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Current log2_ceil(x) is defined as log2(x * 2 - 1). When x is larger than (1 << 31), (x * 2 - 1) won't fit in u32, leading to incorrect result. Therefore, correct it as (log2(x - 1) + 1). Also add unit tests for inline functions in lib.h. BUG=none TEST=make tests/lib/lib-test BRANCH=none Change-Id: If868f793b909a6ad7fc48a7affac15e2c714fa2e Signed-off-by: Yu-Ping Wu <yupingso@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/59834 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-by: Paul Menzel <paulepanter@mailbox.org>