linux-kernel - Re: [PATCH v4] lib: cpu_rmap: avoid flushing all workqueues

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Message-ID: <50EAC6DA.1040601@mellanox.com>
Date:	Mon, 7 Jan 2013 15:00:10 +0200
From:	Amir Vadai <amirv@...lanox.com>
To:	David Decotigny <decot@...glers.com>
CC:	<linux-kernel@...r.kernel.org>,
	Ben Hutchings <bhutchings@...arflare.com>,
	"David S. Miller" <davem@...emloft.net>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Josh Triplett" <josh@...htriplett.org>,
	David Howells <dhowells@...hat.com>,
	"Paul Gortmaker" <paul.gortmaker@...driver.com>
Subject: Re: [PATCH v4] lib: cpu_rmap: avoid flushing all workqueues

On 02/01/2013 23:52, David Decotigny wrote:
> In some cases, free_irq_cpu_rmap() is called while holding a lock
> (eg. rtnl). This can lead to deadlocks, because it invokes
> flush_scheduled_work() which ends up waiting for whole system
> workqueue to flush, but some pending works might try to acquire the
> lock we are already holding.
>
> This commit uses reference-counting to replace
> irq_run_affinity_notifiers(). It also removes
> irq_run_affinity_notifiers() altogether.
>
> Signed-off-by: David Decotigny<decot@...glers.com>
> ---
>   include/linux/cpu_rmap.h  |   13 +++-------
>   include/linux/interrupt.h |    5 ----
>   lib/cpu_rmap.c            |   63 +++++++++++++++++++++++++++++++++++++++++----
>   3 files changed, 62 insertions(+), 19 deletions(-)
>

Acked-by: Amir Vadai <amirv@...lano.com>
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