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

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Date:	Tue, 12 Oct 2010 14:23:15 +0000
From:	Penttilä Mika <mika.penttila@...nos.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	"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.
> 
> The optimizer takes care of that.
> 
> >
> >>  		bad_page(page);
> >>  		return 1;
> >>  	}
> >
> > And of course PAGE_FLAGS_CHECK_AT_FREE should include
> > pahehwpoisononfree this to be effective
> 
> It is of course (__PG_HWPOISON_ON_FREE)
> 
Yes but it's not included in PAGE_FLAGS_CHECK_AT_FREE, if  I'm not missing something

--Mika


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