[PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[Peter Enderborg]

This adds a total used dma-buf memory. Details
can be found in debugfs, however it is not for everyone
and not always available.

Signed-off-by: Peter Enderborg <peter.enderborg@sony.com>
---
 drivers/dma-buf/dma-buf.c | 12 ++++++++++++
 fs/proc/meminfo.c         |  2 ++
 include/linux/dma-buf.h   |  1 +
 3 files changed, 15 insertions(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index f264b70c383e..9f88171b394c 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -37,6 +37,7 @@ struct dma_buf_list {
 };
 
 static struct dma_buf_list db_list;
+static atomic_long_t dma_buf_size;
 
 static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen)
 {
@@ -79,6 +80,7 @@ static void dma_buf_release(struct dentry *dentry)
 	if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
 		dma_resv_fini(dmabuf->resv);
 
+	atomic_long_sub(dmabuf->size, &dma_buf_size);
 	module_put(dmabuf->owner);
 	kfree(dmabuf->name);
 	kfree(dmabuf);
@@ -586,6 +588,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
 	mutex_lock(&db_list.lock);
 	list_add(&dmabuf->list_node, &db_list.head);
 	mutex_unlock(&db_list.lock);
+	atomic_long_add(dmabuf->size, &dma_buf_size);
 
 	return dmabuf;
 
@@ -1346,6 +1349,15 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
 }
 EXPORT_SYMBOL_GPL(dma_buf_vunmap);
 
+/**
+ * dma_buf_get_size - Return the used nr pages by dma-buf
+ */
+long dma_buf_get_size(void)
+{
+	return atomic_long_read(&dma_buf_size) >> PAGE_SHIFT;
+}
+EXPORT_SYMBOL_GPL(dma_buf_get_size);
+
 #ifdef CONFIG_DEBUG_FS
 static int dma_buf_debug_show(struct seq_file *s, void *unused)
 {
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 6fa761c9cc78..3c1a82b51a6f 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -16,6 +16,7 @@
 #ifdef CONFIG_CMA
 #include <linux/cma.h>
 #endif
+#include <linux/dma-buf.h>
 #include <asm/page.h>
 #include "internal.h"
 
@@ -145,6 +146,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 	show_val_kb(m, "CmaFree:        ",
 		    global_zone_page_state(NR_FREE_CMA_PAGES));
 #endif
+	show_val_kb(m, "DmaBufTotal:    ", dma_buf_get_size());
 
 	hugetlb_report_meminfo(m);
 
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index efdc56b9d95f..f6481315a377 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -507,4 +507,5 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
 		 unsigned long);
 int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
 void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
+long dma_buf_get_size(void);
 #endif /* __DMA_BUF_H__ */
-- 
2.17.1

[PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[Peter Enderborg]

This adds a total used dma-buf memory. Details
can be found in debugfs, however it is not for everyone
and not always available.

Signed-off-by: Peter Enderborg <peter.enderborg@sony.com>
---
 drivers/dma-buf/dma-buf.c | 12 ++++++++++++
 fs/proc/meminfo.c         |  2 ++
 include/linux/dma-buf.h   |  1 +
 3 files changed, 15 insertions(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index f264b70c383e..9f88171b394c 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -37,6 +37,7 @@ struct dma_buf_list {
 };
 
 static struct dma_buf_list db_list;
+static atomic_long_t dma_buf_size;
 
 static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen)
 {
@@ -79,6 +80,7 @@ static void dma_buf_release(struct dentry *dentry)
 	if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
 		dma_resv_fini(dmabuf->resv);
 
+	atomic_long_sub(dmabuf->size, &dma_buf_size);
 	module_put(dmabuf->owner);
 	kfree(dmabuf->name);
 	kfree(dmabuf);
@@ -586,6 +588,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
 	mutex_lock(&db_list.lock);
 	list_add(&dmabuf->list_node, &db_list.head);
 	mutex_unlock(&db_list.lock);
+	atomic_long_add(dmabuf->size, &dma_buf_size);
 
 	return dmabuf;
 
@@ -1346,6 +1349,15 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
 }
 EXPORT_SYMBOL_GPL(dma_buf_vunmap);
 
+/**
+ * dma_buf_get_size - Return the used nr pages by dma-buf
+ */
+long dma_buf_get_size(void)
+{
+	return atomic_long_read(&dma_buf_size) >> PAGE_SHIFT;
+}
+EXPORT_SYMBOL_GPL(dma_buf_get_size);
+
 #ifdef CONFIG_DEBUG_FS
 static int dma_buf_debug_show(struct seq_file *s, void *unused)
 {
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 6fa761c9cc78..3c1a82b51a6f 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -16,6 +16,7 @@
 #ifdef CONFIG_CMA
 #include <linux/cma.h>
 #endif
+#include <linux/dma-buf.h>
 #include <asm/page.h>
 #include "internal.h"
 
