[coreboot-gerrit] Change in coreboot[master]: lib: Fix log2_ceil() for 0xffffffff

[Yu-Ping Wu (Code Review)]

Attention is currently required from: Julius Werner, Yu-Ping Wu.
Hello build bot (Jenkins), Jakub Czapiga, Paul Menzel, Julius Werner,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/59834

to look at the new patch set (#3).

Change subject: lib: Fix log2_ceil() for 0xffffffff
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lib: Fix log2_ceil() for 0xffffffff

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 
---
M src/include/lib.h
M tests/lib/Makefile.inc
A tests/lib/lib-test.c
3 files changed, 65 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/34/59834/3