From patchwork Tue Sep 15 06:43:10 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gibson X-Patchwork-Id: 33626 Return-Path: X-Original-To: patchwork-incoming@bilbo.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from ozlabs.org (ozlabs.org [203.10.76.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mx.ozlabs.org", Issuer "CA Cert Signing Authority" (verified OK)) by bilbo.ozlabs.org (Postfix) with ESMTPS id D8F73B7BD4 for ; Tue, 15 Sep 2009 16:44:14 +1000 (EST) Received: by ozlabs.org (Postfix) id CCD99DDD0B; Tue, 15 Sep 2009 16:44:14 +1000 (EST) Delivered-To: patchwork-incoming@ozlabs.org Received: from bilbo.ozlabs.org (bilbo.ozlabs.org [203.10.76.25]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "bilbo.ozlabs.org", Issuer "CAcert Class 3 Root" (verified OK)) by ozlabs.org (Postfix) with ESMTPS id C76D2DDD04 for ; Tue, 15 Sep 2009 16:44:14 +1000 (EST) Received: from bilbo.ozlabs.org (localhost [127.0.0.1]) by bilbo.ozlabs.org (Postfix) with ESMTP id DE776B82B7 for ; Tue, 15 Sep 2009 16:43:31 +1000 (EST) Received: from ozlabs.org (ozlabs.org [203.10.76.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mx.ozlabs.org", Issuer "CA Cert Signing Authority" (verified OK)) by bilbo.ozlabs.org (Postfix) with ESMTPS id 3C244B7B85 for ; Tue, 15 Sep 2009 16:43:11 +1000 (EST) Received: by ozlabs.org (Postfix) id 060B0DDD01; Tue, 15 Sep 2009 16:43:11 +1000 (EST) Delivered-To: linuxppc-dev@ozlabs.org Received: from bilbo.ozlabs.org (bilbo.ozlabs.org [203.10.76.25]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "bilbo.ozlabs.org", Issuer "CAcert Class 3 Root" (verified OK)) by ozlabs.org (Postfix) with ESMTPS id 02EF8DDD0C for ; Tue, 15 Sep 2009 16:43:11 +1000 (EST) Received: by bilbo.ozlabs.org (Postfix, from userid 1007) id E2348B7B6B; Tue, 15 Sep 2009 16:43:10 +1000 (EST) To: , Benjamin Herrenschmidt From: David Gibson Subject: [1/5] Make hpte_need_flush() correctly mask for multiple page sizes In-Reply-To: <20090915064133.GA11621@yookeroo.seuss> Message-Id: <20090915064310.E2348B7B6B@bilbo.ozlabs.org> Date: Tue, 15 Sep 2009 16:43:10 +1000 (EST) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Currently, hpte_need_flush() only correctly flushes the given address for normal pages. Callers for hugepages are required to mask the address themselves. But hpte_need_flush() already looks up the page sizes for its own reasons, so this is a rather silly imposition on the callers. This patch alters it to mask based on the pagesize it has looked up itself, and removes the awkward masking code in the hugepage caller. Signed-off-by: David Gibson --- arch/powerpc/mm/hugetlbpage.c | 6 +----- arch/powerpc/mm/tlb_hash64.c | 8 +++----- 2 files changed, 4 insertions(+), 10 deletions(-) Index: working-2.6/arch/powerpc/mm/tlb_hash64.c =================================================================== --- working-2.6.orig/arch/powerpc/mm/tlb_hash64.c 2009-09-04 14:35:30.000000000 +1000 +++ working-2.6/arch/powerpc/mm/tlb_hash64.c 2009-09-04 14:36:12.000000000 +1000 @@ -53,11 +53,6 @@ void hpte_need_flush(struct mm_struct *m i = batch->index; - /* We mask the address for the base page size. Huge pages will - * have applied their own masking already - */ - addr &= PAGE_MASK; - /* Get page size (maybe move back to caller). * * NOTE: when using special 64K mappings in 4K environment like @@ -75,6 +70,9 @@ void hpte_need_flush(struct mm_struct *m } else psize = pte_pagesize_index(mm, addr, pte); + /* Mask the address for the correct page size */ + addr &= ~((1UL << mmu_psize_defs[psize].shift) - 1); + /* Build full vaddr */ if (!is_kernel_addr(addr)) { ssize = user_segment_size(addr); Index: working-2.6/arch/powerpc/mm/hugetlbpage.c =================================================================== --- working-2.6.orig/arch/powerpc/mm/hugetlbpage.c 2009-09-04 14:35:30.000000000 +1000 +++ working-2.6/arch/powerpc/mm/hugetlbpage.c 2009-09-04 14:36:12.000000000 +1000 @@ -445,11 +445,7 @@ void set_huge_pte_at(struct mm_struct *m * necessary anymore if we make hpte_need_flush() get the * page size from the slices */ - unsigned int psize = get_slice_psize(mm, addr); - unsigned int shift = mmu_psize_to_shift(psize); - unsigned long sz = ((1UL) << shift); - struct hstate *hstate = size_to_hstate(sz); - pte_update(mm, addr & hstate->mask, ptep, ~0UL, 1); + pte_update(mm, addr, ptep, ~0UL, 1); } *ptep = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS); }