linux-kernel - Re: linux-next: build warning after merge of the hyperv tree

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Message-ID: <20210518104944.itnusipj755gsr5m@liuwe-devbox-debian-v2>
Date:   Tue, 18 May 2021 10:49:44 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Wei Liu <wei.liu@...nel.org>, YueHaibing <yuehaibing@...wei.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the hyperv tree

On Tue, May 18, 2021 at 05:04:21PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the hyperv tree, today's linux-next build (x86_64
> allmodconfig) produced this warning:
> 
> In file included from include/linux/printk.h:7,
>                  from include/linux/kernel.h:17,
>                  from drivers/hv/hv_util.c:11:
> drivers/hv/hv_util.c: In function 'hv_timesync_init':
> include/linux/kern_levels.h:5:18: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'int' [-Wformat=]
>     5 | #define KERN_SOH "\001"  /* ASCII Start Of Header */
>       |                  ^~~~~~
> include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH'
>    11 | #define KERN_ERR KERN_SOH "3" /* error conditions */
>       |                  ^~~~~~~~
> include/linux/printk.h:343:9: note: in expansion of macro 'KERN_ERR'
>   343 |  printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
>       |         ^~~~~~~~
> drivers/hv/hv_util.c:753:3: note: in expansion of macro 'pr_err'
>   753 |   pr_err("cannot register PTP clock: %ld\n",
>       |   ^~~~~~
> 
> Introduced by commit
> 
>   32c0ff83550e ("hv_utils: Fix passing zero to 'PTR_ERR' warning")
> 

Thanks Stephen.

PTR_ERR_OR_ZERO returns int while PTR_ERR returns long. That's why this
warning is triggered.

I will fix it in hyperv-next.

Wei.

> -- 
> Cheers,
> Stephen Rothwell