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326172d854
mirror_zfs/include/sys
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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
2015-12-11 16:19:56 -08:00
..
fm Kernel header installation should respect --prefix 2014-10-28 09:31:48 -07:00
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 Refresh links to web site 2013-03-04 19:09:34 -08:00
acl.h Refresh links to web site 2013-03-04 19:09:34 -08:00
atomic.h Remove atomic64_xchg() wrappers 2014-10-17 15:11:50 -07:00
attr.h Refresh links to web site 2013-03-04 19:09:34 -08:00
bitmap.h Refresh links to web site 2013-03-04 19:09:34 -08:00
bootconf.h Refresh links to web site 2013-03-04 19:09:34 -08:00
bootprops.h Refresh links to web site 2013-03-04 19:09:34 -08:00
buf.h Refresh links to web site 2013-03-04 19:09:34 -08:00
byteorder.h Refresh links to web site 2013-03-04 19:09:34 -08:00
callb.h Refresh links to web site 2013-03-04 19:09:34 -08:00
callo.h Emulate illumos interface cv_timedwait_hires() 2013-11-04 09:49:24 -08:00
cmn_err.h Refresh links to web site 2013-03-04 19:09:34 -08:00
compress.h Refresh links to web site 2013-03-04 19:09:34 -08:00
condvar.h Rename cv_wait_interruptible() to cv_wait_sig() 2015-06-10 16:36:12 -07:00
conf.h Refresh links to web site 2013-03-04 19:09:34 -08:00
console.h Refresh links to web site 2013-03-04 19:09:34 -08:00
cpupart.h Refresh links to web site 2013-03-04 19:09:34 -08:00
cpuvar.h Refresh links to web site 2013-03-04 19:09:34 -08:00
crc32.h Refresh links to web site 2013-03-04 19:09:34 -08:00
cred.h Remove credential configure checks. 2014-10-17 15:11:51 -07:00
ctype.h Refresh links to web site 2013-03-04 19:09:34 -08:00
ddi.h Refresh links to web site 2013-03-04 19:09:34 -08:00
debug.h Add IMPLY() and EQUIV() macros 2015-06-24 14:44:47 -07:00
dirent.h Refresh links to web site 2013-03-04 19:09:34 -08:00
disp.h Add kpreempt() compatibility macro 2013-10-09 13:52:55 -07:00
dkio.h Additional dkio support for TRIM/Discard 2015-12-02 13:44:35 -08:00
dkioc_free_util.h Additional dkio support for TRIM/Discard 2015-12-02 13:44:35 -08:00
dklabel.h Refresh links to web site 2013-03-04 19:09:34 -08:00
dnlc.h Remove shrink_{i,d}node_cache() wrappers 2014-10-17 15:11:51 -07:00
dumphdr.h Refresh links to web site 2013-03-04 19:09:34 -08:00
efi_partition.h Refresh links to web site 2013-03-04 19:09:34 -08:00
errno.h Refresh links to web site 2013-03-04 19:09:34 -08:00
extdirent.h Refresh links to web site 2013-03-04 19:09:34 -08:00
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file.h Refresh links to web site 2013-03-04 19:09:34 -08:00
idmap.h Refresh links to web site 2013-03-04 19:09:34 -08:00
int_limits.h Refresh links to web site 2013-03-04 19:09:34 -08:00
int_types.h Refresh links to web site 2013-03-04 19:09:34 -08:00
inttypes.h Refresh links to web site 2013-03-04 19:09:34 -08:00
isa_defs.h Either _ILP32 or _LP64 must be defined 2015-12-10 11:53:29 -08:00
kidmap.h Refresh links to web site 2013-03-04 19:09:34 -08:00
kmem_cache.h Fix CPU hotplug 2015-10-13 09:50:40 -07:00
kmem.h Add hooks for disabling direct reclaim 2015-01-16 13:55:09 -08:00
kobj.h Refresh links to web site 2013-03-04 19:09:34 -08:00
kstat.h 3537 add kstat_waitq_enter and friends 2013-10-25 13:41:52 -07:00
list.h Refresh links to web site 2013-03-04 19:09:34 -08:00
