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From:   Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
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        Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Subject: [PATCH v2 1/9] Uprobe: Export vaddr <-> offset conversion functions
Date:   Wed,  4 Apr 2018 14:01:02 +0530
In-Reply-To: <20180404083110.18647-1-ravi.bangoria@linux.vnet.ibm.com>
References: <20180404083110.18647-1-ravi.bangoria@linux.vnet.ibm.com>
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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.vnet.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 ad06d42..95909f2 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2274,6 +2274,18 @@ 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