@@ -79,7 +79,7 @@ config RISCV
 	select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
 	select ARCH_WANTS_NO_INSTR
 	select ARCH_WANTS_THP_SWAP if HAVE_ARCH_TRANSPARENT_HUGEPAGE
-	select ARCH_WEAK_RELEASE_ACQUIRE if ARCH_USE_QUEUED_SPINLOCKS
+	select ARCH_WEAK_RELEASE_ACQUIRE
 	select BINFMT_FLAT_NO_DATA_START_OFFSET if !MMU
 	select BUILDTIME_TABLE_SORT if MMU
 	select CLINT_TIMER if RISCV_M_MODE

@@ -13,10 +13,8 @@
  * about this. If your architecture cannot do this you might be better off with
  * a test-and-set.
  *
- * It further assumes atomic_*_release() + atomic_*_acquire() is RCpc and hence
- * uses atomic_fetch_add() which is RCsc to create an RCsc hot path, along with
- * a full fence after the spin to upgrade the otherwise-RCpc
- * atomic_cond_read_acquire().
+ * It further assumes atomic_*_release() + atomic_*_acquire() is RCtso, where
+ * regular code only expects atomic_t to be RCpc.
  *
  * The implementation uses smp_cond_load_acquire() to spin, so if the
  * architecture has WFE like instructions to sleep instead of poll for word

@@ -32,22 +30,13 @@
 
 static __always_inline void ticket_spin_lock(arch_spinlock_t *lock)
 {
-	u32 val = atomic_fetch_add(1<<16, &lock->val);
+	u32 val = atomic_fetch_add_acquire(1<<16, &lock->val);
 	u16 ticket = val >> 16;
 
 	if (ticket == (u16)val)
 		return;
 
-	/*
-	 * atomic_cond_read_acquire() is RCpc, but rather than defining a
-	 * custom cond_read_rcsc() here we just emit a full fence.  We only
-	 * need the prior reads before subsequent writes ordering from
-	 * smb_mb(), but as atomic_cond_read_acquire() just emits reads and we
-	 * have no outstanding writes due to the atomic_fetch_add() the extra
-	 * orderings are free.
-	 */
 	atomic_cond_read_acquire(&lock->val, ticket == (u16)VAL);
-	smp_mb();
 }
 
 static __always_inline bool ticket_spin_trylock(arch_spinlock_t *lock)

@@ -57,7 +46,7 @@ static __always_inline bool ticket_spin_trylock(arch_spinlock_t *lock)
 	if ((old >> 16) != (old & 0xffff))
 		return false;
 
-	return atomic_try_cmpxchg(&lock->val, &old, old + (1<<16)); /* SC, for RCsc */
+	return atomic_try_cmpxchg_acquire(&lock->val, &old, old + (1<<16));
 }
 
 static __always_inline void ticket_spin_unlock(arch_spinlock_t *lock)