From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Date: Tue, 24 Apr 2007 15:33:34 +1000 Subject: [PATCH 1/12] get_unmapped_area handles MAP_FIXED on powerpc In-Reply-To: <1177392813.924664.32930750763.qpush@grosgo> Message-Id: <20070424053336.C23A6DDF06@ozlabs.org> Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: linux-kernel@vger.kernel.org, Linux Memory Management List-ID: Handle MAP_FIXED in powerpc's arch_get_unmapped_area() in all 3 implementations of it. Signed-off-by: Benjamin Herrenschmidt Acked-by: William Irwin arch/powerpc/mm/hugetlbpage.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) Index: linux-cell/arch/powerpc/mm/hugetlbpage.c =================================================================== --- linux-cell.orig/arch/powerpc/mm/hugetlbpage.c 2007-04-24 15:10:17.000000000 +1000 +++ linux-cell/arch/powerpc/mm/hugetlbpage.c 2007-04-24 15:28:11.000000000 +1000 @@ -566,6 +566,13 @@ unsigned long arch_get_unmapped_area(str if (len > TASK_SIZE) 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; + } + if (addr) { addr = PAGE_ALIGN(addr); vma = find_vma(mm, addr); @@ -641,6 +648,13 @@ arch_get_unmapped_area_topdown(struct fi if (len > TASK_SIZE) 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; + } + /* dont allow allocations above current base */ if (mm->free_area_cache > base) mm->free_area_cache = base; @@ -823,6 +837,13 @@ unsigned long hugetlb_get_unmapped_area( /* Paranoia, caller should have dealt with this */ BUG_ON((addr + len) < addr); + /* Handle MAP_FIXED */ + if (flags & MAP_FIXED) { + if (prepare_hugepage_range(addr, len, pgoff)) + return -EINVAL; + return addr; + } + if (test_thread_flag(TIF_32BIT)) { curareas = current->mm->context.low_htlb_areas; -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org