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

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Message-ID: <1374019445.19894.403.camel@pasglop>
Date:	Wed, 17 Jul 2013 10:04:05 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Scott Wood <scottwood@...escale.com>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Neil Horman <nhorman@...driver.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Anton Blanchard <anton@...ba.org>
Subject: Re: [PATCH] module: ppc64 module CRC relocation fix causes perf
 issues

On Tue, 2013-07-16 at 17:40 -0500, Scott Wood wrote:
> On 07/15/2013 03:47:06 AM, Benjamin Herrenschmidt wrote:
> > On Mon, 2013-07-15 at 14:04 +1000, Anton Blanchard wrote:
> > > Module CRCs are implemented as absolute symbols that get resolved by
> > > a linker script. We build an intermediate .o that contains an
> > > unresolved symbol for each CRC. genksysms parses this .o, calculates
> > > the CRCs and writes a linker script that "resolves" the symbols to
> > > the calc
> > 
> > Scott, can somebody from FSL test that on 32-bit and Ack it ?
> > 
> > Thanks !
> > 
> > Cheers,
> > Ben.
> 
> It boots for me on e500mc and I can insert modules.

But does perf work ? :-)

Cheers,
Ben.


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