linux-kernel - Re: [PATCH] HWPOISON: Implement hwpoison-on-free for soft offlining

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Date:	Tue, 12 Oct 2010 12:38:10 +0000
From:	Penttilä Mika <mika.penttila@...nos.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] HWPOISON: Implement hwpoison-on-free for soft offlining

> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -564,6 +564,8 @@ static inline int free_pages_check(struct page *page)
>  		(page->mapping != NULL)  |
>  		(atomic_read(&page->_count) != 0) |
>  		(page->flags & PAGE_FLAGS_CHECK_AT_FREE))) {
> +		if (PageHWPoisonOnFree(page))
> +			hwpoison_page_on_free(page);

hwpoison_page_on_free() seems to be undefined when
CONFIG_HWPOISON_ON_FREE is not defined.

>  		bad_page(page);
>  		return 1;
>  	}

And of course PAGE_FLAGS_CHECK_AT_FREE should include pahehwpoisononfree this to be effective

--Mika


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