From 158f0b5575bfa56eae522ff3b952b791f9d64421 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Fri, 17 Jun 2022 10:35:25 +0200
Subject: dma-buf: deprecate DMABUF_SYSFS_STATS
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Git-commit: e0a9f1fe206a66c3507ff8b7da56f9d1d1dbb9c4
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849

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>
Reviewed-by: T.J. Mercier <tjmercier@google.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220617085702.4298-1-christian.koenig@amd.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 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
-- 
2.38.1