linux-kernel - linux-next: build failure after merge of the w1 tree

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Date: Thu, 15 Feb 2024 13:29:52 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, Greg KH
 <greg@...ah.com>
Cc: Francesco Dolcini <francesco.dolcini@...adex.com>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Christoph Winklhofer
 <cj.winklhofer@...il.com>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>
Subject: linux-next: build failure after merge of the w1 tree

Hi all,

After merging the w1 tree, today's linux-next build (x86_64 allmodconfig)
failed like this:

drivers/w1/masters/w1-uart.c:314:24: error: initialization of 'size_t (*)(struct serdev_device *, const u8 *, size_t)' {aka 'long unsigned int (*)(struct serdev_device *, const unsigned char *, long unsigned int)'} from incompatible pointer type 'ssize_t (*)(struct serdev_device *, const u8 *, size_t)' {aka 'long int (*)(struct serdev_device *, const unsigned char *, long unsigned int)'} [-Werror=incompatible-pointer-types]
  314 |         .receive_buf = w1_uart_serdev_receive_buf,
      |                        ^~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/w1/masters/w1-uart.c:314:24: note: (near initialization for 'w1_uart_serdev_ops.receive_buf')

Caused by commit

  178cf9db9e6d ("w1: add UART w1 bus driver")

interacting with commit

  fed99212acae ("treewide, serdev: change receive_buf() return type to size_t")

from the tty tree.

I have applied the following merge resolution patch:

From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Thu, 15 Feb 2024 13:23:35 +1100
Subject: [PATCH] fixup for "w1: add UART w1 bus driver"

interacting with "treewide, serdev: change receive_buf() return type to size_t"

Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
 drivers/w1/masters/w1-uart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/w1/masters/w1-uart.c b/drivers/w1/masters/w1-uart.c
index 6950d29d7dac..a31782e56ba7 100644
--- a/drivers/w1/masters/w1-uart.c
+++ b/drivers/w1/masters/w1-uart.c
@@ -289,7 +289,7 @@ static int w1_uart_serdev_tx_rx(struct w1_uart_device *w1dev,
 	return ret;
 }
 
-static ssize_t w1_uart_serdev_receive_buf(struct serdev_device *serdev,
+static size_t w1_uart_serdev_receive_buf(struct serdev_device *serdev,
 					  const u8 *buf, size_t count)
 {
 	struct w1_uart_device *w1dev = serdev_device_get_drvdata(serdev);
-- 
2.43.0

-- 
Cheers,
Stephen Rothwell

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