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

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Date: Thu, 15 Feb 2024 14:54:53 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Greg KH <greg@...ah.com>, Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Francesco Dolcini <francesco.dolcini@...adex.com>,
 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: Re: linux-next: build failure after merge of the w1 tree

On 15/02/2024 09:05, Greg KH wrote:
> On Thu, Feb 15, 2024 at 01:29:52PM +1100, Stephen Rothwell wrote:
>> 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);
> 
> Looks good to me.
> 
> Krzysztof, want to pull in the w1 changes to my tty tree and make this
> change on top of it so that everything works properly going forward?

Sure, I will base my branch on top of your tty-next. Currently the HEAD
is: 6cc3028f797a ("tty: vt: decrypt magic constants in vc_is_control()")


Best regards,
Krzysztof