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selftests/ring-buffer: Verify the entire meta-page padding

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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: linux-kselftest@vger.kernel.org
Link: https://lore.kernel.org/20240910162335.2993310-2-vdonnefort@google.com
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Vincent Donnefort 2024-09-10 17:23:34 +01:00 committed by Steven Rostedt (Google)
parent 2fcd5aff92
commit 21ff365b5c
1 changed files with 4 additions and 4 deletions
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8
tools/testing/selftests/ring-buffer/map_test.c
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@ -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);
}
}