From ef1b78ba49fdb1055c8d999e5efee8b6ce660d6c Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bvanassche@acm.org>
Date: Tue, 2 Apr 2019 04:09:54 +0000
Subject: [PATCH] scst/include/backport.h: Add an alloc_workqueue() backport

git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@8130 d57e44dd-8a1f-0410-8b47-8ef2f437770f
---
 scst/include/backport.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/scst/include/backport.h b/scst/include/backport.h
index 9c636c5a5..576d7d65b 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -37,6 +37,7 @@
 #include <linux/stddef.h>	/* sizeof_field() */
 #include <linux/timer.h>
 #include <linux/vmalloc.h>
+#include <linux/workqueue.h>
 #include <linux/writeback.h>	/* sync_page_range() */
 #include <rdma/ib_verbs.h>
 #include <scsi/scsi_cmnd.h>	/* struct scsi_cmnd */
@@ -1456,6 +1457,22 @@ static inline void *vzalloc(unsigned long size)
 }
 #endif
 
+/* <linux/workqueue.h> */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
+/*
+ * See also commit d320c03830b1 ("workqueue: s/__create_workqueue()/
+ * alloc_workqueue()/, and add system workqueues") # v2.6.36.
+ */
+static inline struct workqueue_struct *alloc_workqueue(const char *fmt,
+						       unsigned int flags,
+						       int max_active, ...)
+{
+	WARN_ON_ONCE(flags | max_active);
+	return create_workqueue(fmt);
+}
+#endif
+
 /* <scsi/scsi_cmnd.h> */
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 24) || \