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

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Date:	Tue, 12 Oct 2010 14:33:34 +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

> From: Andi Kleen [mailto:andi@...stfloor.org]
> Sent: 12. lokakuuta 2010 17:30
> To: Penttilä Mika
> Cc: Andi Kleen; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] HWPOISON: Implement hwpoison-on-free for soft
> offlining
> 
> On Tue, Oct 12, 2010 at 02:23:15PM +0000, Penttilä Mika wrote:
> > > >>  		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
> 
> #ifdef CONFIG_HWPOISON_ON_FREE
> PAGEFLAG(HWPoisonOnFree, hwpoison_on_free)
> TESTSCFLAG(HWPoisonOnFree, hwpoison_on_free)
> #define __PG_HWPOISON_ON_FREE (1UL << PG_hwpoison_on_free)
> #else
> PAGEFLAG_FALSE(HWPoisonOnFree)
> SETPAGEFLAG_NOOP(HWPoisonOnFree)
> #define __PG_HWPOISON_ON_FREE 0
> #endif
> 
> ...
> 
> #define PAGE_FLAGS_CHECK_AT_FREE \
>         (1 << PG_lru     | 1 << PG_locked    | \
>          1 << PG_private | 1 << PG_private_2 | \
>          1 << PG_buddy   | 1 << PG_writeback | 1 << PG_reserved | \
>          1 << PG_slab    | 1 << PG_swapcache | 1 << PG_active | \
>          1 << PG_unevictable | __PG_MLOCKED | __PG_HWPOISON | \
>          __PG_HWPOISON_ON_FREE)
> 
> 
> -Andi
> --
> ak@...ux.intel.com -- Speaking for myself only.



Sure, sorry for that, read the patch badly..

--Mika



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