Change 315103 by devtools@devtools_gitimport on 2011/11/10 18:21:16

	commit 7bf07f3d4b4358aa6d99a26d7a0165f1e91c3fcc
	Author: Adam Litke <agl@us.ibm.com>
	Date:   Sat Sep 3 15:55:00 2005 -0700
	
	    [PATCH] hugetlb: move stale pte check into huge_pte_alloc()
	
	    Initial Post (Wed, 17 Aug 2005)
	
	    This patch moves the
	    	if (! pte_none(*pte))
	    		hugetlb_clean_stale_pgtable(pte);
	    logic into huge_pte_alloc() so all of its callers can be immune to the bug
	    described by Kenneth Chen at http://lkml.org/lkml/2004/6/16/246
	
	    > It turns out there is a bug in hugetlb_prefault(): with 3 level page table,
	    > huge_pte_alloc() might return a pmd that points to a PTE page. It happens
	    > if the virtual address for hugetlb mmap is recycled from previously used
	    > normal page mmap. free_pgtables() might not scrub the pmd entry on
	    > munmap and hugetlb_prefault skips on any pmd presence regardless what type
	    > it is.
	
	    Unless I am missing something, it seems more correct to place the check inside
	    huge_pte_alloc() to prevent a the same bug wherever a huge pte is allocated.
	    It also allows checking for this condition when lazily faulting huge pages
	    later in the series.
	
	    Signed-off-by: Adam Litke <agl@us.ibm.com>
	    Cc: <linux-mm@kvack.org>
	    Signed-off-by: Andrew Morton <akpm@osdl.org>
	    Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Affected files ...

... //sw/components_third_party/linux/git/master/.versions.submit#1694 edit
... //sw/components_third_party/linux/git/master/component/arch/i386/mm/hugetlbpage.c#4 edit
... //sw/components_third_party/linux/git/master/component/mm/hugetlb.c#4 edit

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