linux-kernel - Re: [V4, 2/3] powerpc/opal: Add #define to get rc from an ASYNC_COMP opal

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Message-ID: <20160629103852.17ffdd59@dyn253.ozlabs.ibm.com>
Date:	Wed, 29 Jun 2016 10:38:52 +1000
From:	Suraj Jitindar Singh <sjitindarsingh@...il.com>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	linuxppc-dev@...ts.ozlabs.org, robh@...nel.org, arnd@...db.de,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	paulus@...ba.org
Subject: Re: [V4, 2/3] powerpc/opal: Add #define to get rc from an
 ASYNC_COMP opal_msg

On Tue, 28 Jun 2016 21:58:28 +1000 (AEST)
Michael Ellerman <mpe@...erman.id.au> wrote:

> On Tue, 2016-28-06 at 04:40:56 UTC, Suraj Jitindar Singh wrote:
> > An opal_msg of type OPAL_MSG_ASYNC_COMP contains the return code in
> > the params[1] struct member. However this isn't intuitive or
> > obvious when reading the code and requires that a user look at the
> > skiboot documentation or opal-api.h to verify this.
> > 
> > Add a #define to get the return code from an opal_msg and update
> > call sites accordingly.  
> 
> Thanks for cleaning this up.
> 
> Two gripes though :)
> 
> >  arch/powerpc/include/asm/opal-api.h            | 4 ++++  
> 
> opal-api.h is supposed to be a subset of the skiboot version.
> 
> So something like this should go in the kernel's opal.h, which has
> all the kernel prototypes etc. which aren't part of the OPAL API. I
> think this routine should fall under that.
Will move this
> 
> > diff --git a/arch/powerpc/include/asm/opal-api.h
> > b/arch/powerpc/include/asm/opal-api.h index 9bb8ddf..7433cf0 100644
> > --- a/arch/powerpc/include/asm/opal-api.h
> > +++ b/arch/powerpc/include/asm/opal-api.h
> > @@ -387,6 +387,10 @@ struct opal_msg {
> >  	__be64 params[8];
> >  };
> >  
> > +#define GET_OPAL_MSG_ASYNC_COMP_RC(msg)	(msg.msg_type ==
> > OPAL_MSG_ASYNC_COMP ? \
> > +
> > be64_to_cpu(msg.params[1]) : \
> > +					OPAL_PARAMETER)
> > +  
> 
> You forgot the 7th commandment!
> 
>  "Never use a #define when a static inline would work"
> 
> :)
> 
> A few reasons:
>   - it's less shouty.
>   - you get type checking.
>   - you don't have to wrap lines with \
>     etc.
> 
> cheers
Thanks, will change this