From: Michael Ellerman <mpe@ellerman.id.au>
To: Nicholas Piggin <npiggin@gmail.com>, peterz@infradead.org
Cc: Jens Axboe <axboe@kernel.dk>,
linux-arch@vger.kernel.org,
"linux-mm \@ kvack . org" <linux-mm@kvack.org>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
linux-kernel@vger.kernel.org,
Andy Lutomirski <luto@amacapital.net>,
Dave Hansen <dave.hansen@intel.com>,
sparclinux@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
linuxppc-dev@lists.ozlabs.org,
"David S . Miller" <davem@davemloft.net>
Subject: Re: [PATCH v2 1/4] mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race
Date: Tue, 15 Sep 2020 21:26:29 +1000 [thread overview]
Message-ID: <87lfhbp9ga.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <1600137586.nypnz3sbcl.astroid@bobo.none>
Nicholas Piggin <npiggin@gmail.com> writes:
> Excerpts from peterz@infradead.org's message of September 14, 2020 8:56 pm:
>> On Mon, Sep 14, 2020 at 02:52:16PM +1000, Nicholas Piggin wrote:
>>> Reading and modifying current->mm and current->active_mm and switching
>>> mm should be done with irqs off, to prevent races seeing an intermediate
>>> state.
...
>>>
>>> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
>>
>> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
>>
>> I'm thinking we want this selected on x86 as well. Andy?
>
> Thanks for the ack. The plan was to take it through the powerpc tree,
> but if you'd want x86 to select it, maybe a topic branch? Although
> Michael will be away during the next merge window so I don't want to
> get too fancy. Would you mind doing it in a follow up merge after
> powerpc, being that it's (I think) a small change?
Or get akpm to take the series, including the x86 change.
cheers
next prev parent reply other threads:[~2020-09-15 11:26 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-14 4:52 [PATCH v2 0/4] more mm switching vs TLB shootdown and lazy tlb fixes Nicholas Piggin
2020-09-14 4:52 ` [PATCH v2 1/4] mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race Nicholas Piggin
2020-09-14 10:56 ` peterz
2020-09-15 2:48 ` Nicholas Piggin
2020-09-15 11:26 ` Michael Ellerman [this message]
2020-09-18 12:18 ` Michael Ellerman
2020-09-14 4:52 ` [PATCH v2 2/4] powerpc: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM Nicholas Piggin
2020-09-14 4:52 ` [PATCH v2 3/4] sparc64: remove mm_cpumask clearing to fix kthread_use_mm race Nicholas Piggin
2020-09-14 7:00 ` Nicholas Piggin
2020-09-14 10:23 ` Anatoly Pugachev
2020-09-15 2:49 ` Nicholas Piggin
2020-09-14 19:59 ` David Miller
2020-09-15 3:24 ` Nicholas Piggin
2020-09-15 19:42 ` David Miller
2020-09-14 4:52 ` [PATCH v2 4/4] powerpc/64s/radix: Fix mm_cpumask trimming race vs kthread_use_mm Nicholas Piggin
2020-09-24 12:28 ` [PATCH v2 0/4] more mm switching vs TLB shootdown and lazy tlb fixes Michael Ellerman
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