linux-kernel - Re: [ewg] Re: [PATCH 2.6.31] ehca: Tolerate dynamic memory operations and huge pages

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Message-ID: <20090617084151.010562c5@BL3D1974.boeblingen.de.ibm.com>
Date:	Wed, 17 Jun 2009 08:41:51 +0200
From:	Alexander Schmidt <alexs@...ux.vnet.ibm.com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	linuxppc-dev@...abs.org,
	Hoang-Nam Nguyen <hnguyen@...ux.vnet.ibm.com>,
	raisch@...ibm.com, linux-kernel@...r.kernel.org,
	ewg@...ts.openfabrics.org
Subject: Re: [ewg] Re: [PATCH 2.6.31] ehca: Tolerate dynamic memory
 operations and huge pages

On Tue, 16 Jun 2009 09:10:39 -0700
Roland Dreier <rdreier@...co.com> wrote:

> 
>  > Yeah, the notifier code remains untouched as we still do not allow dynamic
>  > memory operations _while_ our module is loaded. The patch allows the driver to
>  > cope with DMEM operations that happened before the module was loaded, which
>  > might result in a non-contiguous memory layout. When the driver registers
>  > its global memory region in the system, the memory layout must be considered.
>  > 
>  > We chose the term "toleration" instead of "support" to illustrate this.
> 
> I see.  So things just silently broke in some cases when the driver was
> loaded after operations you didn't tolerate?
> 
> Anyway, thanks for the explanation.

Well, things did not break silently. The registration of the MR failed with
an error code which was reported to userspace.

Will you push the patch for .31 or .32?

Thanks,
Alex
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