[xen staging] domain: domlist_update_lock can be static

[patchbot@xxxxxxx]

commit 0969fc9fa121a19a7ad7e1c286a22029d3cbecf4
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jul 1 14:14:30 2026 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jul 1 14:14:30 2026 +0200

    domain: domlist_update_lock can be static
    
    For a long time (if not forever) this lock has been referenced only from a
    single CU. Misra C:2012 rule 8.7 (which we didn't accept yet) wants us to
    have such identifiers non-external.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 xen/common/domain.c     | 2 +-
 xen/include/xen/sched.h | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/xen/common/domain.c b/xen/common/domain.c
index 8f2bfcae28..53ac1d6c40 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -58,7 +58,7 @@ bool opt_dom0_vcpus_pin;
 boolean_param("dom0_vcpus_pin", opt_dom0_vcpus_pin);
 
 /* Protect updates/reads (resp.) of domain_list and domain_hash. */
-DEFINE_SPINLOCK(domlist_update_lock);
+static DEFINE_SPINLOCK(domlist_update_lock);
 DEFINE_RCU_READ_LOCK(domlist_read_lock);
 
 #define DOMAIN_HASH_SIZE 256
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 91f6db7a32..011292e9f7 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -697,8 +697,10 @@ static inline unsigned int domain_tot_pages(const struct 
domain *d)
     return d->tot_pages - d->extra_pages;
 }
 
-/* Protect updates/reads (resp.) of domain_list and domain_hash. */
-extern spinlock_t domlist_update_lock;
+/*
+ * Protect updates/reads (resp.) of domain_list and domain_hash, together with
+ * domlist_update_lock.
+ */
 extern rcu_read_lock_t domlist_read_lock;
 
 extern struct vcpu *idle_vcpu[NR_CPUS];
--
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