linux-kernel - Re: [PATCH 2/9] slab: makes clear_obj_pfmemalloc() just return store masked value

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Message-ID: <alpine.DEB.2.02.1402141516540.13935@chino.kir.corp.google.com>
Date:	Fri, 14 Feb 2014 15:18:01 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux.com>
cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>
Subject: Re: [PATCH 2/9] slab: makes clear_obj_pfmemalloc() just return store
 masked value

On Fri, 14 Feb 2014, Christoph Lameter wrote:

> > @@ -215,9 +215,9 @@ static inline void set_obj_pfmemalloc(void **objp)
> >  	return;
> >  }
> >
> > -static inline void clear_obj_pfmemalloc(void **objp)
> > +static inline void *clear_obj_pfmemalloc(void *objp)
> >  {
> > -	*objp = (void *)((unsigned long)*objp & ~SLAB_OBJ_PFMEMALLOC);
> > +	return (void *)((unsigned long)objp & ~SLAB_OBJ_PFMEMALLOC);
> >  }
> 
> I dont think you need the (void *) cast here.
> 

Yeah, you don't need it, but don't you think it makes the code more 
readable?  Otherwise this is going to be just doing

	return (unsigned long)objp & ~SLAB_OBJ_PFMEMALLOC;

and you gotta figure out the function type to understand it's returned as 
a pointer.
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