[xen master] guestcopy: evaluate {, __}copy{, _field}_to_guest*() ptr argument just once

[patchbot@xxxxxxx]

commit d0ee8e9ca4d4163e42dcd5f1cf13e4fae30a4190
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Apr 27 09:30:16 2020 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Apr 27 09:30:16 2020 +0200

    guestcopy: evaluate {,__}copy{,_field}_to_guest*() ptr argument just once
    
    There's nothing wrong with having e.g.
    
        copy_to_guest(uarg, ptr++, 1);
    
    yet until now this would increment "ptr" twice.
    
    Also drop a pair of unneeded parentheses from every instance at this
    occasion.
    
    Fixes: b7954cc59831 ("Enhance guest memory accessor macros so that source 
operands can be")
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 xen/include/asm-arm/guest_access.h | 8 ++++----
 xen/include/asm-x86/guest_access.h | 8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/xen/include/asm-arm/guest_access.h 
b/xen/include/asm-arm/guest_access.h
index 3b8d4ec322..64d01951a9 100644
--- a/xen/include/asm-arm/guest_access.h
+++ b/xen/include/asm-arm/guest_access.h
@@ -80,7 +80,7 @@ int access_guest_memory_by_ipa(struct domain *d, paddr_t ipa, 
void *buf,
     char (*_d)[sizeof(*_s)] = (void *)(hnd).p;          \
     /* Check that the handle is not for a const type */ \
     void *__maybe_unused _t = (hnd).p;                  \
-    ((void)((hnd).p == (ptr)));                         \
+    (void)((hnd).p == _s);                              \
     raw_copy_to_guest(_d+(off), _s, sizeof(*_s)*(nr));  \
 })
 
@@ -107,7 +107,7 @@ int access_guest_memory_by_ipa(struct domain *d, paddr_t 
ipa, void *buf,
 #define copy_field_to_guest(hnd, ptr, field) ({         \
     const typeof(&(ptr)->field) _s = &(ptr)->field;     \
     void *_d = &(hnd).p->field;                         \
-    ((void)(&(hnd).p->field == &(ptr)->field));         \
+    (void)(&(hnd).p->field == _s);                      \
     raw_copy_to_guest(_d, _s, sizeof(*_s));             \
 })
 
@@ -131,7 +131,7 @@ int access_guest_memory_by_ipa(struct domain *d, paddr_t 
ipa, void *buf,
     char (*_d)[sizeof(*_s)] = (void *)(hnd).p;          \
     /* Check that the handle is not for a const type */ \
     void *__maybe_unused _t = (hnd).p;                  \
-    ((void)((hnd).p == (ptr)));                         \
+    (void)((hnd).p == _s);                              \
     __raw_copy_to_guest(_d+(off), _s, sizeof(*_s)*(nr));\
 })
 
@@ -148,7 +148,7 @@ int access_guest_memory_by_ipa(struct domain *d, paddr_t 
ipa, void *buf,
 #define __copy_field_to_guest(hnd, ptr, field) ({       \
     const typeof(&(ptr)->field) _s = &(ptr)->field;     \
     void *_d = &(hnd).p->field;                         \
-    ((void)(&(hnd).p->field == &(ptr)->field));         \
+    (void)(&(hnd).p->field == _s);                      \
     __raw_copy_to_guest(_d, _s, sizeof(*_s));           \
 })
 
diff --git a/xen/include/asm-x86/guest_access.h 
b/xen/include/asm-x86/guest_access.h
index a22745ceb4..064527895f 100644
--- a/xen/include/asm-x86/guest_access.h
+++ b/xen/include/asm-x86/guest_access.h
@@ -89,7 +89,7 @@
     char (*_d)[sizeof(*_s)] = (void *)(hnd).p;          \
     /* Check that the handle is not for a const type */ \
     void *__maybe_unused _t = (hnd).p;                  \
-    ((void)((hnd).p == (ptr)));                         \
+    (void)((hnd).p == _s);                              \
     raw_copy_to_guest(_d+(off), _s, sizeof(*_s)*(nr));  \
 })
 
@@ -112,7 +112,7 @@
 #define copy_field_to_guest(hnd, ptr, field) ({         \
     const typeof(&(ptr)->field) _s = &(ptr)->field;     \
     void *_d = &(hnd).p->field;                         \
-    ((void)(&(hnd).p->field == &(ptr)->field));         \
+    (void)(&(hnd).p->field == _s);                      \
     raw_copy_to_guest(_d, _s, sizeof(*_s));             \
 })
 
@@ -141,7 +141,7 @@
     char (*_d)[sizeof(*_s)] = (void *)(hnd).p;          \
     /* Check that the handle is not for a const type */ \
     void *__maybe_unused _t = (hnd).p;                  \
-    ((void)((hnd).p == (ptr)));                         \
+    (void)((hnd).p == _s);                              \
     __raw_copy_to_guest(_d+(off), _s, sizeof(*_s)*(nr));\
 })
 
@@ -159,7 +159,7 @@
 #define __copy_field_to_guest(hnd, ptr, field) ({       \
     const typeof(&(ptr)->field) _s = &(ptr)->field;     \
     void *_d = &(hnd).p->field;                         \
-    ((void)(&(hnd).p->field == &(ptr)->field));         \
+    (void)(&(hnd).p->field == _s);                      \
     __raw_copy_to_guest(_d, _s, sizeof(*_s));           \
 })
 
--
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