linux-kernel - Re: [PATCH v3 2/3] selftests: soft-dirty: Add test for mprotect

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Date:   Fri, 22 Jul 2022 09:17:34 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Peter Xu <peterx@...hat.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     Nadav Amit <nadav.amit@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH v3 2/3] selftests: soft-dirty: Add test for mprotect

On 21.07.22 20:33, Peter Xu wrote:
> Add two soft-diryt test cases for mprotect() on both anon or file.

s/soft-diryt/soft-dirty/

> 
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  tools/testing/selftests/vm/soft-dirty.c | 69 ++++++++++++++++++++++++-
>  1 file changed, 68 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/vm/soft-dirty.c b/tools/testing/selftests/vm/soft-dirty.c
> index 08ab62a4a9d0..7d93906aa43f 100644
> --- a/tools/testing/selftests/vm/soft-dirty.c
> +++ b/tools/testing/selftests/vm/soft-dirty.c
> @@ -121,13 +121,78 @@ static void test_hugepage(int pagemap_fd, int pagesize)
>  	free(map);
>  }
>  
> +static void test_mprotect(int pagemap_fd, int pagesize, bool anon)
> +{
> +	const char *type[] = {"file", "anon"};
> +	const char *fname = "./soft-dirty-test-file";
> +	int test_fd;
> +	char *map;

Instead of fname, unlink, open, close, unlink  you can use a tmpfile

FILE *file;

file = tmpfile();
if (!file) {
	ksft_test_result_fail("tmpfile() failed\n");
	return;
}
test_fd = fileno(file);

> +
> +	if (anon) {
> +		map = mmap(NULL, pagesize, PROT_READ|PROT_WRITE,
> +			   MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
> +		if (!map)
> +			ksft_exit_fail_msg("anon mmap failed\n");
> +	} else {
> +		unlink(fname);
> +		test_fd = open(fname, O_RDWR | O_CREAT);
> +		if (test_fd < 0) {
> +			ksft_test_result_skip("Test %s huge page allocation\n", __func__);

Wrong copy-paste I assume :)

> +			return;
> +		}
> +		ftruncate(test_fd, pagesize);
> +		map = mmap(NULL, pagesize, PROT_READ|PROT_WRITE,
> +			   MAP_SHARED, test_fd, 0);
> +		if (!map)
> +			ksft_exit_fail_msg("file mmap failed\n");
> +	}
> +

Apart from that LGTM.


-- 
Thanks,

David / dhildenb