LinuxKPI workqueue cleanup.

This change makes the workqueue implementation behave more like in
Linux, both functionality wise and structure wise.

All workqueue code has been moved to linux_work.c

Add an atomic based statemachine to the work_struct to ensure proper
operation. Prior to this change struct_work was directly mapped to a
FreeBSD task. When a taskqueue has multiple threads the same task may
end up being executed on more than one worker thread simultaneously.
This might cause problems with code coming from Linux, which expects
serial behaviour, similar to Linux tasklets.

Move all global workqueue function names into the linux_xxx domain to
avoid symbol name clashes in the future.

Implement a few more workqueue related functions and macros.

Create two multithreaded taskqueues for the LinuxKPI during module
load, one for time-consuming callbacks and one for non-time consuming
callbacks.

MFC after:		1 week
Sponsored by:		Mellanox Technologies

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/modules/linuxkpi/Makefile b/sys/modules/linuxkpi/Makefile
index 1e87aefe31f0..e9e644964985 100644
--- a/sys/modules/linuxkpi/Makefile
+++ b/sys/modules/linuxkpi/Makefile
@@ -12,7 +12,8 @@ SRCS=	linux_kmod.c \
 	linux_rcu.c \
 	linux_tasklet.c \
 	linux_idr.c \
-	linux_usb.c
+	linux_usb.c \
+	linux_work.c
 
 SRCS+=	bus_if.h \
 	device_if.h \