[Xen-changelog] [xen master] x86: Address "Bitwise-and with zero CONSTANT_EXPRESSION_RESULT" Coverity issues

[patchbot@xxxxxxx]

commit 0932210ac0956fe0ce6f23cf73f56d7c2f9bc5df
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Wed Jun 27 13:26:36 2018 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Jul 4 12:12:15 2018 +0100

    x86: Address "Bitwise-and with zero CONSTANT_EXPRESSION_RESULT" Coverity 
issues
    
    Coverity complains at code which which performs a bitwise and with a 
constant
    that happens to be zero.  Rearrange the C to test the constant first and 
short
    circuit the bitwise and.
    
    No functional change.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <JBeulich@xxxxxxxx>
---
 xen/arch/x86/mm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 4629bcaa47..a1a1f5f3c3 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -1225,7 +1225,7 @@ void put_page_from_l1e(l1_pgentry_t l1e, struct domain 
*l1e_owner)
      * (Note that the undestroyable active grants are not a security hole in
      * Xen. All active grants can safely be cleaned up when the domain dies.)
      */
-    if ( (l1e_get_flags(l1e) & _PAGE_GNTTAB) &&
+    if ( _PAGE_GNTTAB && (l1e_get_flags(l1e) & _PAGE_GNTTAB) &&
          !l1e_owner->is_shutting_down && !l1e_owner->is_dying )
     {
         gdprintk(XENLOG_WARNING,
--
generated by git-patchbot for /home/xen/git/xen.git#master

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