linux-kernel - Re: [PATCH] pseries/le: Fix another endiannes issue in RTAS call from xmon

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Message-ID: <1421360377.23332.1.camel@ellerman.id.au>
Date:	Fri, 16 Jan 2015 09:19:37 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
Cc:	Laurent Dufour <ldufour@...ux.vnet.ibm.com>, paulus@...ba.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pseries/le: Fix another endiannes issue in RTAS call
 from xmon

On Thu, 2015-01-15 at 11:44 -0800, Tyrel Datwyler wrote:
> On 01/15/2015 09:23 AM, Laurent Dufour wrote:
> > The commit 3b8a3c010969 ("powerpc/pseries: Fix endiannes issue in RTAS
> > call from xmon") was fixing an endianness issue in the call made from
> > xmon to RTAS.
> > 
> > However, as Michael Ellerman noticed, this fix was not complete, the
> > token value was not byte swapped. This lead to call an unexpected and
> > most of the time unexisting RTAS function, which is silently ignored
> > by RTAS.
> 
> Nit. Not so much that is silently ignored by RTAS as much as
> disable_surveillance silently doesn't check the return status of the
> RTAS call. Maybe a check is warranted and reporting of non-success.

Yeah you're right, I added a printf of the result and got -3, which is also
wrong as far as I can tell, but I didn't have the energy to chase it any
further.

Because this is in xmon we want to be extra careful about what we do, but an
xmon_printf() should be safe. I'll do that as a cleanup after this.

cheers



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