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Olaf Faaland 326172d854 Subclass tq_lock to eliminate a lockdep warning 
When taskq_dispatch() calls taskq_thread_spawn() to create a new thread
for a taskq, linux lockdep warns of possible recursive locking.  This is
a false positive.

One such call chain is as follows, when a taskq needs more threads:
	taskq_dispatch->taskq_thread_spawn->taskq_dispatch

The initial taskq_dispatch() holds tq_lock on the taskq that needed more
worker threads.  The later call into taskq_dispatch() takes
dynamic_taskq->tq_lock.  Without subclassing, lockdep believes these
could potentially be the same lock and complains.  A similar case occurs
when taskq_dispatch() then calls task_alloc().

This patch uses spin_lock_irqsave_nested() when taking tq_lock, with one
of two new lock subclasses:

subclass              taskq
TQ_LOCK_DYNAMIC       dynamic_taskq
TQ_LOCK_GENERAL       any other

Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #480
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fm
Kernel header installation should respect --prefix
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fs
Kernel header installation should respect --prefix
2014-10-28 09:31:48 -07:00
sysevent
Kernel header installation should respect --prefix
2014-10-28 09:31:48 -07:00
acl_impl.h
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acl.h
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atomic.h
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attr.h
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bitmap.h
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bootconf.h
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bootprops.h
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buf.h
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byteorder.h
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callb.h
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callo.h
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cmn_err.h
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compress.h
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condvar.h
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conf.h
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console.h
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cpupart.h
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cpuvar.h
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crc32.h
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cred.h
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ctype.h
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ddi.h
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debug.h
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dirent.h
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disp.h
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dkio.h
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dkioc_free_util.h
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dklabel.h
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dnlc.h
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dumphdr.h
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inttypes.h
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isa_defs.h
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kidmap.h
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kmem_cache.h
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kmem.h
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kobj.h
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kstat.h
3537 add kstat_waitq_enter and friends
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list.h
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Makefile.am
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mkdev.h
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mntent.h
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modctl.h
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mode.h
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mount.h
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mutex.h
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note.h
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refstr.h
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resource.h
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rwlock.h
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sdt.h
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sid.h
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signal.h
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stat.h
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stropts.h
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sunddi.h
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sysdc.h
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sysmacros.h
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systeminfo.h
Simplify hostid logic
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systm.h
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t_lock.h
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taskq.h
Subclass tq_lock to eliminate a lockdep warning
2015-12-11 16:19:56 -08:00
thread.h
De-inline spl_kthread_create().
2014-04-09 19:17:12 -07:00
time.h
Fix build issue on some configured kernels
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timer.h
Add ddi_time_after and friends
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tsd.h
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types32.h
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types.h
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uio.h
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unistd.h
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user.h
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varargs.h
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vfs.h
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vmem.h
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vmsystm.h
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vnode.h
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zmod.h
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zone.h
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