| From | Andi Kleen <> | Subject | [PATCH] [17/18] Add huge pud support to mm/memory.c | Date | Mon, 17 Mar 2008 02:58:31 +0100 (CET) |
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mm/memory.c seems to have already gained some knowledge about huge pages: in particularly in get_user_pages. Fix that code up to support huge puds.
Signed-off-by: Andi Kleen <ak@suse.de>
--- mm/memory.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
Index: linux/mm/memory.c =================================================================== --- linux.orig/mm/memory.c +++ linux/mm/memory.c @@ -931,7 +931,13 @@ struct page *follow_page(struct vm_area_ pud = pud_offset(pgd, address); if (pud_none(*pud) || unlikely(pud_bad(*pud))) goto no_page_table; - + + if (pud_huge(*pud)) { + BUG_ON(flags & FOLL_GET); + page = follow_huge_pud(mm, address, pud, flags & FOLL_WRITE); + goto out; + } + pmd = pmd_offset(pud, address); if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd))) goto no_page_table; @@ -1422,6 +1428,8 @@ static int apply_to_pmd_range(struct mm_ unsigned long next; int err; + BUG_ON(pud_huge(*pud)); + pmd = pmd_alloc(mm, pud, addr); if (!pmd) return -ENOMEM;
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