Add a warning that this UAPI wasn't such a good idea and shouldn't be
used by anybody.

That should give us a better chance to remove it at some point and
prevents others from running into the same issues.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/dma-buf/Kconfig | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig
index 541efe01abc7..e4dc53a36428 100644
--- a/drivers/dma-buf/Kconfig
+++ b/drivers/dma-buf/Kconfig
@@ -75,7 +75,7 @@ menuconfig DMABUF_HEAPS
 	  between drivers.
 
 menuconfig DMABUF_SYSFS_STATS
-	bool "DMA-BUF sysfs statistics"
+	bool "DMA-BUF sysfs statistics (DEPRECATED)"
 	depends on DMA_SHARED_BUFFER
 	help
 	   Choose this option to enable DMA-BUF sysfs statistics
@@ -85,6 +85,10 @@ menuconfig DMABUF_SYSFS_STATS
 	   statistics for the DMA-BUF with the unique inode number
 	   <inode_number>.
 
+	   This option is deprecated and should sooner or later be removed.
+	   Android is the only user of this and it turned out that this resulted
+	   in quite some performance problems.
+
 source "drivers/dma-buf/heaps/Kconfig"
 
 endmenu
-- 
2.25.1

On Fri, Jun 17, 2022 at 1:57 AM Christian König
<ckoenig.leichtzumerken@gmail.com> wrote:
>
> Add a warning that this UAPI wasn't such a good idea and shouldn't be
> used by anybody.
>
> That should give us a better chance to remove it at some point and
> prevents others from running into the same issues.
>
> Signed-off-by: Christian König <christian.koenig@amd.com>
> ---
>  drivers/dma-buf/Kconfig | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig
> index 541efe01abc7..e4dc53a36428 100644
> --- a/drivers/dma-buf/Kconfig
> +++ b/drivers/dma-buf/Kconfig
> @@ -75,7 +75,7 @@ menuconfig DMABUF_HEAPS
>           between drivers.
>
>  menuconfig DMABUF_SYSFS_STATS
> -       bool "DMA-BUF sysfs statistics"
> +       bool "DMA-BUF sysfs statistics (DEPRECATED)"
>         depends on DMA_SHARED_BUFFER
>         help
>            Choose this option to enable DMA-BUF sysfs statistics
> @@ -85,6 +85,10 @@ menuconfig DMABUF_SYSFS_STATS
>            statistics for the DMA-BUF with the unique inode number
>            <inode_number>.
>
> +          This option is deprecated and should sooner or later be removed.
> +          Android is the only user of this and it turned out that this resulted
> +          in quite some performance problems.
> +
>  source "drivers/dma-buf/heaps/Kconfig"
>
>  endmenu
> --
> 2.25.1
>
Reviewed-by: T.J. Mercier <tjmercier@google.com>