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From: Andy Lutomirski <luto@kernel.org>
To: x86@kernel.org, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Nicholas Piggin <npiggin@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>, Anton Blanchard <anton@ozlabs.org>,
	Andy Lutomirski <luto@kernel.org>
Subject: [PATCH v3 0/4] membarrier fixes
Date: Thu,  3 Dec 2020 21:07:02 -0800	[thread overview]
Message-ID: <cover.1607058304.git.luto@kernel.org> (raw)

Various membarrier fixes.

Changes from v2:
 - Added reviewed-bys
 - Don't rseq_preempt the caller (Mathieu)
 - Fix single-thread short circuit (Mathieu)

Changes from v1:
 - patch 1: comment fixes from Mathieu
 - patch 2: improved comments
 - patch 3: split out as a separate patch
 - patch 4: now has a proper explanation

Mathieu, I think we have to make sync_core sync the caller.  See patch 4.

Andy Lutomirski (4):
  x86/membarrier: Get rid of a dubious optimization
  membarrier: Add an actual barrier before rseq_preempt()
  membarrier: Explicitly sync remote cores when SYNC_CORE is requested
  membarrier: Execute SYNC_CORE on the calling thread

 arch/x86/include/asm/sync_core.h |  9 ++--
 arch/x86/mm/tlb.c                | 10 ++++-
 kernel/sched/membarrier.c        | 77 ++++++++++++++++++++++++--------
 3 files changed, 72 insertions(+), 24 deletions(-)

-- 
2.28.0


             reply	other threads:[~2020-12-04  5:07 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-04  5:07 Andy Lutomirski [this message]
2020-12-04  5:07 ` [PATCH v3 1/4] x86/membarrier: Get rid of a dubious optimization Andy Lutomirski
2020-12-09  4:10   ` Andy Lutomirski
2020-12-09  8:42   ` [tip: x86/urgent] " tip-bot2 for Andy Lutomirski
2020-12-04  5:07 ` [PATCH v3 2/4] membarrier: Add an actual barrier before rseq_preempt() Andy Lutomirski
2020-12-09  4:12   ` Andy Lutomirski
2020-12-09  8:42   ` [tip: x86/urgent] " tip-bot2 for Andy Lutomirski
2020-12-14 18:05     ` Andy Lutomirski
2020-12-04  5:07 ` [PATCH v3 3/4] membarrier: Explicitly sync remote cores when SYNC_CORE is requested Andy Lutomirski
2020-12-09  4:13   ` Andy Lutomirski
2020-12-09  8:42   ` [tip: x86/urgent] " tip-bot2 for Andy Lutomirski
2020-12-04  5:07 ` [PATCH v3 4/4] membarrier: Execute SYNC_CORE on the calling thread Andy Lutomirski
2020-12-04 19:35   ` Mathieu Desnoyers
2020-12-09  4:15   ` Andy Lutomirski
2020-12-09  8:42   ` [tip: x86/urgent] " tip-bot2 for Andy Lutomirski

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