@@ -145,6 +146,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 	show_val_kb(m, "CmaFree:        ",
 		    global_zone_page_state(NR_FREE_CMA_PAGES));
 #endif
+	show_val_kb(m, "DmaBufTotal:    ", dma_buf_get_size());
 
 	hugetlb_report_meminfo(m);
 
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index efdc56b9d95f..f6481315a377 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -507,4 +507,5 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
 		 unsigned long);
 int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
 void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
+long dma_buf_get_size(void);
 #endif /* __DMA_BUF_H__ */
-- 
2.17.1

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https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[Matthew Wilcox]

On Fri, Apr 16, 2021 at 11:37:19AM +0200, Peter Enderborg wrote:
> diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
> index 6fa761c9cc78..3c1a82b51a6f 100644
> --- a/fs/proc/meminfo.c
> +++ b/fs/proc/meminfo.c
> @@ -16,6 +16,7 @@
>  #ifdef CONFIG_CMA
>  #include <linux/cma.h>
>  #endif
> +#include <linux/dma-buf.h>
>  #include <asm/page.h>
>  #include "internal.h"
>  
> @@ -145,6 +146,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
>  	show_val_kb(m, "CmaFree:        ",
>  		    global_zone_page_state(NR_FREE_CMA_PAGES));
>  #endif
> +	show_val_kb(m, "DmaBufTotal:    ", dma_buf_get_size());
>  
>  	hugetlb_report_meminfo(m);
>  

... and if CONFIG_DMA_SHARED_BUFFER is not set ...?

Re: [PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[Matthew Wilcox]

On Fri, Apr 16, 2021 at 11:37:19AM +0200, Peter Enderborg wrote:
> diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
> index 6fa761c9cc78..3c1a82b51a6f 100644
> --- a/fs/proc/meminfo.c
> +++ b/fs/proc/meminfo.c
> @@ -16,6 +16,7 @@
>  #ifdef CONFIG_CMA
>  #include <linux/cma.h>
>  #endif
> +#include <linux/dma-buf.h>
>  #include <asm/page.h>
>  #include "internal.h"
>  
> @@ -145,6 +146,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
>  	show_val_kb(m, "CmaFree:        ",
>  		    global_zone_page_state(NR_FREE_CMA_PAGES));
>  #endif
> +	show_val_kb(m, "DmaBufTotal:    ", dma_buf_get_size());
>  
>  	hugetlb_report_meminfo(m);
>  

... and if CONFIG_DMA_SHARED_BUFFER is not set ...?
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Re: [PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[Christian König]

Am 16.04.21 um 11:37 schrieb Peter Enderborg:
> This adds a total used dma-buf memory. Details
> can be found in debugfs, however it is not for everyone
> and not always available.

Well you are kind of missing the intention here.

I mean knowing this is certainly useful in some case, but you need to 
describe which cases that are.

Christian.

