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diff --git a/sys/powerpc/powerpc/swtch32.S b/sys/powerpc/powerpc/swtch32.S
--- a/sys/powerpc/powerpc/swtch32.S
+++ b/sys/powerpc/powerpc/swtch32.S
@@ -141,8 +141,8 @@
blocked_loop:
lwz %r7,TD_LOCK(%r2)
cmpw %r6,%r7
- beq- blocked_loop
isync
+ beq- blocked_loop
#endif
lwz %r17,TD_PCB(%r2) /* Get new current PCB */
diff --git a/sys/powerpc/powerpc/swtch64.S b/sys/powerpc/powerpc/swtch64.S
--- a/sys/powerpc/powerpc/swtch64.S
+++ b/sys/powerpc/powerpc/swtch64.S
@@ -194,8 +194,8 @@
blocked_loop:
ld %r7,TD_LOCK(%r13)
cmpd %r6,%r7
- beq- blocked_loop
isync
+ beq- blocked_loop
#endif
ld %r17,TD_PCB(%r13) /* Get new PCB */

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