shared: Fix undefined behavior when calculating next power of two According to GCC documentation, __builtin_clz() is undefined if argument is zero. The following problem was detected when compiling with -O0: ERROR:unit/test-ringbuf.c:70:test_power2: assertion failed: (size1 == size2) Also refactor align_power2() so the internal "find last set bit" operation is in its own fls() function (similar to how kernel does). fls() checks if argument is zero before calling __builtin_clz().

Diffstat

2 files changed, 14 insertions(+), 2 deletions(-)