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From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	linuxppc-dev@lists.ozlabs.org
Cc: aneesh.kumar@linux.vnet.ibm.com, npiggin@gmail.com
Subject: Re: [3/6] powerpc/mm: Ensure cpumask update is ordered
Date: Wed, 23 Aug 2017 22:01:52 +1000 (AEST)	[thread overview]
Message-ID: <3xcmHh2ZQZz9sCZ@ozlabs.org> (raw)
In-Reply-To: <20170724042803.25848-3-benh@kernel.crashing.org>

On Mon, 2017-07-24 at 04:28:00 UTC, Benjamin Herrenschmidt wrote:
> There is no guarantee that the various isync's involved with
> the context switch will order the update of the CPU mask with
> the first TLB entry for the new context being loaded by the HW.
> 
> Be safe here and add a memory barrier to order any subsequent
> load/store which may bring entries into the TLB.
> 
> The corresponding barrier on the other side already exists as
> pte updates use pte_xchg() which uses __cmpxchg_u64 which has
> a sync after the atomic operation.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/1a92a80ad386a1a6e3b36d576d52a1

cheers

  parent reply	other threads:[~2017-08-23 12:01 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
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   ` Michael Ellerman [this message]
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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