Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753991AbZDTBjC (ORCPT ); Sun, 19 Apr 2009 21:39:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753174AbZDTBiH (ORCPT ); Sun, 19 Apr 2009 21:38:07 -0400 Received: from mx2.redhat.com ([66.187.237.31]:45351 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752937AbZDTBiF (ORCPT ); Sun, 19 Apr 2009 21:38:05 -0400 From: Izik Eidus To: akpm@linux-foundation.org Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, avi@redhat.com, aarcange@redhat.com, chrisw@redhat.com, mtosatti@redhat.com, hugh@veritas.com, Izik Eidus Subject: [PATCH 2/5] add get_pte(): helper function: fetching pte for va Date: Mon, 20 Apr 2009 04:36:03 +0300 Message-Id: <1240191366-10029-3-git-send-email-ieidus@redhat.com> In-Reply-To: <1240191366-10029-2-git-send-email-ieidus@redhat.com> References: <1240191366-10029-1-git-send-email-ieidus@redhat.com> <1240191366-10029-2-git-send-email-ieidus@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1423 Lines: 53 get_pte() receive mm_struct of a task, and a virtual address and return the pte corresponding to it. this function return NULL in case it couldnt fetch the pte. Signed-off-by: Izik Eidus --- include/linux/mm.h | 24 ++++++++++++++++++++++++ 1 files changed, 24 insertions(+), 0 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index bff1f0d..9a34109 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -894,6 +894,30 @@ int vma_wants_writenotify(struct vm_area_struct *vma); extern pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, spinlock_t **ptl); +static inline pte_t *get_pte(struct mm_struct *mm, unsigned long addr) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *ptep = NULL; + + pgd = pgd_offset(mm, addr); + if (!pgd_present(*pgd)) + goto out; + + pud = pud_offset(pgd, addr); + if (!pud_present(*pud)) + goto out; + + pmd = pmd_offset(pud, addr); + if (!pmd_present(*pmd)) + goto out; + + ptep = pte_offset_map(pmd, addr); +out: + return ptep; +} + #ifdef __PAGETABLE_PUD_FOLDED static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) -- 1.5.6.5 -- 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/