linux-kernel - Re: [PATCH v8 2/8] powerpc/vdso: Remove __kernel_datapage_offset and simplify __get

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Date:   Fri, 23 Oct 2020 13:57:47 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Will Deacon <will@...nel.org>
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>, nathanl@...ux.ibm.com,
        linux-arch <linux-arch@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        open list <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v8 2/8] powerpc/vdso: Remove __kernel_datapage_offset and
 simplify __get_datapage()



Le 23/10/2020 à 13:25, Will Deacon a écrit :
> On Fri, Oct 23, 2020 at 01:22:04PM +0200, Christophe Leroy wrote:
>> Hi Dmitry,
>>
>> Le 28/09/2020 à 17:08, Dmitry Safonov a écrit :
>>> On 9/27/20 8:43 AM, Christophe Leroy wrote:
>>>>
>>>>
>>>> Le 21/09/2020 à 13:26, Will Deacon a écrit :
>>>>> On Fri, Aug 28, 2020 at 12:14:28PM +1000, Michael Ellerman wrote:
>>>>>> Dmitry Safonov <0x7f454c46@...il.com> writes:
>>> [..]
>>>>>>> I'll cook a patch for vm_special_mapping if you don't mind :-)
>>>>>>
>>>>>> That would be great, thanks!
>>>>>
>>>>> I lost track of this one. Is there a patch kicking around to resolve
>>>>> this,
>>>>> or is the segfault expected behaviour?
>>>>>
>>>>
>>>> IIUC dmitry said he will cook a patch. I have not seen any patch yet.
>>>
>>> Yes, sorry about the delay - I was a bit busy with xfrm patches.
>>>
>>> I'll send patches for .close() this week, working on them now.
>>
>> I haven't seen the patches, did you sent them out finally ?
> 
> I think it's this series:
> 
> https://lore.kernel.org/r/20201013013416.390574-1-dima@arista.com
> 
> but they look really invasive to me, so I may cook a small hack for arm64
> in the meantine / for stable.
> 

Not sure we are talking about the same thing.

I can't see any new .close function added to vm_special_mapping in order to replace arch_unmap() hook.

Christophe