linux-kernel - Re: [PATCH 1/2] IB/mad: Agent registration is process context only

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Date:   Tue, 12 Jun 2018 14:38:28 -0600
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     hans.westgaard.ry@...cle.com, Doug Ledford <dledford@...hat.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        linux-rdma@...r.kernel.org,
        Håkon Bugge <haakon.bugge@...cle.com>,
        Parav Pandit <parav@...lanox.com>,
        Jack Morgenstein <jackm@....mellanox.co.il>,
        Pravin Shedge <pravin.shedge4linux@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] IB/mad: Agent registration is process context only

On Fri, Jun 08, 2018 at 10:42:17AM -0700, Matthew Wilcox wrote:
> From: Matthew Wilcox <mawilcox@...rosoft.com>
> 
> Document this (it's implicitly true due to sleeping operations already
> in use in both registration and deregistration).  Use this fact to use
> spin_lock_irq instead of spin_lock_irqsave.  This improves performance
> slightly.
> 
> Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
> ---
>  drivers/infiniband/core/mad.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)

In the mean time, this patch is straightfoward, applied to the interm
for-next..

Jason