From: Izik Eidus <ieidus@redhat.com> 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 <ieidus@redhat.com> Subject: [PATCH 2/5] add get_pte(): helper function: fetching pte for va Date: Mon, 20 Apr 2009 04:36:03 +0300 [thread overview] Message-ID: <1240191366-10029-3-git-send-email-ieidus@redhat.com> (raw) In-Reply-To: <1240191366-10029-2-git-send-email-ieidus@redhat.com> 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 <ieidus@redhat.com> --- 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
WARNING: multiple messages have this Message-ID (diff)
From: Izik Eidus <ieidus@redhat.com> 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 <ieidus@redhat.com> Subject: [PATCH 2/5] add get_pte(): helper function: fetching pte for va Date: Mon, 20 Apr 2009 04:36:03 +0300 [thread overview] Message-ID: <1240191366-10029-3-git-send-email-ieidus@redhat.com> (raw) In-Reply-To: <1240191366-10029-2-git-send-email-ieidus@redhat.com> 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 <ieidus@redhat.com> --- 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, 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: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2009-04-20 1:39 UTC|newest] Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top 2009-04-20 1:36 [PATCH 0/5] ksm - dynamic page sharing driver for linux v4 Izik Eidus 2009-04-20 1:36 ` Izik Eidus 2009-04-20 1:36 ` [PATCH 1/5] MMU_NOTIFIERS: add set_pte_at_notify() Izik Eidus 2009-04-20 1:36 ` Izik Eidus 2009-04-20 1:36 ` Izik Eidus [this message] 2009-04-20 1:36 ` [PATCH 2/5] add get_pte(): helper function: fetching pte for va Izik Eidus 2009-04-20 1:36 ` [PATCH 3/5] add page_wrprotect(): write protecting page Izik Eidus 2009-04-20 1:36 ` Izik Eidus 2009-04-20 1:36 ` [PATCH 4/5] add replace_page(): change the page pte is pointing to Izik Eidus 2009-04-20 1:36 ` Izik Eidus 2009-04-20 1:36 ` [PATCH 5/5] add ksm kernel shared memory driver Izik Eidus 2009-04-20 1:36 ` Izik Eidus 2009-04-20 10:02 ` Alan Cox 2009-04-20 10:02 ` Alan Cox 2009-04-20 10:02 ` Alan Cox 2009-04-20 11:11 ` Avi Kivity 2009-04-20 11:11 ` Avi Kivity 2009-04-20 12:52 ` Izik Eidus 2009-04-20 12:52 ` Izik Eidus 2009-04-27 22:34 ` Andrew Morton 2009-04-27 22:34 ` Andrew Morton 2009-04-27 22:34 ` Andrew Morton 2009-04-27 23:12 ` Izik Eidus 2009-04-27 23:12 ` Izik Eidus 2009-04-30 17:46 ` Izik Eidus 2009-04-30 17:46 ` Izik Eidus 2009-04-30 17:58 ` Andrew Morton 2009-04-30 17:58 ` Andrew Morton 2009-05-13 23:17 ` Andrew Morton 2009-05-13 23:17 ` Andrew Morton 2009-05-13 23:17 ` Andrew Morton 2009-05-13 23:25 ` Chris Wright 2009-05-13 23:25 ` Chris Wright 2009-05-14 0:14 ` Anthony Liguori 2009-05-14 0:14 ` Anthony Liguori 2009-05-14 0:11 ` Izik Eidus 2009-05-14 0:11 ` Izik Eidus 2009-05-14 0:15 ` Izik Eidus 2009-05-14 0:15 ` Izik Eidus 2009-05-14 1:40 ` Tony Breeds 2009-05-14 1:40 ` Tony Breeds
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