[PATCH] mm: slub: fix format mismatches in slab_err() callers

[PATCH] mm: slub: fix format mismatches in slab_err() callers

[Andrey Ryabinin]

Adding __printf(3, 4) to slab_err exposed following:

mm/slub.c: In function ‘check_slab’:
mm/slub.c:852:4: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 4 has type ‘const char *’ [-Wformat=]
    s->name, page->objects, maxobj);
    ^
mm/slub.c:852:4: warning: too many arguments for format [-Wformat-extra-args]
mm/slub.c:857:4: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 4 has type ‘const char *’ [-Wformat=]
    s->name, page->inuse, page->objects);
    ^
mm/slub.c:857:4: warning: too many arguments for format [-Wformat-extra-args]

mm/slub.c: In function ‘on_freelist’:
mm/slub.c:905:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 5 has type ‘long unsigned int’ [-Wformat=]
    "should be %d", page->objects, max_objects);

Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
---
 mm/slub.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 80c170e..850a94a 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -849,12 +849,12 @@ static int check_slab(struct kmem_cache *s, struct page *page)
 	maxobj = order_objects(compound_order(page), s->size, s->reserved);
 	if (page->objects > maxobj) {
 		slab_err(s, page, "objects %u > max %u",
-			s->name, page->objects, maxobj);
+			page->objects, maxobj);
 		return 0;
 	}
 	if (page->inuse > page->objects) {
 		slab_err(s, page, "inuse %u > max %u",
-			s->name, page->inuse, page->objects);
+			page->inuse, page->objects);
 		return 0;
 	}
 	/* Slab_pad_check fixes things up after itself */
@@ -902,7 +902,7 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
 
 	if (page->objects != max_objects) {
 		slab_err(s, page, "Wrong number of objects. Found %d but "
-			"should be %d", page->objects, max_objects);
+			"should be %ld", page->objects, max_objects);
 		page->objects = max_objects;
 		slab_fix(s, "Number of objects adjusted.");
 	}
-- 
2.1.3

Re: [PATCH] mm: slub: fix format mismatches in slab_err() callers

[Christoph Lameter]

On Wed, 5 Nov 2014, Andrey Ryabinin wrote:

> Adding __printf(3, 4) to slab_err exposed following:

Acked-by: Christoph Lameter <cl@linux.com>

Re: [PATCH] mm: slub: fix format mismatches in slab_err() callers

[David Rientjes]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 2570 bytes --]

On Wed, 5 Nov 2014, Andrey Ryabinin wrote:

> Adding __printf(3, 4) to slab_err exposed following:
> 
> mm/slub.c: In function ‘check_slab’:
> mm/slub.c:852:4: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 4 has type ‘const char *’ [-Wformat=]
>     s->name, page->objects, maxobj);
>     ^
> mm/slub.c:852:4: warning: too many arguments for format [-Wformat-extra-args]
> mm/slub.c:857:4: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 4 has type ‘const char *’ [-Wformat=]
>     s->name, page->inuse, page->objects);
>     ^
> mm/slub.c:857:4: warning: too many arguments for format [-Wformat-extra-args]
> 

Wow, that's an ancient issue, thanks for finding it.

> mm/slub.c: In function ‘on_freelist’:
> mm/slub.c:905:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 5 has type ‘long unsigned int’ [-Wformat=]
>     "should be %d", page->objects, max_objects);
> 
> Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
> Cc: Christoph Lameter <cl@linux.com>
> Cc: Pekka Enberg <penberg@kernel.org>
> Cc: David Rientjes <rientjes@google.com>
> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
> ---
>  mm/slub.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/slub.c b/mm/slub.c
> index 80c170e..850a94a 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -849,12 +849,12 @@ static int check_slab(struct kmem_cache *s, struct page *page)
>  	maxobj = order_objects(compound_order(page), s->size, s->reserved);
>  	if (page->objects > maxobj) {
>  		slab_err(s, page, "objects %u > max %u",
> -			s->name, page->objects, maxobj);
> +			page->objects, maxobj);
>  		return 0;
>  	}
>  	if (page->inuse > page->objects) {
>  		slab_err(s, page, "inuse %u > max %u",
> -			s->name, page->inuse, page->objects);
> +			page->inuse, page->objects);
>  		return 0;
>  	}
>  	/* Slab_pad_check fixes things up after itself */
> @@ -902,7 +902,7 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
>  
>  	if (page->objects != max_objects) {
>  		slab_err(s, page, "Wrong number of objects. Found %d but "
> -			"should be %d", page->objects, max_objects);
> +			"should be %ld", page->objects, max_objects);
>  		page->objects = max_objects;
>  		slab_fix(s, "Number of objects adjusted.");
>  	}

