linux-kernel - Re: [PATCH 3/3] ia64: Call migration code on correctable errors v2

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Date:	Thu, 1 May 2008 18:22:29 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Russ Anderson <rja@....com>
cc:	linux-kernel@...r.kernel.org, linux-ia64@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 3/3] ia64: Call migration code on correctable errors v2

On Thu, 1 May 2008, Russ Anderson wrote:

> +int
> +freeOneBadPage(unsigned long paddr)
> +{
> +	struct page *page, *page2, *target;
> +
> +	/*
> +	 * Verify page address
> +	 */
> +	target = phys_to_page(paddr);
> +	list_for_each_entry_safe(page, page2, &badpagelist, lru) {
> +		if (page != target)
> +			continue;
> +
> +		ClearPageMemError(page);        /* Mark the page as good */
> +		move_to_lru(page);
> +		list_del(&page->lru);

This is the wrong order. move_to_lru() uses the lru field. So do the 
list_del first then the move. Note that there is a function 
putback_lru_pages() that is used to put a list of pages back to the lru if 
migration has failed and we give up on them. Could you use 
putback_lru_pages() and then avoid the exporting of move_to_lru()?


> +
> +int
> +freeAllBadPages(void)
> +{
> +	struct page *page, *page2;
> +
> +	list_for_each_entry_safe(page, page2, &badpagelist, lru) {
> +		ClearPageMemError(page);        /* Mark the page as good */
> +		totalbad_pages--;
> +	}
> +	putback_lru_pages(&badpagelist);
> +	return 0;
> +}

Ahh.. Here you use it.

> Index: linus/include/asm-ia64/page.h
> ===================================================================
> --- linus.orig/include/asm-ia64/page.h	2008-05-01 19:36:40.000000000 -0500
> +++ linus/include/asm-ia64/page.h	2008-05-01 19:36:49.000000000 -0500
> @@ -122,6 +122,7 @@ extern unsigned long max_low_pfn;
>  #endif
>  
>  #define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
> +#define	phys_to_page(kaddr)	(pfn_to_page(kaddr >> PAGE_SHIFT))

#define phys_to_page virt_to_page ?

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