[xen staging] x86: Fix missing breaks

[patchbot@xxxxxxx]

commit f1b1860226a62242c0bfe1b8ce5d0d54520428d2
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Dec 5 19:36:00 2025 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Fri Dec 12 03:04:48 2025 +0000

    x86: Fix missing breaks
    
    With the wider testing, some more violations have been spotted.  This
    addresses violations of Rule 16.3 which requires all case statements to be
    terminated with a break or other unconditional control flow change.
    
    No functional change.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
---
 xen/arch/x86/domain.c          | 1 +
 xen/arch/x86/mm/shadow/hvm.c   | 1 +
 xen/arch/x86/pv/emul-priv-op.c | 1 +
 xen/arch/x86/pv/emulate.c      | 1 +
 xen/common/livepatch.c         | 1 -
 xen/common/livepatch_elf.c     | 1 +
 6 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 5e37bfbd17..b151201809 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1517,6 +1517,7 @@ int arch_set_info_guest(
         {
         case -EINTR:
             rc = -ERESTART;
+            fallthrough;
         case -ERESTART:
             break;
         case 0:
diff --git a/xen/arch/x86/mm/shadow/hvm.c b/xen/arch/x86/mm/shadow/hvm.c
index 114957a3e1..69334c0956 100644
--- a/xen/arch/x86/mm/shadow/hvm.c
+++ b/xen/arch/x86/mm/shadow/hvm.c
@@ -268,6 +268,7 @@ hvm_emulate_cmpxchg(enum x86_segment seg,
     default:
         SHADOW_PRINTK("cmpxchg size %u is not supported\n", bytes);
         prev = ~old;
+        break;
     }
 
     if ( prev != old )
diff --git a/xen/arch/x86/pv/emul-priv-op.c b/xen/arch/x86/pv/emul-priv-op.c
index f1e8f4e014..e6d370cd81 100644
--- a/xen/arch/x86/pv/emul-priv-op.c
+++ b/xen/arch/x86/pv/emul-priv-op.c
@@ -407,6 +407,7 @@ static void _guest_io_write(unsigned int port, unsigned int 
bytes,
 
     default:
         ASSERT_UNREACHABLE();
+        break;
     }
 }
 
diff --git a/xen/arch/x86/pv/emulate.c b/xen/arch/x86/pv/emulate.c
index e741e686c1..0022e0f55e 100644
--- a/xen/arch/x86/pv/emulate.c
+++ b/xen/arch/x86/pv/emulate.c
@@ -120,6 +120,7 @@ void pv_set_reg(struct vcpu *v, unsigned int reg, uint64_t 
val)
         printk(XENLOG_G_ERR "%s(%pv, 0x%08x, 0x%016"PRIx64") Bad register\n",
                __func__, v, reg, val);
         domain_crash(d);
+        break;
     }
 }
 
diff --git a/xen/common/livepatch.c b/xen/common/livepatch.c
index 9357c1b77a..d0da2aa281 100644
--- a/xen/common/livepatch.c
+++ b/xen/common/livepatch.c
@@ -1924,7 +1924,6 @@ static void noinline do_livepatch_work(void)
                             p->name);
                     ASSERT_UNREACHABLE();
                 }
-            default:
                 break;
             }
         }
diff --git a/xen/common/livepatch_elf.c b/xen/common/livepatch_elf.c
index 25ce1bd5a0..2e82f2cb8c 100644
--- a/xen/common/livepatch_elf.c
+++ b/xen/common/livepatch_elf.c
@@ -347,6 +347,7 @@ int livepatch_elf_resolve_symbols(struct livepatch_elf *elf)
                 dprintk(XENLOG_DEBUG, LIVEPATCH "%s: Symbol resolved: %s => 
%#"PRIxElfAddr" (%s)\n",
                        elf->name, elf->sym[i].name,
                        st_value, elf->sec[idx].name);
+            break;
         }
 
         if ( rc )
--
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