linux-kernel - Re: [PATCH RESEND 1/2] ring-buffer/selftest: Verify the entire meta-page padding

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Message-ID: <20240910124541.23426cee@gandalf.local.home>
Date: Tue, 10 Sep 2024 12:45:41 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Vincent Donnefort <vdonnefort@...gle.com>
Cc: mhiramat@...nel.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, kernel-team@...roid.com, Shuah Khan
 <skhan@...uxfoundation.org>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH RESEND 1/2] ring-buffer/selftest: Verify the entire
 meta-page padding


Shuah,

Can you take this through your tree?

Acked-by: Steven Rostedt (Google) <rostedt@...dmis.org>

-- Steve


On Tue, 10 Sep 2024 17:23:34 +0100
Vincent Donnefort <vdonnefort@...gle.com> wrote:

> Improve the ring-buffer meta-page test coverage by checking for the
> entire padding region to be 0 instead of just looking at the first 4
> bytes.
> 
> Cc: Shuah Khan <skhan@...uxfoundation.org>
> Cc: linux-kselftest@...r.kernel.org
> Signed-off-by: Vincent Donnefort <vdonnefort@...gle.com>
> 
> diff --git a/tools/testing/selftests/ring-buffer/map_test.c b/tools/testing/selftests/ring-buffer/map_test.c
> index 4bb0192e43f3..ba12fd31de87 100644
> --- a/tools/testing/selftests/ring-buffer/map_test.c
> +++ b/tools/testing/selftests/ring-buffer/map_test.c
> @@ -231,15 +231,15 @@ TEST_F(map, data_mmap)
>  
>  	/* Verify meta-page padding */
>  	if (desc->meta->meta_page_size > getpagesize()) {
> -		void *addr;
> -
>  		data_len = desc->meta->meta_page_size;
>  		data = mmap(NULL, data_len,
>  			    PROT_READ, MAP_SHARED, desc->cpu_fd, 0);
>  		ASSERT_NE(data, MAP_FAILED);
>  
> -		addr = (void *)((unsigned long)data + getpagesize());
> -		ASSERT_EQ(*((int *)addr), 0);
> +		for (int i = desc->meta->meta_struct_len;
> +		     i < desc->meta->meta_page_size; i += sizeof(int))
> +			ASSERT_EQ(*(int *)(data + i), 0);
> +
>  		munmap(data, data_len);
>  	}
>  }