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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-31 13:37:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-31 13:37:28 -0700
commitff2620f778b1942eea40bd43773094dbc0e76c7e (patch)
tree8f2aafbbdc2139380b1a166942c7ec7ea597a14a /include
parent3dcc4c7d422ce5f2887a021190234a683f8f8cb1 (diff)
parent1ad0f0a7aa1bf3bd42dcd108a96713d255eacd9f (diff)
downloadlinux-ff2620f778b1942eea40bd43773094dbc0e76c7e.tar.bz2
Merge branch 'for-4.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
Pull workqueue fixes from Tejun Heo: "Two notable fixes. - While adding NUMA affinity support to unbound workqueues, the assumption that an unbound workqueue with max_active == 1 is ordered was broken. The plan was to use explicit alloc_ordered_workqueue() for those cases. Unfortunately, I forgot to update the documentation properly and we grew a handful of use cases which depend on that assumption. While we want to convert them to alloc_ordered_workqueue(), we don't really lose anything by enforcing ordered execution on unbound max_active == 1 workqueues and it doesn't make sense to risk subtle bugs. Restore the assumption. - Workqueue assumes that CPU <-> NUMA node mapping remains static. This is a general assumption - we don't have any synchronization mechanism around CPU <-> node mapping. Unfortunately, powerpc may change the mapping dynamically leading to crashes. Michael added a workaround so that we at least don't crash while powerpc hotplug code gets updated" * 'for-4.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: workqueue: Work around edge cases for calc of pool's cpumask workqueue: implicit ordered attribute should be overridable workqueue: restore WQ_UNBOUND/max_active==1 to be ordered
Diffstat (limited to 'include')
-rw-r--r--include/linux/workqueue.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index c102ef65cb64..db6dc9dc0482 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -323,6 +323,7 @@ enum {
__WQ_DRAINING = 1 << 16, /* internal: workqueue is draining */
__WQ_ORDERED = 1 << 17, /* internal: workqueue is ordered */
+ __WQ_ORDERED_EXPLICIT = 1 << 18, /* internal: alloc_ordered_workqueue() */
__WQ_LEGACY = 1 << 18, /* internal: create*_workqueue() */
WQ_MAX_ACTIVE = 512, /* I like 512, better ideas? */
@@ -422,7 +423,8 @@ __alloc_workqueue_key(const char *fmt, unsigned int flags, int max_active,
* Pointer to the allocated workqueue on success, %NULL on failure.
*/
#define alloc_ordered_workqueue(fmt, flags, args...) \
- alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | (flags), 1, ##args)
+ alloc_workqueue(fmt, WQ_UNBOUND | __WQ_ORDERED | \
+ __WQ_ORDERED_EXPLICIT | (flags), 1, ##args)
#define create_workqueue(name) \
alloc_workqueue("%s", __WQ_LEGACY | WQ_MEM_RECLAIM, 1, (name))