linux-kernel - Re: [PATCH 2/3] mm, compaction: export tracepoints zone names to userspace

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Date:	Mon, 31 Aug 2015 11:13:04 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Ingo Molnar <mingo@...hat.com>, Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 2/3] mm, compaction: export tracepoints zone names to
 userspace

On Mon, 31 Aug 2015 17:02:38 +0200
Vlastimil Babka <vbabka@...e.cz> wrote:


> >> +#define ZONE_TYPE						\
> >> +	IFDEF_ZONE_DMA(		EM (ZONE_DMA,	 "DMA"))	\
> >> +	IFDEF_ZONE_DMA32(	EM (ZONE_DMA32,	 "DMA32"))	\
> >> +				EM (ZONE_NORMAL, "Normal")	\
> >> +	IFDEF_ZONE_HIGHMEM(	EM (ZONE_HIGHMEM,"HighMem"))	\
> >> +				EMe(ZONE_MOVABLE,"Movable")
> >> +
> >
> > Hmm, have you tried to compile this with CONFIG_ZONE_HIGHMEM disabled,
> > and CONFIG_ZONE_DMA and/or CONFIG_ZONE_DMA32 enabled?
> 
> Yep, that's standard x86_64 situation (highmem disabled, dma+dma32 enabled).
> 
> > The EMe() macro must come last, as it doesn't have the ending comma and
> > the __print_symbolic() can fail to compile due to it.
> 
> Thanks to ZONE_MOVABLE being unconditional, EMe(ZONE_MOVABLE...) is 
> always last. Otherwise the macros would get even more ugly...

Ah! My mistake was to see where the end parenthesis of
IFDEF_ZONE_HIGHMEM() laid. It looked to me that it encompassed
ZONE_MOVABLE. But obviously it does not.

-- Steve

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