The patch titled
ksm: add get_pte(): helper function: fetching pte for va
has been added to the -mm tree. Its filename is
ksm-add-get_pte-helper-function-fetching-pte-for-va.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: ksm: add get_pte(): helper function: fetching pte for va
From: Izik Eidus <ieidus@xxxxxxxxxx>
get_pte() receives the mm_struct of a task and a virtual address and
returns the pte corresponding to it.
This function return NULL in case it couldnt fetch the pte.
Signed-off-by: Izik Eidus <ieidus@xxxxxxxxxx>
Cc: Chris Wright <chrisw@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Avi Kivity <avi@xxxxxxxxxx>
Cc: Hugh Dickins <hugh@xxxxxxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff -puN include/linux/mm.h~ksm-add-get_pte-helper-function-fetching-pte-for-va include/linux/mm.h
--- a/include/linux/mm.h~ksm-add-get_pte-helper-function-fetching-pte-for-va
+++ a/include/linux/mm.h
@@ -884,6 +884,30 @@ int vma_wants_writenotify(struct vm_area
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)
_
Patches currently in -mm which might be from ieidus@xxxxxxxxxx are
linux-next.patch
ksm-mmu_notifiers-add-set_pte_at_notify.patch
ksm-add-get_pte-helper-function-fetching-pte-for-va.patch
ksm-add-page_wrprotect-write-protecting-page.patch
ksm-add-replace_page-change-the-page-pte-is-pointing-to.patch
ksm-add-ksm-kernel-shared-memory-driver.patch
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