2012/9/5 <wency@xxxxxxxxxxxxxx>
>
> From: Wen Congyang <wency@xxxxxxxxxxxxxx>
>
> hwpoisoned may set when we offline a page by the sysfs interface
> /sys/devices/system/memory/soft_offline_page or
> /sys/devices/system/memory/hard_offline_page. If we don't clear
> this flag when onlining pages, this page can't be freed, and will
> not in free list. So we can't offline these pages again. So we
> should clear this flag when onlining pages.
>
> CC: David Rientjes <rientjes@xxxxxxxxxx>
> CC: Jiang Liu <liuj97@xxxxxxxxx>
> CC: Len Brown <len.brown@xxxxxxxxx>
> CC: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> CC: Paul Mackerras <paulus@xxxxxxxxx>
> CC: Christoph Lameter <cl@xxxxxxxxx>
> Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> CC: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
> CC: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
> Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
> ---
> mm/memory_hotplug.c | 5 +++++
> 1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 270c249..140c080 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -661,6 +661,11 @@ EXPORT_SYMBOL_GPL(__online_page_increment_counters);
>
> void __online_page_free(struct page *page)
> {
> +#ifdef CONFIG_MEMORY_FAILURE
> + /* The page may be marked HWPoisoned by soft/hard offline page */
> + ClearPageHWPoison(page);
Hi Congyang,
I think you should decrease mce_bad_pages counter her
atomic_long_sub(1, &mce_bad_pages);
>
> +#endif
> +
> ClearPageReserved(page);
> init_page_count(page);
> __free_page(page);
> --
> 1.7.1
>
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