linux-kernel - Re: [PATCH 27/62] infiniband/ipath: convert to idr

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Date:	Mon, 4 Feb 2013 08:18:29 -0800
From:	Tejun Heo <tj@...nel.org>
To:	"Marciniszyn, Mike" <mike.marciniszyn@...el.com>
Cc:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"bfields@...ldses.org" <bfields@...ldses.org>,
	"skinsbursky@...allels.com" <skinsbursky@...allels.com>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"axboe@...nel.dk" <axboe@...nel.dk>,
	infinipath <infinipath@...el.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"roland@...nel.org" <roland@...nel.org>
Subject: Re: [PATCH 27/62] infiniband/ipath: convert to idr_alloc()

Hello,

On Mon, Feb 04, 2013 at 04:15:52PM +0000, Marciniszyn, Mike wrote:
> I tried the branch you indicated in the initial patch cover.
> 
> When run with a qib driver, and ipoib ping of another system produces:
...
> Looks like this is tripping during the arp/neighbour path resolution:
> 
> void idr_preload(gfp_t gfp_mask)
> {
>     /*
>      * Consuming preload buffer from non-process context breaks preload
>      * allocation guarantee.  Disallow usage from those contexts.
>      */
>     WARN_ON_ONCE(in_interrupt()); <------------------------
> 
> Any ideas Roland?

Yeah, firewire had the same problem.  It needs to conditionalize
preload() if !__GFP_WAIT (no point anyway).  Will send update patches
soon.

Thanks.

-- 
tejun
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