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From: Andrea Parri <andrea.parri@amarulasolutions.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Oleg Nesterov <oleg@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: [Question] smp_wmb() in prepare_uprobe()
Date: Wed, 21 Nov 2018 23:41:24 +0100	[thread overview]
Message-ID: <20181121224124.GB4016@andrea> (raw)

Hi,

The comment for the smp_wmb() in prepare_uprobe() says:

  "pairs with rmb() in find_active_uprobe()"

but I see no (smp_)rmb() in find_active_uprobe(); I see the smp_rmb() in
handle_swbp(): is this the intended pairing barrier?

Which memory accesses do you want to "order" with this pairing?

Thanks,
  Andrea

             reply	other threads:[~2018-11-21 22:41 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-21 22:41 Andrea Parri [this message]
2018-11-22 12:36 ` [Question] smp_wmb() in prepare_uprobe() Oleg Nesterov
2018-11-22 13:44   ` Andrea Parri
2018-11-22 15:05     ` Oleg Nesterov
2018-11-22 15:45       ` Andrea Parri

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