linux-kernel - Re: [PATCHv2 08/14] mm/page_ext: Drop definition of unused PAGE_EXT_DEBUG

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Date:   Thu, 29 Mar 2018 11:02:42 +0530
From:   Vinayak Menon <vinmenon@...eaurora.org>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv2 08/14] mm/page_ext: Drop definition of unused
 PAGE_EXT_DEBUG_POISON

On 3/28/2018 10:25 PM, Kirill A. Shutemov wrote:
> After bd33ef368135 ("mm: enable page poisoning early at boot")
> PAGE_EXT_DEBUG_POISON is not longer used. Remove it.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Vinayak Menon <vinmenon@...eaurora.org>
> ---
>  include/linux/page_ext.h | 11 -----------
>  1 file changed, 11 deletions(-)
>
> diff --git a/include/linux/page_ext.h b/include/linux/page_ext.h
> index ca5461efae2f..bbec618a614b 100644
> --- a/include/linux/page_ext.h
> +++ b/include/linux/page_ext.h
> @@ -16,18 +16,7 @@ struct page_ext_operations {
>  
>  #ifdef CONFIG_PAGE_EXTENSION
>  
> -/*
> - * page_ext->flags bits:
> - *
> - * PAGE_EXT_DEBUG_POISON is set for poisoned pages. This is used to
> - * implement generic debug pagealloc feature. The pages are filled with
> - * poison patterns and set this flag after free_pages(). The poisoned
> - * pages are verified whether the patterns are not corrupted and clear
> - * the flag before alloc_pages().
> - */
> -
>  enum page_ext_flags {
> -	PAGE_EXT_DEBUG_POISON,		/* Page is poisoned */
>  	PAGE_EXT_DEBUG_GUARD,
>  	PAGE_EXT_OWNER,
>  #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)

Reviewed-by: Vinayak Menon <vinmenon@...eaurora.org>