>
> Signed-off-by: Peter Enderborg <peter.enderborg@sony.com>
> ---
>   drivers/dma-buf/dma-buf.c | 12 ++++++++++++
>   fs/proc/meminfo.c         |  2 ++
>   include/linux/dma-buf.h   |  1 +
>   3 files changed, 15 insertions(+)
>
> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> index f264b70c383e..9f88171b394c 100644
> --- a/drivers/dma-buf/dma-buf.c
> +++ b/drivers/dma-buf/dma-buf.c
> @@ -37,6 +37,7 @@ struct dma_buf_list {
>   };
>   
>   static struct dma_buf_list db_list;
> +static atomic_long_t dma_buf_size;
>   
>   static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen)
>   {
> @@ -79,6 +80,7 @@ static void dma_buf_release(struct dentry *dentry)
>   	if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
>   		dma_resv_fini(dmabuf->resv);
>   
> +	atomic_long_sub(dmabuf->size, &dma_buf_size);
>   	module_put(dmabuf->owner);
>   	kfree(dmabuf->name);
>   	kfree(dmabuf);
> @@ -586,6 +588,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
>   	mutex_lock(&db_list.lock);
>   	list_add(&dmabuf->list_node, &db_list.head);
>   	mutex_unlock(&db_list.lock);
> +	atomic_long_add(dmabuf->size, &dma_buf_size);
>   
>   	return dmabuf;
>   
> @@ -1346,6 +1349,15 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
>   }
>   EXPORT_SYMBOL_GPL(dma_buf_vunmap);
>   
> +/**
> + * dma_buf_get_size - Return the used nr pages by dma-buf
> + */
> +long dma_buf_get_size(void)
> +{
> +	return atomic_long_read(&dma_buf_size) >> PAGE_SHIFT;
> +}
> +EXPORT_SYMBOL_GPL(dma_buf_get_size);
> +
>   #ifdef CONFIG_DEBUG_FS
>   static int dma_buf_debug_show(struct seq_file *s, void *unused)
>   {
> diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
> index 6fa761c9cc78..3c1a82b51a6f 100644
> --- a/fs/proc/meminfo.c
> +++ b/fs/proc/meminfo.c
> @@ -16,6 +16,7 @@
>   #ifdef CONFIG_CMA
>   #include <linux/cma.h>
>   #endif
> +#include <linux/dma-buf.h>
>   #include <asm/page.h>
>   #include "internal.h"
>   
> @@ -145,6 +146,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
>   	show_val_kb(m, "CmaFree:        ",
>   		    global_zone_page_state(NR_FREE_CMA_PAGES));
>   #endif
> +	show_val_kb(m, "DmaBufTotal:    ", dma_buf_get_size());
>   
>   	hugetlb_report_meminfo(m);
>   
> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
> index efdc56b9d95f..f6481315a377 100644
> --- a/include/linux/dma-buf.h
> +++ b/include/linux/dma-buf.h
> @@ -507,4 +507,5 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
>   		 unsigned long);
>   int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
>   void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
> +long dma_buf_get_size(void);
>   #endif /* __DMA_BUF_H__ */

Re: [PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[Christian König]

Am 16.04.21 um 11:37 schrieb Peter Enderborg:
> This adds a total used dma-buf memory. Details
> can be found in debugfs, however it is not for everyone
> and not always available.

Well you are kind of missing the intention here.

I mean knowing this is certainly useful in some case, but you need to 
describe which cases that are.

Christian.

>
> Signed-off-by: Peter Enderborg <peter.enderborg@sony.com>
> ---
>   drivers/dma-buf/dma-buf.c | 12 ++++++++++++
>   fs/proc/meminfo.c         |  2 ++
>   include/linux/dma-buf.h   |  1 +
>   3 files changed, 15 insertions(+)
>
> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> index f264b70c383e..9f88171b394c 100644
> --- a/drivers/dma-buf/dma-buf.c
> +++ b/drivers/dma-buf/dma-buf.c
> @@ -37,6 +37,7 @@ struct dma_buf_list {
>   };
>   
>   static struct dma_buf_list db_list;
> +static atomic_long_t dma_buf_size;
>   
>   static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen)
>   {
> @@ -79,6 +80,7 @@ static void dma_buf_release(struct dentry *dentry)
>   	if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
>   		dma_resv_fini(dmabuf->resv);
>   
> +	atomic_long_sub(dmabuf->size, &dma_buf_size);
>   	module_put(dmabuf->owner);
>   	kfree(dmabuf->name);
>   	kfree(dmabuf);
> @@ -586,6 +588,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
>   	mutex_lock(&db_list.lock);
>   	list_add(&dmabuf->list_node, &db_list.head);
>   	mutex_unlock(&db_list.lock);
> +	atomic_long_add(dmabuf->size, &dma_buf_size);
>   
>   	return dmabuf;
>   
> @@ -1346,6 +1349,15 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
>   }
>   EXPORT_SYMBOL_GPL(dma_buf_vunmap);
>   
> +/**
> + * dma_buf_get_size - Return the used nr pages by dma-buf
> + */
> +long dma_buf_get_size(void)
> +{
> +	return atomic_long_read(&dma_buf_size) >> PAGE_SHIFT;
> +}
> +EXPORT_SYMBOL_GPL(dma_buf_get_size);
> +
>   #ifdef CONFIG_DEBUG_FS
>   static int dma_buf_debug_show(struct seq_file *s, void *unused)
>   {
> diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
> index 6fa761c9cc78..3c1a82b51a6f 100644
> --- a/fs/proc/meminfo.c
> +++ b/fs/proc/meminfo.c
> @@ -16,6 +16,7 @@
>   #ifdef CONFIG_CMA
>   #include <linux/cma.h>
>   #endif
> +#include <linux/dma-buf.h>
>   #include <asm/page.h>
>   #include "internal.h"
>   
> @@ -145,6 +146,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
>   	show_val_kb(m, "CmaFree:        ",
>   		    global_zone_page_state(NR_FREE_CMA_PAGES));
>   #endif
> +	show_val_kb(m, "DmaBufTotal:    ", dma_buf_get_size());
>   
>   	hugetlb_report_meminfo(m);
>   
> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
> index efdc56b9d95f..f6481315a377 100644
> --- a/include/linux/dma-buf.h
> +++ b/include/linux/dma-buf.h
> @@ -507,4 +507,5 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
>   		 unsigned long);
>   int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
>   void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
> +long dma_buf_get_size(void);
>   #endif /* __DMA_BUF_H__ */

