CCTRNG_DATA_BUF_WORDS
*idx &= (CCTRNG_DATA_BUF_WORDS - 1);
drvdata->circ.tail, CCTRNG_DATA_BUF_WORDS);
drvdata->circ.tail, CCTRNG_DATA_BUF_WORDS);
drvdata->circ.tail, CCTRNG_DATA_BUF_WORDS);
BUILD_BUG_ON(CCTRNG_DATA_BUF_WORDS < 6);
BUILD_BUG_ON((CCTRNG_DATA_BUF_WORDS & (CCTRNG_DATA_BUF_WORDS-1)) != 0);
u32 data_buf[CCTRNG_DATA_BUF_WORDS];