linux-kernel - Re: [PATCH 2/2] selftests/user_events: Fix abi

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Date:   Tue, 3 Oct 2023 20:59:08 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Beau Belgrave <beaub@...ux.microsoft.com>
Cc:     mhiramat@...nel.org, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, cleger@...osinc.com,
        linux-kselftest@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH 2/2] selftests/user_events: Fix abi_test for BE archs


Note, this doesn't seem to apply to my tree so I only added the first
patch. I think this needs to go through Shuah's tree.

-- Steve


On Mon, 25 Sep 2023 23:08:29 +0000
Beau Belgrave <beaub@...ux.microsoft.com> wrote:

> The abi_test currently uses a long sized test value for enablement
> checks. On LE this works fine, however, on BE this results in inaccurate
> assert checks due to a bit being used and assuming it's value is the
> same on both LE and BE.
> 
> Use int type for 32-bit values and long type for 64-bit values to ensure
> appropriate behavior on both LE and BE.
> 
> Fixes: 60b1af8de8c1 ("tracing/user_events: Add ABI self-test")
> Signed-off-by: Beau Belgrave <beaub@...ux.microsoft.com>
> ---
>  tools/testing/selftests/user_events/abi_test.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/testing/selftests/user_events/abi_test.c b/tools/testing/selftests/user_events/abi_test.c
> index 5125c42efe65..67af4c491c0c 100644
> --- a/tools/testing/selftests/user_events/abi_test.c
> +++ b/tools/testing/selftests/user_events/abi_test.c
> @@ -46,7 +46,7 @@ static int change_event(bool enable)
>  	return ret;
>  }
>  
> -static int reg_enable(long *enable, int size, int bit)
> +static int reg_enable(void *enable, int size, int bit)
>  {
>  	struct user_reg reg = {0};
>  	int fd = open(data_file, O_RDWR);
> @@ -68,7 +68,7 @@ static int reg_enable(long *enable, int size, int bit)
>  	return ret;
>  }
>  
> -static int reg_disable(long *enable, int bit)
> +static int reg_disable(void *enable, int bit)
>  {
>  	struct user_unreg reg = {0};
>  	int fd = open(data_file, O_RDWR);
> @@ -89,12 +89,14 @@ static int reg_disable(long *enable, int bit)
>  }
>  
>  FIXTURE(user) {
> -	long check;
> +	int check;
> +	long check_long;
>  };
>  
>  FIXTURE_SETUP(user) {
>  	change_event(false);
>  	self->check = 0;
> +	self->check_long = 0;
>  }
>  
>  FIXTURE_TEARDOWN(user) {
> @@ -131,9 +133,9 @@ TEST_F(user, bit_sizes) {
>  
>  #if BITS_PER_LONG == 8
>  	/* Allow 0-64 bits for 64-bit */
> -	ASSERT_EQ(0, reg_enable(&self->check, sizeof(long), 63));
> -	ASSERT_NE(0, reg_enable(&self->check, sizeof(long), 64));
> -	ASSERT_EQ(0, reg_disable(&self->check, 63));
> +	ASSERT_EQ(0, reg_enable(&self->check_long, sizeof(long), 63));
> +	ASSERT_NE(0, reg_enable(&self->check_long, sizeof(long), 64));
> +	ASSERT_EQ(0, reg_disable(&self->check_long, 63));
>  #endif
>  
>  	/* Disallowed sizes (everything beside 4 and 8) */
> @@ -195,7 +197,7 @@ static int clone_check(void *check)
>  	for (i = 0; i < 10; ++i) {
>  		usleep(100000);
>  
> -		if (*(long *)check)
> +		if (*(int *)check)
>  			return 0;
>  	}
>