linux-kernel - Re: [PATCH v6 02/11] mm/gup: Use functions to track lockless pgtbl walks on gup_pgd

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Message-ID: <3709d0f5-0f92-b003-1d6b-24a61ca2cf1c@linux.ibm.com>
Date:   Fri, 16 Oct 2020 08:57:30 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     Michal Suchánek <msuchanek@...e.de>,
        Leonardo Bras <leonardo@...ux.ibm.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Steven Price <steven.price@....com>,
        Robin Murphy <robin.murphy@....com>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Balbir Singh <bsingharora@...il.com>,
        Reza Arbab <arbab@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, kvm-ppc@...r.kernel.org
Subject: Re: [PATCH v6 02/11] mm/gup: Use functions to track lockless pgtbl
 walks on gup_pgd_range

Hi Michal,

On 10/15/20 8:16 PM, Michal Suchánek wrote:
> Hello,
> 
> On Thu, Feb 06, 2020 at 12:25:18AM -0300, Leonardo Bras wrote:
>> On Thu, 2020-02-06 at 00:08 -0300, Leonardo Bras wrote:
>>>                  gup_pgd_range(addr, end, gup_flags, pages, &nr);
>>> -               local_irq_enable();
>>> +               end_lockless_pgtbl_walk(IRQS_ENABLED);
>>>                  ret = nr;
>>>          }
>>>   
>>
>> Just noticed IRQS_ENABLED is not available on other archs than ppc64.
>> I will fix this for v7.
> 
> Has threre been v7?
> 
> I cannot find it.
> 
> Thanks
> 
> Michal
> 

https://lore.kernel.org/linuxppc-dev/20200505071729.54912-1-aneesh.kumar@linux.ibm.com

This series should help here.

-aneesh