linux-kernel - Re: [PATCH v3 2/8] mm/debug-pagealloc: prepare boottime configurable on/off

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Date:	Mon, 22 Dec 2014 10:10:42 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Valentin Rothberg <valentinrothberg@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan@...nel.org>, Dave Hansen <dave@...1.net>,
	Michal Nazarewicz <mina86@...a86.com>,
	Jungsoo Son <jungsoo.son@....com>,
	Ingo Molnar <mingo@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/8] mm/debug-pagealloc: prepare boottime
 configurable on/off

Hi Joonsoo,

On Fri, 2014-11-28 at 16:35 +0900, Joonsoo Kim wrote:
> Hello, Paul.
> 
> Thanks for spotting this.
> I attach the patch. :)
> 
> Andrew,
> Could you kindly fold this into the patch in your tree?
> 
> Thanks.
> 
> ------------------->8---------------
> From a33c480160904cc93333807a448960151ac4c534 Mon Sep 17 00:00:00 2001
> From: Joonsoo Kim <iamjoonsoo.kim@....com>
> Date: Fri, 28 Nov 2014 16:05:32 +0900
> Subject: [PATCH] mm/debug_pagealloc: remove obsolete Kconfig options
> 
> These are obsolete since commit "mm/debug-pagealloc: prepare boottime
> configurable" is merged. So, remove it.
> 
> [pebolle@...cali.nl: find obsolete Kconfig options]
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> ---
>  mm/Kconfig.debug |    9 ---------
>  1 file changed, 9 deletions(-)
> 
> diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
> index 56badfc..957d3da 100644
> --- a/mm/Kconfig.debug
> +++ b/mm/Kconfig.debug
> @@ -14,7 +14,6 @@ config DEBUG_PAGEALLOC
>  	depends on !KMEMCHECK
>  	select PAGE_EXTENSION
>  	select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
> -	select PAGE_GUARD if ARCH_SUPPORTS_DEBUG_PAGEALLOC
>  	---help---
>  	  Unmap pages from the kernel linear mapping after free_pages().
>  	  This results in a large slowdown, but helps to find certain types
> @@ -27,13 +26,5 @@ config DEBUG_PAGEALLOC
>  	  that would result in incorrect warnings of memory corruption after
>  	  a resume because free pages are not saved to the suspend image.
>  
> -config WANT_PAGE_DEBUG_FLAGS
> -	bool
> -
>  config PAGE_POISONING
>  	bool
> -	select WANT_PAGE_DEBUG_FLAGS
> -
> -config PAGE_GUARD
> -	bool
> -	select WANT_PAGE_DEBUG_FLAGS

This patch didn't make it into v3.19-rc1. And I think it never entered
linux-next. Did this fall through the cracks or was there some other
issue with this patch?

Thanks,


Paul Bolle

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