19  * can later be used to tell whether any new errors have occurred since that
22  * Note that there is a risk of collisions if new errors are being recorded
26  * been sampled since a new value was recorded. That allows us to avoid bumping
30  * A new errseq_t should always be zeroed out.  A errseq_t value of all zeroes
80 		errseq_t new;  in errseq_set()  local
82 		/* Clear out error bits and set new error */  in errseq_set()
83 		new = (old & ~(ERRNO_MASK | ERRSEQ_SEEN)) | -err;  in errseq_set()
87 			new += ERRSEQ_CTR_INC;  in errseq_set()
90 		if (new == old) {  in errseq_set()
91 			cur = new;  in errseq_set()
95 		/* Try to swap the new value into place */  in errseq_set()
96 		cur = cmpxchg(eseq, old, new);  in errseq_set()
102 		if (likely(cur == old || cur == new))  in errseq_set()
117  * If the error has been "seen", new callers will not see an old error.
165  * swap it into place as the new eseq value. Then, set that value as the new
173  * Return: Negative errno if one has been stored, or 0 if no new error has
179 	errseq_t old, new;  in errseq_check_and_advance()  local
200 		new = old | ERRSEQ_SEEN;  in errseq_check_and_advance()
201 		if (new != old)  in errseq_check_and_advance()
202 			cmpxchg(eseq, old, new);  in errseq_check_and_advance()
203 		*since = new;  in errseq_check_and_advance()
204 		err = -(new & ERRNO_MASK);  in errseq_check_and_advance()