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

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Date: Tue, 5 Mar 2024 01:54:50 -0800
From: Kees Cook <keescook@...omium.org>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: 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 kspp tree

On Tue, Mar 05, 2024 at 02:50:18PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the kspp tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
> 
> In file included from lib/string_kunit.c:8:
> lib/string_kunit.c: In function 'test_strspn':
> lib/string_kunit.c:176:25: error: format '%d' expects argument of type 'int', but argument 7 has type 'size_t' {aka 'long unsigned int'} [-Werror=format=]
>   176 |                         "i:%d", i);
>       |                         ^~~~~~  ~
>       |                                 |
>       |                                 size_t {aka long unsigned int}

I was really scratching my head on this one. I didn't see the warning on
my end because this is actually a result of the merge, namely KUnit
becoming correctly stricter about format strings:

806cb2270237 ("kunit: Annotate _MSG assertion variants with gnu printf specifiers")

I will fix the format string! :)

-- 
Kees Cook