Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267259AbUI0TR1 (ORCPT ); Mon, 27 Sep 2004 15:17:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267283AbUI0TQJ (ORCPT ); Mon, 27 Sep 2004 15:16:09 -0400 Received: from omx2-ext.sgi.com ([192.48.171.19]:64182 "EHLO omx2.sgi.com") by vger.kernel.org with ESMTP id S267259AbUI0TNk (ORCPT ); Mon, 27 Sep 2004 15:13:40 -0400 Date: Mon, 27 Sep 2004 12:13:03 -0700 (PDT) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: akpm@osdl.org cc: Andy Lutomirski , ak@suse.de, nickpiggin@yahoo.com.au, linux-kernel@vger.kernel.org Subject: page fault scalability patch V9: [7/7] atomic pte operatiosn for s390 In-Reply-To: Message-ID: References: <20040920205752.GH4242@wotan.suse.de> <200409211841.25507.vda@port.imtp.ilyichevsk.odessa.ua> <20040921154542.GB12132@wotan.suse.de> <41527885.8020402@myrealbox.com> <20040923090345.GA6146@wotan.suse.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2127 Lines: 69 Changelog * Provide atomic pte operations for s390 Signed-off-by: Christoph Lameter Index: linus/include/asm-s390/pgtable.h =================================================================== --- linus.orig/include/asm-s390/pgtable.h 2004-09-18 14:25:23.000000000 -0700 +++ linus/include/asm-s390/pgtable.h 2004-09-18 14:47:30.000000000 -0700 @@ -783,6 +783,19 @@ #define kern_addr_valid(addr) (1) +/* Atomic PTE operations */ +#define __HAVE_ARCH_ATOMIC_TABLE_OPS + +static inline pte_t ptep_xchg(struct mm_struct *mm, unsigned long address, pte_t *ptep, pte_t pteval) +{ + return __pte(xchg(ptep, pte_val(pteval))); +} + +static inline int ptep_cmpxchg (struct mm_struct *mm, unsigned long address, pte_t *ptep, pte_t oldval, pte_t newval) +{ + return cmpxchg(ptep, pte_val(oldval), pte_val(newval)) == pte_val(oldval); +} + /* * No page table caches to initialise */ Index: linus/include/asm-s390/pgalloc.h =================================================================== --- linus.orig/include/asm-s390/pgalloc.h 2004-09-18 14:25:23.000000000 -0700 +++ linus/include/asm-s390/pgalloc.h 2004-09-18 14:47:30.000000000 -0700 @@ -97,6 +97,10 @@ pgd_val(*pgd) = _PGD_ENTRY | __pa(pmd); } +static inline int pgd_test_and_populate(struct mm_struct *mm, pdg_t *pgd, pmd_t *pmd) +{ + return cmpxchg(pgd, _PAGE_TABLE_INV, _PGD_ENTRY | __pa(pmd)) == _PAGE_TABLE_INV; +} #endif /* __s390x__ */ static inline void @@ -119,6 +123,18 @@ pmd_populate_kernel(mm, pmd, (pte_t *)((page-mem_map) << PAGE_SHIFT)); } +static inline int +pmd_test_and_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page) +{ + int rc; + spin_lock(&mm->page_table_lock); + + rc=pte_same(*pmd, _PAGE_INVALID_EMPTY); + if (rc) pmd_populate(mm, pmd, page); + spin_unlock(&mm->page_table_lock); + return rc; +} + /* * page table entry allocation/free routines. */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/