Makefile.am Additional dkio support for TRIM/Discard 2015-12-02 13:44:35 -08:00
mkdev.h Refresh links to web site 2013-03-04 19:09:34 -08:00
mntent.h Refresh links to web site 2013-03-04 19:09:34 -08:00
modctl.h Refresh links to web site 2013-03-04 19:09:34 -08:00
mode.h Refresh links to web site 2013-03-04 19:09:34 -08:00
mount.h Refresh links to web site 2013-03-04 19:09:34 -08:00
mutex.h Add new lock types MUTEX_NOLOCKDEP, and RW_NOLOCKDEP 2015-12-11 16:18:54 -08:00
note.h Refresh links to web site 2013-03-04 19:09:34 -08:00
open.h Refresh links to web site 2013-03-04 19:09:34 -08:00
param.h Refresh links to web site 2013-03-04 19:09:34 -08:00
pathname.h Refresh links to web site 2013-03-04 19:09:34 -08:00
policy.h Refresh links to web site 2013-03-04 19:09:34 -08:00
pool.h Refresh links to web site 2013-03-04 19:09:34 -08:00
priv_impl.h Refresh links to web site 2013-03-04 19:09:34 -08:00
proc.h Refresh links to web site 2013-03-04 19:09:34 -08:00
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pset.h Refresh links to web site 2013-03-04 19:09:34 -08:00
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refstr.h Refresh links to web site 2013-03-04 19:09:34 -08:00
resource.h Refresh links to web site 2013-03-04 19:09:34 -08:00
rwlock.h Add new lock types MUTEX_NOLOCKDEP, and RW_NOLOCKDEP 2015-12-11 16:18:54 -08:00
sdt.h Define SET_ERROR() 2013-10-09 14:20:46 -07:00
sid.h Refresh links to web site 2013-03-04 19:09:34 -08:00
signal.h Refresh links to web site 2013-03-04 19:09:34 -08:00
stat.h Refresh links to web site 2013-03-04 19:09:34 -08:00
stropts.h Refresh links to web site 2013-03-04 19:09:34 -08:00
sunddi.h Update code to use misc_register()/misc_deregister() 2014-10-17 15:07:28 -07:00
sunldi.h Refresh links to web site 2013-03-04 19:09:34 -08:00
sysdc.h Refresh links to web site 2013-03-04 19:09:34 -08:00
sysevent.h Refresh links to web site 2013-03-04 19:09:34 -08:00
sysmacros.h sysmacros: Make P2ROUNDUP not trigger int overflow 2015-11-13 15:21:52 -08:00
systeminfo.h Simplify hostid logic 2014-04-14 09:04:41 -07:00
systm.h Refresh links to web site 2013-03-04 19:09:34 -08:00
t_lock.h Refresh links to web site 2013-03-04 19:09:34 -08:00
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 2015-12-11 15:27:53 -08:00
timer.h Add ddi_time_after and friends 2014-04-14 09:32:01 -07:00
tsd.h Refresh links to web site 2013-03-04 19:09:34 -08:00
types32.h Refresh links to web site 2013-03-04 19:09:34 -08:00
types.h Refactor existing code 2015-01-16 13:55:08 -08:00
u8_textprep.h Refresh links to web site 2013-03-04 19:09:34 -08:00
uio.h Restructure uio to accommodate bio_vec 2015-08-24 10:10:21 -07:00
unistd.h Refresh links to web site 2013-03-04 19:09:34 -08:00
user.h Fix race between getf() and areleasef() 2015-12-03 15:44:47 -08:00
va_list.h Refresh links to web site 2013-03-04 19:09:34 -08:00
varargs.h Refresh links to web site 2013-03-04 19:09:34 -08:00
vfs_opreg.h Refresh links to web site 2013-03-04 19:09:34 -08:00
vfs.h Refresh links to web site 2013-03-04 19:09:34 -08:00
vmem.h Add memory compatibility wrappers 2015-06-29 09:26:29 -07:00
vmsystm.h Include other sources of freeable memory in the freemem calculation 2015-08-19 09:25:30 -07:00
vnode.h Implement areleasef() 2015-04-24 13:02:37 -07:00
zmod.h Refresh links to web site 2013-03-04 19:09:34 -08:00
zone.h Add crgetzoneid() stub 2015-04-02 09:49:55 -07:00