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Date: Tue, 24 Apr 2007 15:33:36 +1000 From: Benjamin Herrenschmidt <benh@...nel.crashing.org> To: Andrew Morton <akpm@...ux-foundation.org> CC: <linux-kernel@...r.kernel.org>, Linux Memory Management <linux-mm@...ck.org> Subject: [PATCH 6/12] get_unmapped_area handles MAP_FIXED on ia64 Handle MAP_FIXED in ia64 arch_get_unmapped_area and hugetlb_get_unmapped_area(), just call prepare_hugepage_range in the later and is_hugepage_only_range() in the former. Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org> Acked-by: William Irwin <bill.irwin@...cle.com> arch/ia64/kernel/sys_ia64.c | 7 +++++++ arch/ia64/mm/hugetlbpage.c | 8 ++++++++ 2 files changed, 15 insertions(+) Index: linux-cell/arch/ia64/kernel/sys_ia64.c =================================================================== --- linux-cell.orig/arch/ia64/kernel/sys_ia64.c 2007-03-22 15:10:45.000000000 +1100 +++ linux-cell/arch/ia64/kernel/sys_ia64.c 2007-03-22 15:10:47.000000000 +1100 @@ -33,6 +33,13 @@ arch_get_unmapped_area (struct file *fil if (len > RGN_MAP_LIMIT) return -ENOMEM; + /* handle fixed mapping: prevent overlap with huge pages */ + if (flags & MAP_FIXED) { + if (is_hugepage_only_range(mm, addr, len)) + return -EINVAL; + return addr; + } + #ifdef CONFIG_HUGETLB_PAGE if (REGION_NUMBER(addr) == RGN_HPAGE) addr = 0; Index: linux-cell/arch/ia64/mm/hugetlbpage.c =================================================================== --- linux-cell.orig/arch/ia64/mm/hugetlbpage.c 2007-03-22 15:12:32.000000000 +1100 +++ linux-cell/arch/ia64/mm/hugetlbpage.c 2007-03-22 15:12:39.000000000 +1100 @@ -148,6 +148,14 @@ unsigned long hugetlb_get_unmapped_area( return -ENOMEM; if (len & ~HPAGE_MASK) return -EINVAL; + + /* Handle MAP_FIXED */ + if (flags & MAP_FIXED) { + if (prepare_hugepage_range(addr, len, pgoff)) + return -EINVAL; + return addr; + } + /* This code assumes that RGN_HPAGE != 0. */ if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1))) addr = HPAGE_REGION_BASE; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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