Instead of this hunk, I think that max_objects should be declared as int 
rather than unsigned long since that's what order_objects() returns and it 
is being compared to page->objects which is also int.

[PATCH v2] mm: slub: fix format mismatches in slab_err() callers

[Andrey Ryabinin]

Adding __printf(3, 4) to slab_err exposed following:

mm/slub.c: In function ‘check_slab’:
mm/slub.c:852:4: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 4 has type ‘const char *’ [-Wformat=]
    s->name, page->objects, maxobj);
    ^
mm/slub.c:852:4: warning: too many arguments for format [-Wformat-extra-args]
mm/slub.c:857:4: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 4 has type ‘const char *’ [-Wformat=]
    s->name, page->inuse, page->objects);
    ^
mm/slub.c:857:4: warning: too many arguments for format [-Wformat-extra-args]

mm/slub.c: In function ‘on_freelist’:
mm/slub.c:905:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 5 has type ‘long unsigned int’ [-Wformat=]
    "should be %d", page->objects, max_objects);

Fix first two warnings by removing redundant s->name.
Fix the last by changing type of max_object from unsigned long to int.

Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
---

Changes since v1:
  - To fix the last warning change the type of max_objects instead of changing format string (David)
  - Slightly update changelog

 mm/slub.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 80c170e..ed816f8 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -849,12 +849,12 @@ static int check_slab(struct kmem_cache *s, struct page *page)
 	maxobj = order_objects(compound_order(page), s->size, s->reserved);
 	if (page->objects > maxobj) {
 		slab_err(s, page, "objects %u > max %u",
-			s->name, page->objects, maxobj);
+			page->objects, maxobj);
 		return 0;
 	}
 	if (page->inuse > page->objects) {
 		slab_err(s, page, "inuse %u > max %u",
-			s->name, page->inuse, page->objects);
+			page->inuse, page->objects);
 		return 0;
 	}
 	/* Slab_pad_check fixes things up after itself */
@@ -871,7 +871,7 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
 	int nr = 0;
 	void *fp;
 	void *object = NULL;
-	unsigned long max_objects;
+	int max_objects;
 
 	fp = page->freelist;
 	while (fp && nr <= page->objects) {
-- 
2.1.3

Re: [PATCH v2] mm: slub: fix format mismatches in slab_err() callers

[David Rientjes]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 1335 bytes --]

On Thu, 6 Nov 2014, Andrey Ryabinin wrote:

> Adding __printf(3, 4) to slab_err exposed following:
> 
> mm/slub.c: In function ‘check_slab’:
> mm/slub.c:852:4: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 4 has type ‘const char *’ [-Wformat=]
>     s->name, page->objects, maxobj);
>     ^
> mm/slub.c:852:4: warning: too many arguments for format [-Wformat-extra-args]
> mm/slub.c:857:4: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 4 has type ‘const char *’ [-Wformat=]
>     s->name, page->inuse, page->objects);
>     ^
> mm/slub.c:857:4: warning: too many arguments for format [-Wformat-extra-args]
> 
> mm/slub.c: In function ‘on_freelist’:
> mm/slub.c:905:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 5 has type ‘long unsigned int’ [-Wformat=]
>     "should be %d", page->objects, max_objects);
> 
> Fix first two warnings by removing redundant s->name.
> Fix the last by changing type of max_object from unsigned long to int.
> 
> Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
> Cc: Christoph Lameter <cl@linux.com>
> Cc: Pekka Enberg <penberg@kernel.org>
> Cc: David Rientjes <rientjes@google.com>
> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>

Acked-by: David Rientjes <rientjes@google.com>