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Sender: Guenter Roeck <groeck7@gmail.com>
Date: Wed, 21 Feb 2024 05:25:47 -0800
From: Guenter Roeck <linux@roeck-us.net>
To: David Gow <davidgow@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Shuah Khan <skhan@linuxfoundation.org>, Rae Moar <rmoar@google.com>,
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Subject: Re: [PATCH 3/9] lib: memcpy_kunit: Fix an invalid format specifier
 in an assertion msg
Message-ID: <de3abf44-6ce1-4bc1-9480-a977d83aba3b@roeck-us.net>
References: <20240221092728.1281499-1-davidgow@google.com>
 <20240221092728.1281499-4-davidgow@google.com>
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In-Reply-To: <20240221092728.1281499-4-davidgow@google.com>

On Wed, Feb 21, 2024 at 05:27:16PM +0800, David Gow wrote:
> The 'i' passed as an assertion message is a size_t, so should use '%zu',
> not '%d'.
> 
> This was found by annotating the _MSG() variants of KUnit's assertions
> to let gcc validate the format strings.
> 
> Fixes: bb95ebbe89a7 ("lib: Introduce CONFIG_MEMCPY_KUNIT_TEST")
> Signed-off-by: David Gow <davidgow@google.com>

Tested-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  lib/memcpy_kunit.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/memcpy_kunit.c b/lib/memcpy_kunit.c
> index 440aee705ccc..30e00ef0bf2e 100644
> --- a/lib/memcpy_kunit.c
> +++ b/lib/memcpy_kunit.c
> @@ -32,7 +32,7 @@ struct some_bytes {
>  	BUILD_BUG_ON(sizeof(instance.data) != 32);	\
>  	for (size_t i = 0; i < sizeof(instance.data); i++) {	\
>  		KUNIT_ASSERT_EQ_MSG(test, instance.data[i], v, \
> -			"line %d: '%s' not initialized to 0x%02x @ %d (saw 0x%02x)\n", \
> +			"line %d: '%s' not initialized to 0x%02x @ %zu (saw 0x%02x)\n", \
>  			__LINE__, #instance, v, i, instance.data[i]);	\
>  	}	\
>  } while (0)
> @@ -41,7 +41,7 @@ struct some_bytes {
>  	BUILD_BUG_ON(sizeof(one) != sizeof(two)); \
>  	for (size_t i = 0; i < sizeof(one); i++) {	\
>  		KUNIT_EXPECT_EQ_MSG(test, one.data[i], two.data[i], \
> -			"line %d: %s.data[%d] (0x%02x) != %s.data[%d] (0x%02x)\n", \
> +			"line %d: %s.data[%zu] (0x%02x) != %s.data[%zu] (0x%02x)\n", \
>  			__LINE__, #one, i, one.data[i], #two, i, two.data[i]); \
>  	}	\
>  	kunit_info(test, "ok: " TEST_OP "() " name "\n");	\
> -- 
> 2.44.0.rc0.258.g7320e95886-goog
>