X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fassembly%2Fx86-64%2Falloc.lisp;h=2c113b0332734232e87cd5a75a21bdf38007e95b;hb=c0578d9893429c9c0da80ea5920360e4621fddab;hp=68a8ce33c31441fcbfe17c44a37f1937e81f76bb;hpb=c6538bf61955a67d0145aa3e6c937f6dd03f9e51;p=sbcl.git

diff --git a/src/assembly/x86-64/alloc.lisp b/src/assembly/x86-64/alloc.lisp
index 68a8ce3..2c113b0 100644
--- a/src/assembly/x86-64/alloc.lisp
+++ b/src/assembly/x86-64/alloc.lisp
@@ -94,8 +94,7 @@
                (emit-label get-tls-index-lock)
                (inst mov target 1)
                (zeroize rax-tn)
-               (inst lock)
-               (inst cmpxchg (make-ea-for-symbol-value *tls-index-lock*) target)
+               (inst cmpxchg (make-ea-for-symbol-value *tls-index-lock*) target :lock)
                (inst jmp :ne get-tls-index-lock)
                ;; The symbol is now in OTHER.
                (inst pop other)
@@ -113,6 +112,7 @@
                      (fixnumize 1))
                (storew target other symbol-tls-index-slot other-pointer-lowtag)
                (emit-label release-tls-index-lock)
+               ;; No need for barriers on x86/x86-64 on unlock.
                (store-symbol-value 0 *tls-index-lock*)
                ;; Restore OTHER.
                (inst pop other))