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, 64 insertions, 0 deletions

diff --git a/arch/sh/mm/cache-j2.c b/arch/sh/mm/cache-j2.c
new file mode 100644
index 000000000..9ac960214
--- /dev/null
+++ b/arch/sh/mm/cache-j2.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch/sh/mm/cache-j2.c
+ *
+ * Copyright (C) 2015-2016 Smart Energy Instruments, Inc.
+ */
+
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/cpumask.h>
+
+#include <asm/cache.h>
+#include <asm/addrspace.h>
+#include <asm/processor.h>
+#include <asm/cacheflush.h>
+#include <asm/io.h>
+
+#define ICACHE_ENABLE	0x1
+#define DCACHE_ENABLE	0x2
+#define CACHE_ENABLE	(ICACHE_ENABLE | DCACHE_ENABLE)
+#define ICACHE_FLUSH	0x100
+#define DCACHE_FLUSH	0x200
+#define CACHE_FLUSH	(ICACHE_FLUSH | DCACHE_FLUSH)
+
+u32 __iomem *j2_ccr_base;
+
+static void j2_flush_icache(void *args)
+{
+	unsigned cpu;
+	for_each_possible_cpu(cpu)
+		__raw_writel(CACHE_ENABLE | ICACHE_FLUSH, j2_ccr_base + cpu);
+}
+
+static void j2_flush_dcache(void *args)
+{
+	unsigned cpu;
+	for_each_possible_cpu(cpu)
+		__raw_writel(CACHE_ENABLE | DCACHE_FLUSH, j2_ccr_base + cpu);
+}
+
+static void j2_flush_both(void *args)
+{
+	unsigned cpu;
+	for_each_possible_cpu(cpu)
+		__raw_writel(CACHE_ENABLE | CACHE_FLUSH, j2_ccr_base + cpu);
+}
+
+void __init j2_cache_init(void)
+{
+	if (!j2_ccr_base)
+		return;
+
+	local_flush_cache_all = j2_flush_both;
+	local_flush_cache_mm = j2_flush_both;
+	local_flush_cache_dup_mm = j2_flush_both;
+	local_flush_cache_page = j2_flush_both;
+	local_flush_cache_range = j2_flush_both;
+	local_flush_dcache_folio = j2_flush_dcache;
+	local_flush_icache_range = j2_flush_icache;
+	local_flush_icache_folio = j2_flush_icache;
+	local_flush_cache_sigtramp = j2_flush_icache;
+
+	pr_info("Initial J2 CCR is %.8x\n", __raw_readl(j2_ccr_base));
+}