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    SubjectRe: [PATCHv2 08/14] mm/page_ext: Drop definition of unused PAGE_EXT_DEBUG_POISON
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    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@linux.intel.com>
    > Cc: Vinayak Menon <vinmenon@codeaurora.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@codeaurora.org>

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