linux-kernel - Re: [PATCH] iommu: replace single-char identifiers in macros

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Date:   Mon, 03 Jun 2019 09:29:31 -0400
From:   Qian Cai <cai@....pw>
To:     Robin Murphy <robin.murphy@....com>, jroedel@...e.de
Cc:     akpm@...ux-foundation.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu: replace single-char identifiers in macros

On Mon, 2019-06-03 at 14:07 +0100, Robin Murphy wrote:
> On 03/06/2019 13:59, Qian Cai wrote:
> > There are a few macros in IOMMU have single-char identifiers make the
> > code hard to read and debug. Replace them with meaningful names.
> > 
> > Suggested-by: Andrew Morton <akpm@...ux-foundation.org>
> > Signed-off-by: Qian Cai <cai@....pw>
> > ---
> >   include/linux/dmar.h | 14 ++++++++------
> >   1 file changed, 8 insertions(+), 6 deletions(-)
> > 
> > diff --git a/include/linux/dmar.h b/include/linux/dmar.h
> > index f8af1d770520..eb634912f475 100644
> > --- a/include/linux/dmar.h
> > +++ b/include/linux/dmar.h
> > @@ -104,12 +104,14 @@ static inline bool dmar_rcu_check(void)
> >   
> >   #define	dmar_rcu_dereference(p)	rcu_dereference_check((p),
> > dmar_rcu_check())
> >   
> > -#define	for_each_dev_scope(a, c, p, d)	\
> > -	for ((p) = 0; ((d) = (p) < (c) ? dmar_rcu_dereference((a)[(p)].dev)
> > : \
> > -			NULL, (p) < (c)); (p)++)
> > -
> > -#define	for_each_active_dev_scope(a, c, p, d)	\
> > -	for_each_dev_scope((a), (c), (p), (d))	if (!(d)) { continue;
> > } else
> > +#define for_each_dev_scope(devs, cnt, i, tmp)				
> > \
> > +	for ((i) = 0; ((tmp) = (i) < (cnt) ?				
> > \
> 
> Given that "tmp" actually appears to be some sort of device cursor, I'm 
> not sure that that naming really achieves the stated goal of clarity :/

"tmp" is used in the callers everywhere though, although I suppose something
like "tmp_dev" can be used if you prefer.