Introduce a helper to report full size of underlying allocation of a
vmalloc'ed address.
Signed-off-by: Yafang Shao <laoar.shao@xxxxxxxxx>
---
include/linux/vmalloc.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 096d48a..52f925f 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -297,4 +297,19 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
static inline bool vmalloc_dump_obj(void *object) { return false; }
#endif
+/* Report full size of underlying allocation of a vmalloc'ed addr */
+static inline size_t vsize(const void *addr)
+{
+ struct vm_struct *area;
+
+ if (!addr)
+ return 0;
+
+ area = find_vm_area(addr);
+ if (unlikely(!area))
+ return 0;
+
+ return area->size;
+}
+
#endif /* _LINUX_VMALLOC_H */
--
1.8.3.1
