linux-kernel - Re: [PATCH] kunit: string-stream-test: Avoid cast warning when testing gfp

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Message-ID: <CA+GJov50r+0vPj6gtgXXuaKf8nQqt9CVM8dGUsJcxiFupxo7Sw@mail.gmail.com>
Date:   Wed, 29 Nov 2023 16:18:48 -0500
From:   Rae Moar <rmoar@...gle.com>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>
Cc:     brendan.higgins@...ux.dev, davidgow@...gle.com,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, patches@...nsource.cirrus.com,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] kunit: string-stream-test: Avoid cast warning when
 testing gfp_t flags

On Tue, Nov 21, 2023 at 11:25 AM Richard Fitzgerald
<rf@...nsource.cirrus.com> wrote:
>
> Passing a gfp_t to KUNIT_EXPECT_EQ() causes a cast warning:
>
>   lib/kunit/string-stream-test.c:73:9: sparse: sparse: incorrect type in
>   initializer (different base types) expected long long right_value
>   got restricted gfp_t const __right
>
> Avoid this by testing stream->gfp for the expected value and passing the
> boolean result of this comparison to KUNIT_EXPECT_TRUE(), as was already
> done a few lines above in string_stream_managed_init_test().
>
> Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
> Fixes: d1a0d699bfc0 ("kunit: string-stream: Add tests for freeing resource-managed string_stream")
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202311181918.0mpCu2Xh-lkp@intel.com/

Hello!

This looks good to me. Thanks for fixing this!

Reviewed-by: Rae Moar <rmoar@...gle.com>

-Rae

> ---
>  lib/kunit/string-stream-test.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/kunit/string-stream-test.c b/lib/kunit/string-stream-test.c
> index 06822766f29a..03fb511826f7 100644
> --- a/lib/kunit/string-stream-test.c
> +++ b/lib/kunit/string-stream-test.c
> @@ -72,7 +72,7 @@ static void string_stream_unmanaged_init_test(struct kunit *test)
>
>         KUNIT_EXPECT_EQ(test, stream->length, 0);
>         KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));
> -       KUNIT_EXPECT_EQ(test, stream->gfp, GFP_KERNEL);
> +       KUNIT_EXPECT_TRUE(test, (stream->gfp == GFP_KERNEL));
>         KUNIT_EXPECT_FALSE(test, stream->append_newlines);
>
>         KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
> --
> 2.30.2
>