[Xen-devel] [PATCH 3/5] xen: use masking operation instead of test_bit for VGCF bits

[Juergen Gross <jgross@xxxxxxxx>]

Use a bit mask for testing of a set bit instead of test_bit in case no
atomic operation is needed, as this will lead to smaller and more
effective code.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/arch/x86/domain.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index dc3bb08..4e96f6c 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1352,7 +1352,7 @@ static void load_segments(struct vcpu *n)
                 domain_crash(n->domain);
             }
 
-            if ( test_bit(_VGCF_failsafe_disables_events, &n->arch.vgc_flags) )
+            if ( n->arch.vgc_flags & VGCF_failsafe_disables_events )
                 vcpu_info(n, evtchn_upcall_mask) = 1;
 
             regs->entry_vector |= TRAP_syscall;
@@ -1394,7 +1394,7 @@ static void load_segments(struct vcpu *n)
             domain_crash(n->domain);
         }
 
-        if ( test_bit(_VGCF_failsafe_disables_events, &n->arch.vgc_flags) )
+        if ( n->arch.vgc_flags & VGCF_failsafe_disables_events )
             vcpu_info(n, evtchn_upcall_mask) = 1;
 
         regs->entry_vector |= TRAP_syscall;
-- 
2.1.4


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