linux-kernel - Re: [PATCH 04/18] [PATCH] BLOCK: Separate the bounce buffering code from the highmem code [try #4]

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Date:	Fri, 25 Aug 2006 22:04:55 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	David Howells <dhowells@...hat.com>
Cc:	axboe@...nel.dk, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/18] [PATCH] BLOCK: Separate the bounce buffering code from the highmem code [try #4]

On Fri, Aug 25, 2006 at 08:37:07PM +0100, David Howells wrote:
> From: David Howells <dhowells@...hat.com>
> 
> Move the bounce buffer code from mm/highmem.c to mm/bounce.c so that it can be
> more easily disabled when the block layer is disabled.
> 
> !!!NOTE!!! There may be a bug in this code: Should init_emergency_pool() be
> 	   contingent on CONFIG_HIGHMEM?
> 
> Signed-Off-By: David Howells <dhowells@...hat.com>
> ---
> 
>  mm/Makefile  |    4 +
>  mm/bounce.c  |  302 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  mm/highmem.c |  281 ------------------------------------------------------
>  3 files changed, 305 insertions(+), 282 deletions(-)
> 
> diff --git a/mm/Makefile b/mm/Makefile
> index 9dd824c..63637f0 100644
> --- a/mm/Makefile
> +++ b/mm/Makefile
> @@ -12,6 +12,9 @@ obj-y			:= bootmem.o filemap.o mempool.o
>  			   readahead.o swap.o truncate.o vmscan.o \
>  			   prio_tree.o util.o mmzone.o vmstat.o $(mmu-y)
>  
> +ifeq ($(CONFIG_MMU),y)
> +obj-y			+= bounce.o
> +endif

CONFIG_MMU is a bool so you can do this much more elegant:
obj-$(CONFIG_MMU) += bounce.o


	Sam
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