[xen staging] x86/pv: Improve code generation in async_exception_cleanup()

[patchbot@xxxxxxx]

commit fcc3289cdf18c5ae5d7b066f7c6c82c188f7e679
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Mon Nov 2 16:22:11 2026 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Nov 4 18:11:35 2026 +0000

    x86/pv: Improve code generation in async_exception_cleanup()
    
    Use new helpers to simplfiy the logic.  No functional change.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/pv/iret.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/pv/iret.c b/xen/arch/x86/pv/iret.c
index 39ce316b8d..52430f38d2 100644
--- a/xen/arch/x86/pv/iret.c
+++ b/xen/arch/x86/pv/iret.c
@@ -31,8 +31,8 @@ static void async_exception_cleanup(struct vcpu *curr)
     if ( !curr->arch.async_exception_mask )
         return;
 
-    if ( !(curr->arch.async_exception_mask & (curr->arch.async_exception_mask 
- 1)) )
-        trap = __scanbit(curr->arch.async_exception_mask, VCPU_TRAP_NONE);
+    if ( !multiple_bits_set(curr->arch.async_exception_mask) )
+        trap = ffs(curr->arch.async_exception_mask) - 1;
     else
         for ( trap = VCPU_TRAP_NONE + 1; trap <= VCPU_TRAP_LAST; ++trap )
             if ( (curr->arch.async_exception_mask ^
--
generated by git-patchbot for /home/xen/git/xen.git#staging