N_ELEMENTS - Linux

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u8 buffer1[N_ELEMENTS];

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for (int i = 0; i < N_ELEMENTS; i++)

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kfifo_in(&my_fifo, buffer1, N_ELEMENTS);

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KUNIT_EXPECT_EQ(test, kfifo_len(&my_fifo), N_ELEMENTS);

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kfifo_in(&my_fifo, buffer1, N_ELEMENTS);

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KUNIT_EXPECT_EQ(test, kfifo_len(&my_fifo), N_ELEMENTS * 2);