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-rw-r--r--src/backend/port/tas/sunstudio_sparc.s2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/backend/port/tas/sunstudio_sparc.s b/src/backend/port/tas/sunstudio_sparc.s
index 92103156d26..7fa449e983a 100644
--- a/src/backend/port/tas/sunstudio_sparc.s
+++ b/src/backend/port/tas/sunstudio_sparc.s
@@ -37,6 +37,8 @@ pg_atomic_cas:
!
! http://cvs.opensolaris.org/source/xref/on/usr/src/lib/libc/sparc/threads/sparc.il
!
+ ! NB: We're assuming we're running on a TSO system here - solaris
+ ! userland luckily always has done so.
#if defined(__sparcv9) || defined(__sparcv8plus)
cas [%o0],%o2,%o1