linux-kernel - Re: + mm-remove-dependency-on-config_flatmem-from-online

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Message-ID: <alpine.DEB.2.00.1105161332420.4353@chino.kir.corp.google.com>
Date:	Mon, 16 May 2011 13:34:03 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	linux-kernel@...r.kernel.org
cc:	mm-commits@...r.kernel.org, dkiper@...-space.pl,
	dave@...ux.vnet.ibm.com
Subject: Re: + mm-remove-dependency-on-config_flatmem-from-online_page.patch
 added to -mm tree

On Tue, 3 May 2011, akpm@...ux-foundation.org wrote:

> 
> The patch titled
>      mm: remove dependency on CONFIG_FLATMEM from online_page()
> has been added to the -mm tree.  Its filename is
>      mm-remove-dependency-on-config_flatmem-from-online_page.patch
> 
> Before you just go and hit "reply", please:
>    a) Consider who else should be cc'ed
>    b) Prefer to cc a suitable mailing list as well
>    c) Ideally: find the original patch on the mailing list and do a
>       reply-to-all to that, adding suitable additional cc's
> 
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
> 
> See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
> out what to do about this
> 
> The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
> 
> ------------------------------------------------------
> Subject: mm: remove dependency on CONFIG_FLATMEM from online_page()
> From: Daniel Kiper <dkiper@...-space.pl>
> 
> Memory hotplug code strictly depends on CONFIG_SPARSEMEM.  It means that
> code depending on CONFIG_FLATMEM in online_page() is never compiled. 
> Remove it because it is not needed anymore.
> 

The changelog should read:

	online_pages() is only compiled for CONFIG_MEMORY_HOTPLUG_SPARSE,
	so there is no need to support CONFIG_FLATMEM code within it.

	This patch removes code that is never used.

since this code is dependant on CONFIG_MEMORY_HOTPLUG_SPARSE, not 
CONFIG_SPARSEMEM.

After that:

Acked-by: David Rientjes <rientjes@...gle.com>

> Signed-off-by: Daniel Kiper <dkiper@...-space.pl>
> Acked-by: Dave Hansen <dave@...ux.vnet.ibm.com>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
> 
>  mm/memory_hotplug.c |    4 ----
>  1 file changed, 4 deletions(-)
> 
> diff -puN mm/memory_hotplug.c~mm-remove-dependency-on-config_flatmem-from-online_page mm/memory_hotplug.c
> --- a/mm/memory_hotplug.c~mm-remove-dependency-on-config_flatmem-from-online_page
> +++ a/mm/memory_hotplug.c
> @@ -374,10 +374,6 @@ void online_page(struct page *page)
>  		totalhigh_pages++;
>  #endif
>  
> -#ifdef CONFIG_FLATMEM
> -	max_mapnr = max(pfn, max_mapnr);
> -#endif
> -
>  	ClearPageReserved(page);
>  	init_page_count(page);
>  	__free_page(page);
--
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