linux-kernel - [PATCH] dma-buf: deprecate DMABUF_SYSFS

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Message-Id: <20220617085702.4298-1-christian.koenig@amd.com>
Date:   Fri, 17 Jun 2022 10:57:02 +0200
From:   "Christian König" 
        <ckoenig.leichtzumerken@...il.com>
To:     linux-kernel@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        kernel-team@...roid.com
Cc:     tjmercier@...gle.com, daniel.vetter@...ll.ch, gregkh@...gle.com,
        sumit.semwal@...aro.org,
        Christian König <christian.koenig@....com>
Subject: [PATCH] dma-buf: deprecate DMABUF_SYSFS_STATS

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@....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