[IA64] Optimize ticket spinlocks in fsys_rt_sigprocmask
Tony's fix (f574c843191728d9407b766a027f779dcd27b272) has a small bug,
it incorrectly uses "r3" as a scratch register in the first of the two
unlock paths ... it is also inefficient. Optimize the fast path again.
Signed-off-by: Petr Tesarik <ptesarik@suse.cz>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S
index 471a1e7..331d42b 100644
--- a/arch/ia64/kernel/fsys.S
+++ b/arch/ia64/kernel/fsys.S
@@ -420,34 +420,31 @@
;;
RSM_PSR_I(p0, r18, r19) // mask interrupt delivery
- mov ar.ccv=0
andcm r14=r14,r17 // filter out SIGKILL & SIGSTOP
+ mov r8=EINVAL // default to EINVAL
#ifdef CONFIG_SMP
// __ticket_spin_trylock(r31)
ld4 r17=[r31]
- mov r8=EINVAL // default to EINVAL
;;
- extr r9=r17,17,15
- ;;
- xor r18=r17,r9
- adds r19=1,r17
- ;;
- extr.u r18=r18,0,15
- ;;
- cmp.eq p0,p7=0,r18
-(p7) br.cond.spnt.many .lock_contention
mov.m ar.ccv=r17
+ extr.u r9=r17,17,15
+ adds r19=1,r17
+ extr.u r18=r17,0,15
;;
- cmpxchg4.acq r9=[r31],r19,ar.ccv
+ cmp.eq p6,p7=r9,r18
+ ;;
+(p6) cmpxchg4.acq r9=[r31],r19,ar.ccv
+(p6) dep.z r20=r19,1,15 // next serving ticket for unlock
+(p7) br.cond.spnt.many .lock_contention
;;
cmp4.eq p0,p7=r9,r17
+ adds r31=2,r31
(p7) br.cond.spnt.many .lock_contention
ld8 r3=[r2] // re-read current->blocked now that we hold the lock
;;
#else
ld8 r3=[r2] // re-read current->blocked now that we hold the lock
- mov r8=EINVAL // default to EINVAL
#endif
add r18=IA64_TASK_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r16
add r19=IA64_TASK_SIGNAL_OFFSET,r16
@@ -503,16 +500,8 @@
#ifdef CONFIG_SMP
// __ticket_spin_unlock(r31)
- adds r31=2,r31
- ;;
- ld2.bias r2=[r31]
- mov r3=65534
- ;;
- adds r2=2,r2
- ;;
- and r3=r3,r2
- ;;
- st2.rel [r31]=r3
+ st2.rel [r31]=r20
+ mov r20=0 // i must not leak kernel bits...
#endif
SSM_PSR_I(p0, p9, r31)
;;
@@ -535,16 +524,7 @@
.sig_pending:
#ifdef CONFIG_SMP
// __ticket_spin_unlock(r31)
- adds r31=2,r31
- ;;
- ld2.bias r2=[r31]
- mov r3=65534
- ;;
- adds r2=2,r2
- ;;
- and r3=r3,r2
- ;;
- st2.rel [r31]=r3
+ st2.rel [r31]=r20 // release the lock
#endif
SSM_PSR_I(p0, p9, r17)
;;