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
79 		errseq_t new;  in errseq_set()  local
81 		/* Clear out error bits and set new error */  in errseq_set()
82 		new = (old & ~(MAX_ERRNO|ERRSEQ_SEEN)) | -err;  in errseq_set()
86 			new += ERRSEQ_CTR_INC;  in errseq_set()
89 		if (new == old) {  in errseq_set()
90 			cur = new;  in errseq_set()
94 		/* Try to swap the new value into place */  in errseq_set()
95 		cur = cmpxchg(eseq, old, new);  in errseq_set()
101 		if (likely(cur == old || cur == new))  in errseq_set()
116  * If the error has been "seen", new callers will not see an old error.
164  * swap it into place as the new eseq value. Then, set that value as the new
172  * Return: Negative errno if one has been stored, or 0 if no new error has
178 	errseq_t old, new;  in errseq_check_and_advance()  local
199 		new = old | ERRSEQ_SEEN;  in errseq_check_and_advance()
200 		if (new != old)  in errseq_check_and_advance()
201 			cmpxchg(eseq, old, new);  in errseq_check_and_advance()
202 		*since = new;  in errseq_check_and_advance()
203 		err = -(new & MAX_ERRNO);  in errseq_check_and_advance()