linux-kernel - Re: [PATCH] module: ppc64 module CRC relocation fix causes perf issues

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Message-ID: <20130725130212.GA19366@hmsreliant.think-freely.org>
Date:	Thu, 25 Jul 2013 09:02:12 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Anton Blanchard <anton@...ba.org>,
	Scott Wood <scottwood@...escale.com>,
	Paul Mackerras <paulus@...ba.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] module: ppc64 module CRC relocation fix causes perf
 issues

On Thu, Jul 25, 2013 at 09:14:25AM +1000, Benjamin Herrenschmidt wrote:
> On Thu, 2013-07-25 at 08:34 +1000, Anton Blanchard wrote:
> > > Apart from the annoying colors, is there anything specific I should
> > > be looking for?  Some sort of error message, or output that actually
> > > makes sense?
> > 
> > Thanks for testing! Ben, I think the patch is good to go.
> 
> Sent it yesterday to Linus, it's upstream already :-)
> 
> Cheers,
> Ben.
> 
Sorry I'm a bit late to the thread, I've ben swamped.  Has someone tested this
with kexec/kdump?  Thats why the origional patch was created, because when kexec
loads the kernel at a different physical address, the relocations messed with
the module crc's, and modules couldn't load during the kexec boot.  Assuming
that kernaddr_start gets set appropriately during boot, using PHYSICAL_START
should be fine, but I wanted to check, and don't currently have access to a
powerpc system to do so.
Neil

> 
> 
> 
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