[Xen-changelog] [xen master] spinlock: fix build with older GCC

[patchbot@xxxxxxx]

commit 1037e33c88bb0e1fe530c164f242df17030102e1
Author:     David Vrabel <david.vrabel@xxxxxxxxxx>
AuthorDate: Tue May 19 15:49:22 2015 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue May 19 15:49:22 2015 +0200

    spinlock: fix build with older GCC
    
    Older GCC versions such as 4.3 cannot have initializers for the
    members of anonymous structures, so initialize .head_tail instead.
    
    Use a SPINLOCK_TICKET_INC define so this initializer is near the
    spinlock_tickets_t definition (in case the structure changes requiring
    changes to the initializer).
    
    Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
    Reported-and-tested-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/common/spinlock.c      |    2 +-
 xen/include/xen/spinlock.h |    2 ++
 2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/xen/common/spinlock.c b/xen/common/spinlock.c
index c8dc8ba..29149d1 100644
--- a/xen/common/spinlock.c
+++ b/xen/common/spinlock.c
@@ -132,7 +132,7 @@ static always_inline u16 observe_head(spinlock_tickets_t *t)
 
 void _spin_lock(spinlock_t *lock)
 {
-    spinlock_tickets_t tickets = { .tail = 1, };
+    spinlock_tickets_t tickets = SPINLOCK_TICKET_INC;
     LOCK_PROFILE_VAR;
 
     check_lock(&lock->debug);
diff --git a/xen/include/xen/spinlock.h b/xen/include/xen/spinlock.h
index 311685a..9286543 100644
--- a/xen/include/xen/spinlock.h
+++ b/xen/include/xen/spinlock.h
@@ -132,6 +132,8 @@ typedef union {
     };
 } spinlock_tickets_t;
 
+#define SPINLOCK_TICKET_INC { .head_tail = 0x10000, }
+
 typedef struct spinlock {
     spinlock_tickets_t tickets;
     u16 recurse_cpu:12;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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