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From:   Alexander Potapenko <glider@google.com>
Date:   Mon, 25 Sep 2023 14:16:37 +0200
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Subject: Re: [PATCH v5 2/5] lib/test_bitmap: add tests for bitmap_{read,write}()
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>
> +/*
> + * Test bitmap should be big enough to include the cases when start is not in
> + * the first word, and start+nbits lands in the following word.
> + */
> +#define TEST_BIT_LEN (1000)

Dunno why this didn't fire previously, but CONFIG_CPU_BIG_ENDIAN=y
kernel reports mismatches here, presumably because the last quad word
ends up partially initialized.
The easiest fix is to make TEST_BIT_LEN divisible by 64 (e.g. 1024)