[PATCH] x86: eliminate TICKET_MASK

[Jan Beulich]

The definition of it being questionable already (unnecessarily
including a cast), and it being used in a single place that can be
written shorter without it, remove this #define.

Along the same lines, simplify __ticket_spin_is_locked()'s main
expression, which was the more convoluted way because of needs that
went away with the recent type changes by Jeremy.

This is pure cleanup, no functional change intended.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>

---
 arch/x86/include/asm/spinlock.h       |    4 ++--
 arch/x86/include/asm/spinlock_types.h |    1 -
 2 files changed, 2 insertions(+), 3 deletions(-)

--- 3.3-rc2/arch/x86/include/asm/spinlock.h
+++ 3.3-rc2-x86-ticket-mask/arch/x86/include/asm/spinlock.h
@@ -88,14 +88,14 @@ static inline int __ticket_spin_is_locke
 {
 	struct __raw_tickets tmp = ACCESS_ONCE(lock->tickets);
 
-	return !!(tmp.tail ^ tmp.head);
+	return tmp.tail != tmp.head;
 }
 
 static inline int __ticket_spin_is_contended(arch_spinlock_t *lock)
 {
 	struct __raw_tickets tmp = ACCESS_ONCE(lock->tickets);
 
-	return ((tmp.tail - tmp.head) & TICKET_MASK) > 1;
+	return (__ticket_t)(tmp.tail - tmp.head) > 1;
 }
 
 #ifndef CONFIG_PARAVIRT_SPINLOCKS
--- 3.3-rc2/arch/x86/include/asm/spinlock_types.h
+++ 3.3-rc2-x86-ticket-mask/arch/x86/include/asm/spinlock_types.h
@@ -16,7 +16,6 @@ typedef u32 __ticketpair_t;
 #endif
 
 #define TICKET_SHIFT	(sizeof(__ticket_t) * 8)
-#define TICKET_MASK	((__ticket_t)((1 << TICKET_SHIFT) - 1))
 
 typedef struct arch_spinlock {
 	union {



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/