From: Konstantin Belousov <k...@freebsd.org> In this case volatile qualifiers enusre that a compiler does not optimize the accesses out.
Reviewed by: alc, jhb Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D13534 --- cpukit/score/src/kern_tc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/cpukit/score/src/kern_tc.c b/cpukit/score/src/kern_tc.c index b17327a2f8..9e6602e478 100644 --- a/cpukit/score/src/kern_tc.c +++ b/cpukit/score/src/kern_tc.c @@ -1799,10 +1799,10 @@ pps_fetch(struct pps_fetch_args *fapi, struct pps_state *pps) tv.tv_usec = fapi->timeout.tv_nsec / 1000; timo = tvtohz(&tv); } - aseq = pps->ppsinfo.assert_sequence; - cseq = pps->ppsinfo.clear_sequence; - while (aseq == pps->ppsinfo.assert_sequence && - cseq == pps->ppsinfo.clear_sequence) { + aseq = atomic_load_int(&pps->ppsinfo.assert_sequence); + cseq = atomic_load_int(&pps->ppsinfo.clear_sequence); + while (aseq == atomic_load_int(&pps->ppsinfo.assert_sequence) && + cseq == atomic_load_int(&pps->ppsinfo.clear_sequence)) { if (abi_aware(pps, 1) && pps->driver_mtx != NULL) { if (pps->flags & PPSFLAG_MTX_SPIN) { err = msleep_spin(pps, pps->driver_mtx, -- 2.17.1 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
