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Subject[PATCH v3 1/9] Uprobe: Export vaddr <-> offset conversion functions
Date
From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>

These are generic functions which operates on file offset
and virtual address. Make these functions available outside
of uprobe code so that other can use it as well.

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Reviewed-by: Jérôme Glisse <jglisse@redhat.com>
---
include/linux/mm.h | 12 ++++++++++++
kernel/events/uprobes.c | 10 ----------
2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ccac106..de0cc08 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2272,6 +2272,18 @@ struct vm_unmapped_area_info {
return unmapped_area(info);
}

+static inline unsigned long
+offset_to_vaddr(struct vm_area_struct *vma, loff_t offset)
+{
+ return vma->vm_start + offset - ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
+}
+
+static inline loff_t
+vaddr_to_offset(struct vm_area_struct *vma, unsigned long vaddr)
+{
+ return ((loff_t)vma->vm_pgoff << PAGE_SHIFT) + (vaddr - vma->vm_start);
+}
+
/* truncate.c */
extern void truncate_inode_pages(struct address_space *, loff_t);
extern void truncate_inode_pages_range(struct address_space *,
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index ce6848e..bd6f230 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -130,16 +130,6 @@ static bool valid_vma(struct vm_area_struct *vma, bool is_register)
return vma->vm_file && (vma->vm_flags & flags) == VM_MAYEXEC;
}

-static unsigned long offset_to_vaddr(struct vm_area_struct *vma, loff_t offset)
-{
- return vma->vm_start + offset - ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
-}
-
-static loff_t vaddr_to_offset(struct vm_area_struct *vma, unsigned long vaddr)
-{
- return ((loff_t)vma->vm_pgoff << PAGE_SHIFT) + (vaddr - vma->vm_start);
-}
-
/**
* __replace_page - replace page in vma by new page.
* based on replace_page in mm/ksm.c
--
1.8.3.1
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