>> please
>> explain this nonsense?
>>
>
> See rms_rlock_fallback() in kern_rmlock.c .
The network stack uses rm_ not rms_.
Jeff
>
> --HPS
>
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