I noticed that backports of commit 69d927bba395 "x86/atomic: Fix
smp_mb__{before,after}_atomic()" didn't touch atomic_or_long() (present
in 3.16) or atomic_inc_short() (present in 4.9 and earlier).
These functions were only implemented on x86 and not actually used in-
tree. But it's possible they are used by some out-of-tree module, and
that commit removed compiler barriers for them.
Would it might make sense to either
1. Add the memory clobber to these functions, or
2. Delete them
on the affected stable branches?
Ben.
--
Ben Hutchings
Larkinson's Law: All laws are basically false.
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