fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / include / linux / seqlock.h

diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index fca9b0f..6b0648c 100644 (file)
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -26,7 +26,6 @@
  * by Keith Owens and Andrea Arcangeli
  */
 
-#include <linux/config.h>
 #include <linux/spinlock.h>
 #include <linux/preempt.h>
 
@@ -39,9 +38,20 @@ typedef struct {
  * These macros triggered gcc-3.x compile-time problems.  We think these are
  * OK now.  Be cautious.
  */
-#define SEQLOCK_UNLOCKED { 0, SPIN_LOCK_UNLOCKED }
-#define seqlock_init(x)        do { *(x) = (seqlock_t) SEQLOCK_UNLOCKED; } while (0)
+#define __SEQLOCK_UNLOCKED(lockname) \
+                { 0, __SPIN_LOCK_UNLOCKED(lockname) }
 
+#define SEQLOCK_UNLOCKED \
+                __SEQLOCK_UNLOCKED(old_style_seqlock_init)
+
+#define seqlock_init(x)                                        \
+       do {                                            \
+               (x)->sequence = 0;                      \
+               spin_lock_init(&(x)->lock);             \
+       } while (0)
+
+#define DEFINE_SEQLOCK(x) \
+               seqlock_t x = __SEQLOCK_UNLOCKED(x)
 
 /* Lock out other writers and update the count.
  * Acts like a normal spin_lock/unlock.
@@ -73,7 +83,7 @@ static inline int write_tryseqlock(seqlock_t *sl)
 }
 
 /* Start of read calculation -- fetch last complete writer token */
-static inline unsigned read_seqbegin(const seqlock_t *sl)
+static __always_inline unsigned read_seqbegin(const seqlock_t *sl)
 {
        unsigned ret = sl->sequence;
        smp_rmb();
@@ -88,7 +98,7 @@ static inline unsigned read_seqbegin(const seqlock_t *sl)
  *    
  * Using xor saves one conditional branch.
  */
-static inline int read_seqretry(const seqlock_t *sl, unsigned iv)
+static __always_inline int read_seqretry(const seqlock_t *sl, unsigned iv)
 {
        smp_rmb();
        return (iv & 1) | (sl->sequence ^ iv);