linux-kernel - [PATCH 06/15] kfifo: pass offset to setup_sgl

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Date: Fri,  5 Apr 2024 08:08:17 +0200
From: "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To: gregkh@...uxfoundation.org
Cc: linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Jiri Slaby (SUSE)" <jirislaby@...nel.org>,
	Stefani Seibold <stefani@...bold.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 06/15] kfifo: pass offset to setup_sgl_buf() instead of a pointer

As a preparatory for dma addresses filling, we need the data offset
instead of virtual pointer in setup_sgl_buf(). So pass the former
instead the latter.

And pointer to fifo is needed in setup_sgl_buf() now too.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
Cc: Stefani Seibold <stefani@...bold.net>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 lib/kfifo.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/lib/kfifo.c b/lib/kfifo.c
index 61e35550aea5..3a249ce4f281 100644
--- a/lib/kfifo.c
+++ b/lib/kfifo.c
@@ -305,9 +305,12 @@ int __kfifo_to_user(struct __kfifo *fifo, void __user *to,
 }
 EXPORT_SYMBOL(__kfifo_to_user);
 
-static unsigned int setup_sgl_buf(struct scatterlist *sgl, void *buf,
-				  int nents, unsigned int len)
+static unsigned int setup_sgl_buf(struct __kfifo *fifo, struct scatterlist *sgl,
+				  unsigned int data_offset, int nents,
+				  unsigned int len)
 {
+	const void *buf = fifo->data + data_offset;
+
 	if (!nents || !len)
 		return 0;
 
@@ -332,8 +335,8 @@ static unsigned int setup_sgl(struct __kfifo *fifo, struct scatterlist *sgl,
 	}
 	len_to_end = min(len, size - off);
 
-	n = setup_sgl_buf(sgl, fifo->data + off, nents, len_to_end);
-	n += setup_sgl_buf(sgl + n, fifo->data, nents - n, len - len_to_end);
+	n = setup_sgl_buf(fifo, sgl, off, nents, len_to_end);
+	n += setup_sgl_buf(fifo, sgl + n, 0, nents - n, len - len_to_end);
 
 	return n;
 }
-- 
2.44.0