linux-kernel - Re: [PATCH v2] selftests/mqueue: fix 5 warnings about signed/unsigned mismatches

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Message-ID: <444612f4-8f3c-445f-bbdb-9b391dd5d5db@arm.com>
Date: Thu, 9 May 2024 13:42:59 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: John Hubbard <jhubbard@...dia.com>, Shuah Khan <shuah@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 David Hildenbrand <david@...hat.com>, SeongJae Park <sj@...nel.org>,
 Valentin Obst <kernel@...entinobst.de>, linux-kselftest@...r.kernel.org,
 LKML <linux-kernel@...r.kernel.org>, llvm@...ts.linux.dev
Subject: Re: [PATCH v2] selftests/mqueue: fix 5 warnings about signed/unsigned
 mismatches

On 08/05/2024 21:00, John Hubbard wrote:
> When building with clang, via:
> 
>     make LLVM=1 -C tools/testing/selftest
> 
> ...clang warns about several cases of using a signed integer for the
> priority argument to mq_receive(3), which expects an unsigned int.
> 
> Fix this by declaring the type as unsigned int in all cases.
> 
> Also, both input and output priority are unsigned, per the man pages, so
> let's change the type of both priorities throughout, even though clang
> did not warn about the prio_out variable.
> 
> Also, add an argument name to test->func(), in order to address another
> warning from clang.
> 
> Cc: Ryan Roberts <ryan.roberts@....com>
> Signed-off-by: John Hubbard <jhubbard@...dia.com>

Reviewed-by: Ryan Roberts <ryan.roberts@....com>

> ---
>  tools/testing/selftests/mqueue/mq_perf_tests.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/testing/selftests/mqueue/mq_perf_tests.c b/tools/testing/selftests/mqueue/mq_perf_tests.c
> index 5c16159d0bcd..9380c656581f 100644
> --- a/tools/testing/selftests/mqueue/mq_perf_tests.c
> +++ b/tools/testing/selftests/mqueue/mq_perf_tests.c
> @@ -323,7 +323,8 @@ void *fake_cont_thread(void *arg)
>  void *cont_thread(void *arg)
>  {
>  	char buff[MSG_SIZE];
> -	int i, priority;
> +	int i;
> +	unsigned int priority;
>  
>  	for (i = 0; i < num_cpus_to_pin; i++)
>  		if (cpu_threads[i] == pthread_self())
> @@ -373,27 +374,27 @@ void *cont_thread(void *arg)
>  
>  struct test {
>  	char *desc;
> -	void (*func)(int *);
> +	void (*func)(unsigned int *prio);
>  };
>  
> -void const_prio(int *prio)
> +void const_prio(unsigned int *prio)
>  {
>  	return;
>  }
>  
> -void inc_prio(int *prio)
> +void inc_prio(unsigned int *prio)
>  {
>  	if (++*prio == mq_prio_max)
>  		*prio = 0;
>  }
>  
> -void dec_prio(int *prio)
> +void dec_prio(unsigned int *prio)
>  {
>  	if (--*prio < 0)
>  		*prio = mq_prio_max - 1;
>  }
>  
> -void random_prio(int *prio)
> +void random_prio(unsigned int *prio)
>  {
>  	*prio = random() % mq_prio_max;
>  }
> @@ -425,7 +426,7 @@ struct test test2[] = {
>  void *perf_test_thread(void *arg)
>  {
>  	char buff[MSG_SIZE];
> -	int prio_out, prio_in;
> +	unsigned int prio_out, prio_in;
>  	int i;
>  	clockid_t clock;
>  	pthread_t *t;
> 
> base-commit: 45db3ab70092637967967bfd8e6144017638563c
> prerequisite-patch-id: b901ece2a5b78503e2fb5480f20e304d36a0ea27