From: Oliver Kurth <okurth@vmware.com>
Date: Fri, 15 Sep 2017 18:23:35 +0000 (-0700)
Subject: Delete unused COMPILER_FORCED_LOAD_AND_MEM_BARRIER
X-Git-Tag: stable-10.2.0~255
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7e2a13784c6d3cc7ef4d57957608e1bd9e8b4b59;p=thirdparty%2Fopen-vm-tools.git

Delete unused COMPILER_FORCED_LOAD_AND_MEM_BARRIER

Delete the macro definition.
---

diff --git a/open-vm-tools/lib/include/vm_basic_asm.h b/open-vm-tools/lib/include/vm_basic_asm.h
index 3e7e77371..035ab5570 100644
--- a/open-vm-tools/lib/include/vm_basic_asm.h
+++ b/open-vm-tools/lib/include/vm_basic_asm.h
@@ -773,47 +773,6 @@ Bswap64(uint64 v) // IN
 }
 
 
-/*
- *----------------------------------------------------------------------
- *
- * COMPILER_FORCED_LOAD_AND_MEM_BARRIER --
- *
- *        This macro prevents the compiler from re-ordering memory references
- *        across the barrier. In addition it emits a forced load from the given
- *        memory reference. The memory reference has to be either 1, 2, 4 or 8
- *        bytes wide.
- *        The forced load of a memory reference can be used exploit details of a
- *        given CPUs memory model. For example x86 CPUs won't reorder stores to
- *        a memory location x with loads from a memory location x.
- *        NOTE: It does not generate any fencing instruction, so the CPU is free
- *              to reorder instructions according to its memory model.
- *
- * Results:
- *        None
- *
- * Side Effects:
- *        None.
- *
- *----------------------------------------------------------------------
- */
-
-#ifdef VM_X86_64
-#ifdef __GNUC__
-
-#define COMPILER_FORCED_LOAD_AND_MEM_BARRIER(_memory_reference)               \
-   do {                                                                       \
-      typeof(_memory_reference) _dummy;                                       \
-                                                                              \
-      asm volatile("mov %1, %0\n\t"                                           \
-                   : "=r" (_dummy) /* Let compiler choose reg for _dummy */   \
-                   : "m" (_memory_reference)                                  \
-                   : "memory");                                               \
-   } while(0)
-
-#endif /* __GNUC__ */
-#endif /* VM_X86_64 */
-
-
 /*
  * PAUSE is a P4 instruction that improves spinlock power+performance;
  * on non-P4 IA32 systems, the encoding is interpreted as a REPZ-NOP.