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Re: [PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 1836 bytes --]

Hi Peter,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on linus/master v5.12-rc7 next-20210415]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Peter-Enderborg/dma-buf-Add-DmaBufTotal-counter-in-meminfo/20210416-174133
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5e46d1b78a03d52306f21f77a4e4a144b6d31486
config: nios2-defconfig (attached as .config)
compiler: nios2-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/0549b4e26c5fc079bdec725b55fc031a5db388c5
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Peter-Enderborg/dma-buf-Add-DmaBufTotal-counter-in-meminfo/20210416-174133
        git checkout 0549b4e26c5fc079bdec725b55fc031a5db388c5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=nios2 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   nios2-linux-ld: fs/proc/meminfo.o: in function `meminfo_proc_show':
>> meminfo.c:(.text+0x3d0): undefined reference to `dma_buf_get_size'
   meminfo.c:(.text+0x3d0): relocation truncated to fit: R_NIOS2_CALL26 against `dma_buf_get_size'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 10667 bytes --]

Re: [PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 1874 bytes --]

Hi Peter,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on linus/master v5.12-rc7 next-20210415]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Peter-Enderborg/dma-buf-Add-DmaBufTotal-counter-in-meminfo/20210416-174133
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5e46d1b78a03d52306f21f77a4e4a144b6d31486
config: nios2-defconfig (attached as .config)
compiler: nios2-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/0549b4e26c5fc079bdec725b55fc031a5db388c5
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Peter-Enderborg/dma-buf-Add-DmaBufTotal-counter-in-meminfo/20210416-174133
        git checkout 0549b4e26c5fc079bdec725b55fc031a5db388c5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=nios2 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   nios2-linux-ld: fs/proc/meminfo.o: in function `meminfo_proc_show':
>> meminfo.c:(.text+0x3d0): undefined reference to `dma_buf_get_size'
   meminfo.c:(.text+0x3d0): relocation truncated to fit: R_NIOS2_CALL26 against `dma_buf_get_size'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

[-- Attachment #2: config.gz --]
[-- Type: application/gzip, Size: 10667 bytes --]

Re: [PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 1810 bytes --]

Hi Peter,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on linus/master v5.12-rc7 next-20210415]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Peter-Enderborg/dma-buf-Add-DmaBufTotal-counter-in-meminfo/20210416-174133
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5e46d1b78a03d52306f21f77a4e4a144b6d31486
config: arc-alldefconfig (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/0549b4e26c5fc079bdec725b55fc031a5db388c5
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Peter-Enderborg/dma-buf-Add-DmaBufTotal-counter-in-meminfo/20210416-174133
        git checkout 0549b4e26c5fc079bdec725b55fc031a5db388c5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arc-elf-ld: fs/proc/meminfo.o: in function `meminfo_proc_show':
   meminfo.c:(.text+0x2b2): undefined reference to `dma_buf_get_size'
>> arc-elf-ld: meminfo.c:(.text+0x2b2): undefined reference to `dma_buf_get_size'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
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Re: [PATCH] dma-buf: Add DmaBufTotal counter in meminfo

[kernel test robot]

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Hi Peter,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on linus/master v5.12-rc7 next-20210415]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Peter-Enderborg/dma-buf-Add-DmaBufTotal-counter-in-meminfo/20210416-174133
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5e46d1b78a03d52306f21f77a4e4a144b6d31486
config: arc-alldefconfig (attached as .config)
compiler: arc-elf-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/0549b4e26c5fc079bdec725b55fc031a5db388c5
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Peter-Enderborg/dma-buf-Add-DmaBufTotal-counter-in-meminfo/20210416-174133
        git checkout 0549b4e26c5fc079bdec725b55fc031a5db388c5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arc 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arc-elf-ld: fs/proc/meminfo.o: in function `meminfo_proc_show':
   meminfo.c:(.text+0x2b2): undefined reference to `dma_buf_get_size'
>> arc-elf-ld: meminfo.c:(.text+0x2b2): undefined reference to `dma_buf_get_size'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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