[ltt-dev] [PATCH 1/2] use generic-size operations for common implementation of atomic ops

[Paolo Bonzini]

The definition of _uatomic_cmpxchg is different in x86 and other architectures.
For x86 it is a 4-argument macro, for other architectures it is a 3-argument
function.  The next patch will use uatomic_cmpxchg in uatomic_generic.h
even on x86: adjust existing uses of the underscore-prefixed variant for
consistency.

Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
---
 urcu/uatomic_generic.h |   24 ++++++++++++++++--------
 1 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/urcu/uatomic_generic.h b/urcu/uatomic_generic.h
index f65b398..383ddfa 100644
--- a/urcu/uatomic_generic.h
+++ b/urcu/uatomic_generic.h
@@ -201,7 +201,8 @@ unsigned long _uatomic_add_return(void *addr, unsigned long val, int len)
 		oldt = uatomic_read((unsigned char *)addr);
 		do {
 			old = oldt;
-			oldt = _uatomic_cmpxchg(addr, old, old + val, 1);
+			oldt = uatomic_cmpxchg((unsigned char *)addr,
+                                               old, old + val);
 		} while (oldt != old);
 
 		return old + val;
@@ -215,7 +216,8 @@ unsigned long _uatomic_add_return(void *addr, unsigned long val, int len)
 		oldt = uatomic_read((unsigned short *)addr);
 		do {
 			old = oldt;
-			oldt = _uatomic_cmpxchg(addr, old, old + val, 2);
+			oldt = uatomic_cmpxchg((unsigned short *)addr,
+                                               old, old + val);
 		} while (oldt != old);
 
 		return old + val;
@@ -228,7 +230,8 @@ unsigned long _uatomic_add_return(void *addr, unsigned long val, int len)
 		oldt = uatomic_read((unsigned int *)addr);
 		do {
 			old = oldt;
-			oldt = _uatomic_cmpxchg(addr, old, old + val, 4);
+			oldt = uatomic_cmpxchg((unsigned int *)addr,
+                                               old, old + val);
 		} while (oldt != old);
 
 		return old + val;
@@ -241,7 +244,8 @@ unsigned long _uatomic_add_return(void *addr, unsigned long val, int len)
 		oldt = uatomic_read((unsigned long *)addr);
 		do {
 			old = oldt;
-			oldt = _uatomic_cmpxchg(addr, old, old + val, 8);
+			oldt = uatomic_cmpxchg((unsigned long *)addr,
+                                               old, old + val);
 		} while (oldt != old);
 
 		return old + val;
@@ -273,7 +277,8 @@ unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
 		oldt = uatomic_read((unsigned char *)addr);
 		do {
 			old = oldt;
-			oldt = _uatomic_cmpxchg(addr, old, val, 1);
+			oldt = uatomic_cmpxchg((unsigned char *)addr,
+                                               old, val);
 		} while (oldt != old);
 
 		return old;
@@ -287,7 +292,8 @@ unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
 		oldt = uatomic_read((unsigned short *)addr);
 		do {
 			old = oldt;
-			oldt = _uatomic_cmpxchg(addr, old, val, 2);
+			oldt = uatomic_cmpxchg((unsigned short *)addr,
+                                               old, val);
 		} while (oldt != old);
 
 		return old;
@@ -300,7 +306,8 @@ unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
 		oldt = uatomic_read((unsigned int *)addr);
 		do {
 			old = oldt;
-			oldt = _uatomic_cmpxchg(addr, old, val, 4);
+			oldt = uatomic_cmpxchg((unsigned int *)addr,
+                                               old, val);
 		} while (oldt != old);
 
 		return old;
@@ -313,7 +320,8 @@ unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
 		oldt = uatomic_read((unsigned long *)addr);
 		do {
 			old = oldt;
-			oldt = _uatomic_cmpxchg(addr, old, val, 8);
+			oldt = uatomic_cmpxchg((unsigned long *)addr,
+                                               old, val);
 		} while (oldt != old);
 
 		return old;
-- 
1.7.3.2