# Re: \[PATCH 2/2\] mm/page\_ref: add tracepoint to track down page reference manipulation

- From: Sergey Senozhatsky \<hidden\>
- Date: 2016-02-15 05:27:42 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2016/02/4685364
- Thread: https://ratatoskr.run/linux-mm/2016/02/4685299/t.md

```text
On (02/15/16 14:08), Sergey Senozhatsky wrote:
> 
> will this compile with !CONFIG_TRACEPOINTS config?
> 

uh.. sorry, was composed in email client. seems the correct way to do it is

+#if defined CONFIG_DEBUG_PAGE_REF && defined CONFIG_TRACEPOINTS

 #include <linux/tracepoint-defs.h>

 #define page_ref_tracepoint_active(t) static_key_false(&(t).key)

 extern struct tracepoint __tracepoint_page_ref_set;
 ...

 extern void __page_ref_set(struct page *page, int v);
 ...

#else

 #define page_ref_tracepoint_active(t) false

 static inline void __page_ref_set(struct page *page, int v)
 {
 }
 ...

#endif



or add a dependency of PAGE_REF on CONFIG_TRACEPOINTS in Kconfig.

	-ss
```