[Xen-changelog] [xen master] spinlock: use local_irq_disable() instead of local_irq_save() where possible

[patchbot@xxxxxxx]

commit 2e9869028ab80f13da79517d4572b5d6044ac228
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Jan 9 17:30:32 2015 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Jan 9 17:30:32 2015 +0100

    spinlock: use local_irq_disable() instead of local_irq_save() where possible
    
    ... as generally being a cheaper operation.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Tim Deegan <tim@xxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/common/spinlock.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/common/spinlock.c b/xen/common/spinlock.c
index f9f19a8..13340a3 100644
--- a/xen/common/spinlock.c
+++ b/xen/common/spinlock.c
@@ -162,7 +162,7 @@ unsigned long _spin_lock_irqsave(spinlock_t *lock)
         local_irq_restore(flags);
         while ( likely(_raw_spin_is_locked(&lock->raw)) )
             cpu_relax();
-        local_irq_save(flags);
+        local_irq_disable();
     }
     LOCK_PROFILE_GOT;
     preempt_disable();
@@ -313,7 +313,7 @@ unsigned long _read_lock_irqsave(rwlock_t *lock)
             local_irq_restore(flags);
             while ( (x = lock->lock) & RW_WRITE_FLAG )
                 cpu_relax();
-            local_irq_save(flags);
+            local_irq_disable();
         }
     } while ( cmpxchg(&lock->lock, x, x+1) != x );
     preempt_disable();
@@ -409,7 +409,7 @@ unsigned long _write_lock_irqsave(rwlock_t *lock)
             local_irq_restore(flags);
             while ( (x = lock->lock) & RW_WRITE_FLAG )
                 cpu_relax();
-            local_irq_save(flags);
+            local_irq_disable();
         }
     } while ( cmpxchg(&lock->lock, x, x|RW_WRITE_FLAG) != x );
     while ( x != 0 )
--
generated by git-patchbot for /home/xen/git/xen.git#master

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