powerpc/pseries: Advance pfn if section is not present in lmb_is_removable()

[mirror_ubuntu-bionic-kernel.git] / Documentation / atomic_t.txt

diff --git a/Documentation/atomic_t.txt b/Documentation/atomic_t.txt
index 913396ac582431cb3acbdc96a1bd7f4293661d0b..ed0d814df7e06a25daf0b381f9929d83e152a57c 100644 (file)
--- a/Documentation/atomic_t.txt
+++ b/Documentation/atomic_t.txt
@@ -177,6 +177,9 @@ These helper barriers exist because architectures have varying implicit
 ordering on their SMP atomic primitives. For example our TSO architectures
 provide full ordered atomics and these barriers are no-ops.
 
+NOTE: when the atomic RmW ops are fully ordered, they should also imply a
+compiler barrier.
+
 Thus:
 
   atomic_fetch_add();