GL_GLOCK_HOLD_INCR
gl->gl_hold_time = min(gl->gl_hold_time + GL_GLOCK_HOLD_INCR,
max_shift = BITS_PER_LONG - 2 - __fls(GL_GLOCK_HOLD_INCR);
incr = min(GL_GLOCK_HOLD_INCR << min(retries - 1, max_shift),