linux-kernel - [PATCH] dma-buf: Use atomic64_inc_return() in dma_buf

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Message-ID: <20241007083921.47525-1-ubizjak@gmail.com>
Date: Mon,  7 Oct 2024 10:37:52 +0200
From: Uros Bizjak <ubizjak@...il.com>
To: linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org,
	linux-kernel@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>
Subject: [PATCH] dma-buf: Use atomic64_inc_return() in dma_buf_getfile()

Use atomic64_inc_return(&ref) instead of atomic64_add_return(1, &ref)
to use optimized implementation and ease register pressure around
the primitive for targets that implement optimized variant.

Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: "Christian König" <christian.koenig@....com>
---
 drivers/dma-buf/dma-buf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 8892bc701a66..a3649db76add 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -558,7 +558,7 @@ static struct file *dma_buf_getfile(size_t size, int flags)
 	 * Override ->i_ino with the unique and dmabuffs specific
 	 * value.
 	 */
-	inode->i_ino = atomic64_add_return(1, &dmabuf_inode);
+	inode->i_ino = atomic64_inc_return(&dmabuf_inode);
 	flags &= O_ACCMODE | O_NONBLOCK;
 	file = alloc_file_pseudo(inode, dma_buf_mnt, "dmabuf",
 				 flags, &dma_buf_fops);
-- 
2.46.2