[PATCH v2 02/19] x86/emul: Drop X86EMUL_CMPXCHG_FAILED

[Andrew Cooper <andrew.cooper3@citrix.com>]

X86EMUL_CMPXCHG_FAILED was introduced in c/s d430aae25 in 2005.  Even at the
time it alised what is now X86EMUL_RETRY (as well as what is now
X86EMUL_EXCEPTION).  I am not sure why the distinction was considered useful
at the time.

It is only used twice; there is no need to call it out differently from other
uses of X86EMUL_RETRY.

No functional change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Tim Deegan <tim@xen.org>

v2:
 * New
---
 xen/arch/x86/mm.c                      | 2 +-
 xen/arch/x86/mm/shadow/multi.c         | 2 +-
 xen/arch/x86/x86_emulate/x86_emulate.h | 2 --
 3 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 03dcd71..5b0e9f3 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -5254,7 +5254,7 @@ static int ptwr_emulated_update(
         {
             unmap_domain_page(pl1e);
             put_page_from_l1e(nl1e, d);
-            return X86EMUL_CMPXCHG_FAILED;
+            return X86EMUL_RETRY;
         }
     }
     else
diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c
index d70b1c6..9ee48a8 100644
--- a/xen/arch/x86/mm/shadow/multi.c
+++ b/xen/arch/x86/mm/shadow/multi.c
@@ -4694,7 +4694,7 @@ sh_x86_emulate_cmpxchg(struct vcpu *v, unsigned long vaddr,
     }
 
     if ( prev != old )
-        rv = X86EMUL_CMPXCHG_FAILED;
+        rv = X86EMUL_RETRY;
 
     SHADOW_DEBUG(EMULATE, "va %#lx was %#lx expected %#lx"
                   " wanted %#lx now %#lx bytes %u\n",
diff --git a/xen/arch/x86/x86_emulate/x86_emulate.h b/xen/arch/x86/x86_emulate/x86_emulate.h
index 993c576..ec824ce 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.h
+++ b/xen/arch/x86/x86_emulate/x86_emulate.h
@@ -109,8 +109,6 @@ struct __attribute__((__packed__)) segment_register {
 #define X86EMUL_EXCEPTION      2
  /* Retry the emulation for some reason. No state modified. */
 #define X86EMUL_RETRY          3
- /* (cmpxchg accessor): CMPXCHG failed. Maps to X86EMUL_RETRY in caller. */
-#define X86EMUL_CMPXCHG_FAILED 3
 
 /* FPU sub-types which may be requested via ->get_fpu(). */
 enum x86_emulate_fpu_type {
-- 
2.1.4


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