workqueue: skip the node_nr_active update for non-unbound workqueuesgrafted

apply_wqattrs_commit() updates node_nr_active->max unconditionally.
wq->node_nr_active[] is only allocated for unbound workqueues, so guard
the call before per-cpu workqueues start using this path.

No functional change: only unbound workqueues reach apply_wqattrs_*()
today.

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 75 insertions, 0 deletions

diff --git a/arch/parisc/lib/bitops.c b/arch/parisc/lib/bitops.c
new file mode 100644
index 000000000..9df810050
--- /dev/null
+++ b/arch/parisc/lib/bitops.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * bitops.c: atomic operations which got too long to be inlined all over
+ *      the place.
+ * 
+ * Copyright 1999 Philipp Rumpf (prumpf@tux.org)
+ * Copyright 2000 Grant Grundler (grundler@cup.hp.com)
+ */
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/atomic.h>
+
+#ifdef CONFIG_SMP
+arch_spinlock_t __atomic_hash[ATOMIC_HASH_SIZE] __lock_aligned = {
+	[0 ... (ATOMIC_HASH_SIZE-1)]  = __ARCH_SPIN_LOCK_UNLOCKED
+};
+#endif
+
+#ifdef CONFIG_64BIT
+unsigned long notrace __xchg64(unsigned long x, volatile unsigned long *ptr)
+{
+	unsigned long temp, flags;
+
+	_atomic_spin_lock_irqsave(ptr, flags);
+	temp = *ptr;
+	*ptr = x;
+	_atomic_spin_unlock_irqrestore(ptr, flags);
+	return temp;
+}
+#endif
+
+unsigned long notrace __xchg32(int x, volatile int *ptr)
+{
+	unsigned long flags;
+	long temp;
+
+	_atomic_spin_lock_irqsave(ptr, flags);
+	temp = (long) *ptr;	/* XXX - sign extension wanted? */
+	*ptr = x;
+	_atomic_spin_unlock_irqrestore(ptr, flags);
+	return (unsigned long)temp;
+}
+
+
+unsigned long notrace __xchg8(char x, volatile char *ptr)
+{
+	unsigned long flags;
+	long temp;
+
+	_atomic_spin_lock_irqsave(ptr, flags);
+	temp = (long) *ptr;	/* XXX - sign extension wanted? */
+	*ptr = x;
+	_atomic_spin_unlock_irqrestore(ptr, flags);
+	return (unsigned long)temp;
+}
+
+
+#define CMPXCHG(T)						\
+	T notrace __cmpxchg_##T(volatile T *ptr, T old, T new)	\
+	{							\
+		unsigned long flags;				\
+		T prev;						\
+								\
+		_atomic_spin_lock_irqsave(ptr, flags);		\
+		if ((prev = *ptr) == old)			\
+			*ptr = new;				\
+		_atomic_spin_unlock_irqrestore(ptr, flags);	\
+		return prev;					\
+	}
+
+CMPXCHG(u64)
+CMPXCHG(u32)
+CMPXCHG(u16)
+CMPXCHG(u8)