[PARISC] futex: Use same lock set as lws calls

In debugging the failure of the glibc tst-cond18 test on parisc, I realized
that futexes need to use the same locks the lws calls.  This fixes all the
pthread 'cond' tests.  Sadly, there are still problems with thread cancellation.

[jejb: checkpatch fixes]
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 27 insertions, 4 deletions

diff --git a/arch/parisc/include/asm/futex.h b/arch/parisc/include/asm/futex.h
index 2388bdb32832..49df14805a9b 100644
--- a/arch/parisc/include/asm/futex.h
+++ b/arch/parisc/include/asm/futex.h
@@ -8,6 +8,29 @@
 #include <asm/atomic.h>
 #include <asm/errno.h>
 
+/* The following has to match the LWS code in syscall.S.  We have
+   sixteen four-word locks. */
+
+static inline void
+_futex_spin_lock_irqsave(u32 __user *uaddr, unsigned long int *flags)
+{
+        extern u32 lws_lock_start[];
+        long index = ((long)uaddr & 0xf0) >> 2;
+        arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index];
+        local_irq_save(*flags);
+        arch_spin_lock(s);
+}
+
+static inline void
+_futex_spin_unlock_irqrestore(u32 __user *uaddr, unsigned long int *flags)
+{
+        extern u32 lws_lock_start[];
+        long index = ((long)uaddr & 0xf0) >> 2;
+        arch_spinlock_t *s = (arch_spinlock_t *)&lws_lock_start[index];
+        arch_spin_unlock(s);
+        local_irq_restore(*flags);
+}
+
 static inline int
 futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
 {
@@ -26,7 +49,7 @@ futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
 
         pagefault_disable();
 
-        _atomic_spin_lock_irqsave(uaddr, flags);
+        _futex_spin_lock_irqsave(uaddr, &flags);
 
         switch (op) {
         case FUTEX_OP_SET:
@@ -71,7 +94,7 @@ futex_atomic_op_inuser (int encoded_op, u32 __user *uaddr)
                 ret = -ENOSYS;
         }
 
-        _atomic_spin_unlock_irqrestore(uaddr, flags);
+        _futex_spin_unlock_irqrestore(uaddr, &flags);
 
         pagefault_enable();
 
@@ -113,7 +136,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
          * address. This should scale to a couple of CPUs.
          */
 
-        _atomic_spin_lock_irqsave(uaddr, flags);
+        _futex_spin_lock_irqsave(uaddr, &flags);
 
         ret = get_user(val, uaddr);
 
@@ -122,7 +145,7 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
 
         *uval = val;
 
-        _atomic_spin_unlock_irqrestore(uaddr, flags);
+        _futex_spin_unlock_irqrestore(uaddr, &flags);
 
         return ret;
 }