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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org, aneesh.kumar@linux.vnet.ibm.com
Subject: Re: [PATCH 3/6] powerpc/mm: Ensure cpumask update is ordered
Date: Tue, 25 Jul 2017 06:54:06 +1000	[thread overview]
Message-ID: <1500929646.10674.82.camel@kernel.crashing.org> (raw)
In-Reply-To: <20170724212007.7f472332@roar.ozlabs.ibm.com>

On Mon, 2017-07-24 at 21:20 +1000, Nicholas Piggin wrote:
> I think this is the right thing to do, but it should be commented.
> Is hwsync the right barrier? (i.e., it will order the page table walk)

This is an open question, I've asked the architects and HW guys and
waiting for an answer.

That said, are we really trying to order the page table walk or are
we trying to order any (speculative or not) load/store that may trigger
a page table update ?

Cheers,
Ben.

  reply	other threads:[~2017-07-24 20:54 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-24  4:27 [PATCH 1/6] powerpc/mm: Move pgdir setting into a helper Benjamin Herrenschmidt
2017-07-24  4:27 ` [PATCH 2/6] powerpc/mm: Avoid double irq save/restore in activate_mm Benjamin Herrenschmidt
2017-07-24  4:28 ` [PATCH 3/6] powerpc/mm: Ensure cpumask update is ordered Benjamin Herrenschmidt
2017-07-24 11:20   ` Nicholas Piggin
2017-07-24 20:54     ` Benjamin Herrenschmidt [this message]
2017-08-11 11:06     ` Nicholas Piggin
2017-08-11 22:40       ` Benjamin Herrenschmidt
2017-08-17 12:58       ` Michael Ellerman
2017-08-23 12:01   ` [3/6] " Michael Ellerman
2017-07-24  4:28 ` [PATCH 4/6] powerpc/mm: Use mm_is_thread_local() instread of open-coding Benjamin Herrenschmidt
2017-07-24  4:28 ` [PATCH 5/6] powerpc/mm: Optimize detection of thread local mm's Benjamin Herrenschmidt
2017-07-24 11:25   ` Nicholas Piggin
2017-07-24 13:46     ` Michael Ellerman
2017-07-25  0:34       ` Nicholas Piggin
2017-07-25 12:00         ` Michael Ellerman
2017-07-24 20:58     ` Benjamin Herrenschmidt
2017-07-25  0:44       ` Nicholas Piggin
2017-07-25  1:03         ` Benjamin Herrenschmidt
2017-07-25 10:55           ` Nicholas Piggin
2017-08-04 12:06   ` Frederic Barrat
2017-08-04 12:58     ` Benjamin Herrenschmidt
2017-08-21 17:27   ` Frederic Barrat
2017-08-21 17:35     ` Benjamin Herrenschmidt
2017-08-22 13:18       ` Frederic Barrat
2017-08-22 16:55         ` Benjamin Herrenschmidt
2017-08-24 16:40       ` Frederic Barrat
2017-08-24 18:47         ` Benjamin Herrenschmidt
2017-08-25  4:53           ` Frederic Barrat
2017-08-25  7:44             ` Benjamin Herrenschmidt
2017-08-25  8:03               ` Frederic Barrat
2017-08-22  4:28     ` Michael Ellerman
2017-07-24  4:28 ` [PATCH 6/6] powerpc/mm: Make switch_mm_irqs_off() out of line Benjamin Herrenschmidt
2017-08-24 12:37 ` [1/6] powerpc/mm: Move pgdir setting into a helper Michael Ellerman

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