On Sun, Aug 31, 2014 at 04:33:12PM -0700, Randy Dunlap wrote:

quoted

On 08/31/14 07:48, Randy Dunlap wrote:

quoted

On 08/31/14 04:36, Andrey Ryabinin wrote:

quoted

2014-08-30 5:48 GMT+04:00 Randy Dunlap [off-list ref]:

quoted

From: Randy Dunlap <redacted>

Add header file to fix kmemcheck.c build errors:

../mm/kmemcheck.c:70:7: error: dereferencing pointer to incomplete type
../mm/kmemcheck.c:83:15: error: dereferencing pointer to incomplete type
../mm/kmemcheck.c:95:8: error: dereferencing pointer to incomplete type
../mm/kmemcheck.c:95:21: error: dereferencing pointer to incomplete type

Signed-off-by: Randy Dunlap <redacted>
---
 mm/kmemcheck.c |    1 +
 1 file changed, 1 insertion(+)

Index: mmotm-2014-0829-1515/mm/kmemcheck.c
===================================================================

--- mmotm-2014-0829-1515.orig/mm/kmemcheck.c
+++ mmotm-2014-0829-1515/mm/kmemcheck.c

@@ -2,6 +2,7 @@
 #include <linux/mm_types.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
+#include <linux/slab_def.h>

This will work only for CONFIG_SLAB=y. struct kmem_cache definition
was moved to internal header [*],
so you need to include it here:
#include "slab.h"

[*] http://ozlabs.org/~akpm/mmotm/broken-out/mm-slab_common-move-kmem_cache-definition-to-internal-header.patch

Thanks.  That makes sense.  [testing]  mm/kmemcheck.c still has a build error:

In file included from ../mm/kmemcheck.c:5:0:
../mm/slab.h: In function 'cache_from_obj':
../mm/slab.h:283:2: error: implicit declaration of function 'memcg_kmem_enabled' [-Werror=implicit-function-declaration]

Naughty header file.  It uses something from <linux/memcontrol.h> without
#including that header file...

Hello.

Indeed...
Thanks for catching this.

quoted

Working patch is below.

With your patch, build also failed if CONFIG_MEMCG_KMEM=y.
Right fix is something like below.

Thanks.

--------->8----------

diff --git a/mm/kmemcheck.c b/mm/kmemcheck.c
index fd814fd..cab58bb 100644
--- a/mm/kmemcheck.c
+++ b/mm/kmemcheck.c

@@ -2,6 +2,7 @@
 #include <linux/mm_types.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
+#include "slab.h"
 #include <linux/kmemcheck.h>
 
 void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node)

diff --git a/mm/slab.h b/mm/slab.h
index 13845d0..963a3f8 100644
--- a/mm/slab.h
+++ b/mm/slab.h

@@ -37,6 +37,8 @@ struct kmem_cache {
 #include <linux/slub_def.h>
 #endif
 
+#include <linux/memcontrol.h>
+
 /*
  * State of the slab allocator.
  *
--